Relevant bibliographies by topics / Terahertz pulses

Academic literature on the topic 'Terahertz pulses'

Author: Grafiati
Published: 22 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Terahertz pulses":

1

Petrov, Nikolai I. "Dispersive Propagation of Terahertz Pulses in a Plasmonic Fiber." Fibers 11, no. 7 (July 14, 2023): 62. http://dx.doi.org/10.3390/fib11070062.

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The dispersion properties of surface plasmon polaritons (SPPs) during propagation on metal wires with a dielectric coating in the terahertz frequency range were investigated theoretically. An analytical expression was obtained for a pulsed electric field using the solution of Maxwell equations taking into account high-order dispersion terms. The influence of the dielectric coating on the distortion of the pulse shape was investigated. Unlike uncoated wire, the propagation of surface plasmon pulses along a coated wire is highly dispersive. It was shown that the coating leads to the appearance of a long-chirped signal with a propagation of only a few millimeters, i.e., when a terahertz pulse propagates along a coated wire, it acquires a long oscillatory tail, the frequency of which depends on time.
2

Архипов, Р. М., and Н. Н. Розанов. "Генерация предельно коротких импульсов терагерцового излучения на основе сверхизлучения трехуровневой резонансной среды." Оптика и спектроскопия 129, no. 3 (2021): 319. http://dx.doi.org/10.21883/os.2021.03.50659.274-20.

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The possibility of generating extremely short pulses of terahertz (THz) radiation due to superradiance - collective spontaneous emission of stopped polarization of a thin layer of a three-level resonant medium excited by a pair of attosecond (or femtosecond) pulses is studied theoretically. The source of a terahertz pulse is a pulse of stopped nonlinear polarization of the medium, which occurs in the interval between its excitation and de-excitation. The case of a three-level medium with equidistant energy levels (as in a quantum harmonic oscillator), the transition frequency of which lies in the THz range, is considered. The influence of the populations of the excited levels of the medium on the shape of the terahertz superradiance pulse is discussed.
3

Wynne, Klaas, and Dino A. Jaroszynski. "Superluminal terahertz pulses." Optics Letters 24, no. 1 (January 1, 1999): 25. http://dx.doi.org/10.1364/ol.24.000025.

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4

Sazonov, S. V., and N. V. Ustinov. "New Soliton Regime of Generation of Broadband Terahertz Radiation by Laser Pulses with Tilted Wave Fronts." JETP Letters 118, no. 6 (September 2023): 408–13. http://dx.doi.org/10.1134/s0021364023602531.

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A new soliton-like regime of generation of terahertz radiation by optical pulses with tilted wave fronts is analyzed. It has been shown that the diffraction of an optical pulse is of fundamental importance for the formation of optical–terahertz soliton. A nonsoliton broadband terahertz component is generated synchronously with the soliton component of radiation. Two matching conditions called “super-Cherenkov” and “anti-Cherenkov” have been revealed under which generation is the most efficient. In the former and latter cases, the optical terahertz soliton propagates ahead and behind the nonsoliton terahertz component, respectively.
5

Seifert, Tom S., Liang Cheng, Zhengxing Wei, Tobias Kampfrath, and Jingbo Qi. "Spintronic sources of ultrashort terahertz electromagnetic pulses." Applied Physics Letters 120, no. 18 (May 2, 2022): 180401. http://dx.doi.org/10.1063/5.0080357.

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Spintronic terahertz emitters are broadband and efficient sources of terahertz radiation, which emerged at the intersection of ultrafast spintronics and terahertz photonics. They are based on efficient spin-current generation, spin-to-charge-current conversion, and current-to-field conversion at terahertz rates. In this Editorial, we review the recent developments and applications, the current understanding of the physical processes, and the future challenges and perspectives of broadband spintronic terahertz emitters.
6

Arkhipov M. V., Arkhipov R. M., and Rosanov N. N. "Generation of unipolar pulses of terahertz radiation with a large electric area." Optics and Spectroscopy 130, no. 8 (2022): 980. http://dx.doi.org/10.21883/eos.2022.08.54771.3703-22.

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A physical situation is proposed and theoretically analyzed, in which, in our opinion, it is possible to generate unipolar terahertz pulses with a large electric area. In this case, the gas in the tube is excited by a femtosecond IR laser pulse. In this case, the tube with gas is placed in a constant external electric field. The generation of a unipolar pulse is based on "three-step scheme" --- ionization of gas atoms by a femtosecond pulse, subsequent acceleration of a free electron in a dc external field and subsequent annihilation of an electron upon collision with a tube wall or another atom (ion). Keywords: unipolar pulses, ultrafast optics, electric pulse area, terahertz radiation, three-step model.
7

Burmistrov E. R. and Avakyants L. P. "Determination of 2DEG parameters in LED heterostructures with three quantum wells In-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-N/GaN by terahertz time-domain spectroscopy (THz-TDs)." Physics of the Solid State 65, no. 2 (2023): 179. http://dx.doi.org/10.21883/pss.2023.02.55399.503.

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Terahertz time-domain spectroscopy (THz-TDs) has been used to record the resonant frequencies of plasmon oscillations excited in samples of heterostructures with three InxGa1-xN/GaN quantum wells (QWs) by laser pulses with a duration of 130 fs in the temperature range from 90 to 170 K. Fast Fourier transform (FFT) of the time dependence of the electric field of THz-pulses made it possible to obtain the frequency spectra of the power and phase shift of THz-radiation, the interpretation of which made it possible to estimate the pulse relaxation time, mobility and effective mass of two-dimensional electron gas (2DEG) in the heterostructures. Using a series of frequency spectra of the power and phase shift of THz-radiation, the temperature dependences of the effective mass and relaxation time of the 2DEG pulse were obtained. Mobility value 2DEG obtained by the THz-TDs is in good agreement with the data of Hall measurements. Keywords: heterostructures, pulse relaxation time, 2DEG, terahertz radiation, terahertz spectroscopy.
8

Чефонов, О. В., А. В. Овчинников, С. А. Евлашин, and М. Б. Агранат. "Деградация и разрушение тонких стальных пленок при многократном воздействии сверхкоротких импульсов THz-излучения." Письма в журнал технической физики 45, no. 11 (2019): 41. http://dx.doi.org/10.21883/pjtf.2019.11.47824.17775.

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The investigations upon destruction of thin stainless films under the action of ultrashort pulses of directional terahertz radiation are carried out. The terahertz pulse with duration within several picoseconds in fact simulates non-resonance action on matter of quasi-dc electric field with a high electric field strength (up to 20 MV/cm).
9

HANDLEY, J. W., NETTA COHEN, R. D. BOYLE, and ELIZABETH BERRY. "AN EMPIRICAL ANALYSIS OF NOISE IN PULSED TERAHERTZ SYSTEMS." Fluctuation and Noise Letters 06, no. 01 (March 2006): L65—L76. http://dx.doi.org/10.1142/s021947750600315x.

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Terahertz pulsed imaging systems use broadband pulses of sub-millimetre wavelength radiation for spectroscopy and imaging. This Letter demonstrates that a four parameter stable distribution models the observed noise of the pulses, with two of the parameters dependent on material type and thickness. We additionally show that this noise is not characterised by either Gaussian or Gaussian-mixture models.
10

Dem'yanenko M. A. and Startsev V. V. "Application of uncooled microbolometers for detecting pulsed terahertz and infrared radiation." Technical Physics 92, no. 3 (2022): 359. http://dx.doi.org/10.21883/tp.2022.03.53266.190-21.

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Analytical relations for temperature response of the bolometer to periodic radiation pulses are obtained. It is theoretically shown and experimentally confirmed by the example of infrared bolometers that when detecting short radiation pulses, in contrast to the case of constant radiation, increasing the thermal conductivity of the bolometer and, accordingly, decreasing its thermal relaxation time, it is possible to significantly increase the response rate of the receiver, practically without reducing its sensitivity. The possibility of effective registration of pulsed terahertz radiation by microbolometers with a resistively coupled, thermally non-isolated antenna is considered. It is shown that such bolometers, which have increased thermal conductivity and, accordingly, reduced sensitivity to continuous-wave radiation, can be highly effective when detecting pulsed radiation with a duration shorter than the thermal relaxation time of the bolometer. On their basis, uncooled matrix detectors of pulsed terahertz radiation, characterized by a minimum detectable energy of less than 1·10-12 J and a frame rate of up to 1000 Hz, can be developed. Keywords: microbolometer, pulsed terahertz radiation, antenna.
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Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Terahertz pulses":

1

Koroliov, Anton. "Semiconductor characterization by terahertz radiation pulses." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140922_141151-18493.

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The goal of this dissertation work was to develop pulsed terahertz radiation techniques and use them to study different properties of the semiconductor materials and semiconductor devices. Three groups of materials were investigated: GaAsBi, GaAs nanowires, copper-indium chalcogenide. The used techniques are THz-TDS, optical pump – THZ probe, optical pump – optical probe and THz excitation spectral measurements. The main results that were presented in this dissertation are the following: thermal annealing has resulted in the shortening of electron lifetime in GaAsBi to picosecond values, which is important achievement for the application of this material in THz range components. In GaAsBi layers with larger than 10% Bi content absorption bleaching recovering on the picosecond time scale and its saturation can be realized when the wavelengths of the optical signals are as long as 1600 nm. The results of these studies can be applied in the production of SESAM with bismide absorption layer. The samples with GaAs nanowires emit THz radiation several times better than the bulk GaAs substrates due to enhanced light absorption because of localized surface plasmon resonances in GaAs nanowires. THz emission efficiency from thin copper-indium chalcogenide layers strongly depends on their stoichiometry and on the parameters of the top transparent contact layers, thus it can be used for the mapping of built-in electric fields in solar cells made from these layers.
Šio darbo tikslas buvo susipažinti su terahercinių impulsų generavimo ir detektavimo būdais, įsisavinti įvairias terahercinių impulsų panaudojimo metodikas bei pritaikyti jas puslaidininkių medžiagų ir puslaidininkinių prietaisų tyrimui. Buvo tirtos trys medžiagų grupės: GaAsBi, GaAs nanovielutės ir Cu – In chalkogenidai. Tyrimui buvo naudojamos: THz – TDS, optinio žadinimo – THz zondavimo, optinio žadinimo – optinio zondavimo bei THz sužadinimo spektroskopijos metodikos. Pagrindiniai rezultatai aprašyti disertacijoje yra šie: GaAsBi bandinių atkaitinimas stipriai sumažino krūvininkų gyvavimo trukmes, kas yra naudinga THz komponentų gamyboj. Optinio praskaidrėjimo efektas ir pikosekundžių eilės krūvininkų gyvavimo trukmės GaAsBi epitaksiniuose sluoksniuose su 10% ir daugiau Bi atomų stebimas žadinant juos optine spinduliuote, kurios bangos ilgiai siekia iki 1600 nm. Šios GaAsBi bandinių savybės leidžia juos priakyti įsisotinančių sugėriklių veidrodžių gamyboje. Bandiniai su GaAs nanovielutėmis emituoja THz spinduliuotę kelis kartus geriau nei GaAs padėklas, dėl padidėjusios sugerties, kurią skatina paviršinių optinių plazmonų rezonansai GaAs nanovielutėse. THz emisijos efektyvumas iš Cu-In chalkogenidų sluoksnių stipriai priklauso nuo jų stechiometrijos ir viršutinio skaidraus kontakto parametrų, ir gali būti naudojamas saulės elementų, pagamintų šių sluoksnių pagrindu, vidinių elektrinių laukų tyrimui.
2

Carey, John Joseph. "Near field effects of terahertz pulses." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273433.

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3

González, de Alaiza Martínez Pedro. "Generation of intense terahertz sources by ultrashort laser pulses." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS350/document.

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Le spectre électromagnétique possède une zone étroite, localisée entre les micro-ondes et l'infrarouge, appelée région des ondes térahertz (THz), qui est comprise entre 0.1 et 30 THz. Ces ondes, longtemps inaccessibles car situées à la frontière entre l'électronique et l'optique, connaissent aujourd'hui un intérêt grandissant et possèdent des applications prometteuses dans divers secteurs de la science comme l'imagerie médicale et l'identification des explosifs à distance. Cependant, la production de rayonnement THz intense, d'amplitude proche du GV/m, qui devrait permettre de sonder efficacement des matériaux à distance, reste encore une question en suspens. Cette thèse a précisément pour but d'étudier la génération d'un tel rayonnement THz par couplage de deux impulsions laser ultracourtes -une onde fondamentale et son harmonique deux- capables d'ioniser un gaz (par exemple, l'air ou l'argon). Le plasma ainsi créé joue le rôle de convertisseur nonlinéaire de fréquence, transformant une partie de l'énergie du champ laser dans la bande THz via une gamme riche de mécanismes physiques, notamment l'effet Kerr, la photoionization et les forces pondéromotrices induites dans le plasma. Grâce à un travail de modélisation analytique et numérique de ces principaux mécanismes, nous avons examiné de manière complète la génération d'impulsions THz pour des intensités allant de celles rencontrées en filamentation laser (10¹²-10¹⁴ W cm⁻²) jusqu'aux intensités relativistes (10¹⁵-10¹⁸ W cm⁻²), une fourchette d'intensités peu étudiée jusqu'à présent dans ce domaine. Il est déjà connu qu'à basses intensités la photoionization induite par le champ laser domine l'émission térahertz, laquelle dépend fortement de la configuration des couleurs (ou harmoniques) laser. Nous démontrons ici que, au-delà de la configuration laser ''classique'' à deux couleurs, coupler plusieurs fréquences laser suivant les harmoniques d'une forme d'onde en dents de scie est optimal pour renforcer la production de rayonnement. Les simulations prévoient une efficacité de conversion d'énergie THz de 2% avec quatre couleurs, valeur record inégalée à ce jour. De plus, en nous aidant d'une expérience faite dans l'air, nous identifions la signature de l'effet Kerr dans le spectre THz émis, qui, plus faible, se révèle complémentaire de la signature plasma. Quand l'intensité de l'impulsion laser est augmentée au-delà de 10¹⁵ W cm⁻², nous démontrons que le rayonnement térahertz émis croît de manière non-monotone, dû au fait qu'il existe une valeur d'intensité maximisant l'énergie THz produite par chaque couche électronique. Finalement, nous avons étudié en géométrie 2D l'effet combiné de la photoionization et des forces pondéromotrices plasma à des intensités proches de 10¹⁸ W cm⁻², nous permettant d'obtenir des champs THz excédant le GV/m dans l'argon. Ces dernières forces augmentent avec l'intensité laser et ouvrent des perspectives intéressantes pour la génération de champs térahertz très intenses dans le régime relativiste de l'interaction laser-matière
The electromagnetic spectrum has a narrow frequency band, lying between microwaves and infrared, known as terahertz (THz) waves and extending from 0.1 to 30 THz. These waves, inaccessible until a recent past because they are situated at the boundary between electronics and optics, are raising interest because of their promising applications in several areas such as medical imaging and remote identification of explosives. However, producing intense THz radiation with amplitude belonging to the GV/m range should allow us to probe efficiently remote materials, which still remains an open issue. The goal of this thesis is precisely to study the generation of such intense THz radiation by coupling two ultrashort laser pulses -the fundamental and its second harmonic- able to ionize a gas target (for example, air or argon). The plasma created by photoionization then acts as a nonlinear frequency converter, transforming part of the laser energy into the THz band via a wide range of physical mechanisms including the Kerr effect, the photoionization and ponderomotive forces induced inside the plasma. By means of an analytical and numerical modeling of these key mechanisms, we have comprehensively examined the generation of THz pulses at laser intensities ranging from characteristic intensities met in laser filamentation (10¹²-10¹⁴ W cm⁻²) to sub-relativistic intensities (10¹⁵-10¹⁸ W cm⁻²), this latter intensity range having been little investigated so far in this domain. It is already known that at low intensities laser-induced photionization dominates in terahertzgeneration, which strongly depends on the configuration of the laser colours (or harmonics). We demonstrate here that, beyond the classical two-colour laser setup, coupling several laser frequencies following the harmonics of a sawtooth waveform is optimal to enhance THz production. Simulations predict a laser-to-THz energy conversion efficiency of 2% with four colours, a record value unequalled so far. Moreover, with an experiment realized in air, we identify the Kerr signature in the emitted THz spectrum, which, even weaker, looks complentary to the plasma signature. When the intensity of the laser pulse is increased beyond 10¹⁵ W cm⁻², we prove that the growth of the emitted terahertz radiation is nonmonotonic, due to the fact that that there exists an optimal intensity value that maximizes the THz energy produced by each electronic shell of the irradiated atom. Finally, we have studied in 2D geometry the combined effect of photoionization and ponderomotive forces at intensities close to 10¹⁸ W cm⁻², allowing us to obtain THz fields exceeding the GV/m threshold in argon. These latter forces increase with the laser intensity and thus open interesting perspectives for the generation of very intense terahertz fields in the relativistic regime of laser-matter interaction
El espectro electromagnético posee una zona estrecha, localizada entre las microondas y la radiación infrarroja, llamada región de las ondas Terahertz (THz), que está comprendida entre 0.1 et 30 THz. Estas ondas, durante mucho tiempo inaccesibles debido a que se encuentran situadas en la frontera entre la electrónica y la óptica, están despertando un interés creciente por la gran cantidad de aplicaciones prometedoras que poseen en diversos sectores científicos, como la imagen médica y la identificación de explosivos a distancia. No obstante, la producción de radiación THz intensa, de amplitud cercana al GV/m, la cual debería permitir sondar materiales energéticos a distancia, sigue siendo una cuestión abierta. Esta tesis tiene precisamente como objetivo el estudio de la generación de dicha radiación THz intensa acoplando dos pulsos láser —una onda fundamental y su segundo armónico— capaces de ionizar un gas (por ejemplo, aire o argón). El plasma creado de este modo desempeña el papel de convertidor no lineal de frecuencia, transformando una parte de la energía del láser en la banda THz mediante una rica gama de mecanismos físicos, entre los que destacan el efecto Kerr, la fotoionización y las fuerzas ponderomotrices inducidas dentro del plasma. Gracias a un trabajo de modelización tanto numérico como analítico de estos mecanismos clave, hemos examinado de forma integral la generación de pulsos THz a intensidades láser yendo desde las encontradas en la filamentación láser (10¹²-10¹⁴ W cm⁻²) hasta las cercanas al límite relativista (10¹⁵-10¹⁸ W cm⁻²), habiendo sido este último rango de intensidades poco estudiado en este campo hasta el presente. Ya es sabido que a bajas intensidades la fotoionización inducida por el láser domina la emisión Terahertz, la cual depende enormemente de la configuración de los colores (o armónicos) del láser. Demostramos aquí que, más allá de la “clásica” configuración del láser en dos colores, acoplar varias fréquencias láser siguiendo los armónicos de una forma de onda en diente de sierra es óptimo para incrementar la producción THz. Las simulaciones predicen una eficacia de conversión de energía THz de 2% empleando cuatro colores, un valor récord inigualado hasta hoy. Además, ayudándonos de un experimento realizado en aire, identificamos la firma del effecto Kerr en el espectro THz emitido, la cual, pese a ser más débil, resulta complementaria a la firma del plasma. Cuando se aumenta la intensidad del láser más allá de 10¹⁵ W cm⁻², demostramos que la radiación Terahertz emitida crece de manera no monotóna, debido a que existe un valor de intensidad que maximiza la energía THz producida por cada capa electrónica. Finalmente, hemos estudiado en geometría 2D el efecto conjunto de la fotoionización y de las fuerzas ponderomotrices a intensidades próximas a 10¹⁸ W cm⁻², lo que nos permite obtenter campos THz cuyas amplitudes exceden el GV/m en argon. Estas últimas fuerzas aumentan con la intensidad láser y, por tanto, ofrecen perspectivas interesantes para la generación de campos Terahertz muy intensos en un régimen de interacción láser-materia relativista
4

Suzanovičienė, Rasa. "Investigation of carrier kinetics in semiconductors by terahertz radiation pulses." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101116_163924-89818.

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Creation of ultrafast semiconductor components is inconceivable without understanding various processes of picoscond duration in semiconductors. These processes, as electron energy relaxation time or nonequiriblium carrier capture are very important for semiconductor photonics and terahertz range devices. Since now, the most popular tool of measuring ultrafast processes in semiconductors was picosecond or femtosecond laser pulses. In spite of excellent time resolution, optical pump – probe methods have a significant imperfection. Interpretation of the results can be very complicate. Also, the measured result can be affected by few variable parameters or interaction of various physical phenomenon. Therefore determinate results can be hardly related with electron time dependent characteristic. The aim of this dissertation was to measure electron energy relaxation times and electron life times by using terahertz pulses in narrow – gap semiconductors used for photoconductive terahertz emitters or detectors. In this dissertation, electron characteristic times witch describe various processes in semiconductor, were studied. These measurements were performed by optical pump – terahertz probe technique and time domain terahertz spectroscopy. The emission of terahertz pulses from the semiconductor surface, illuminated by femtosecond laser pulses, was investigated.
Ultrasparčių puslaidininkinių komponentų kūrimas reikalauja gilesnio supratimo apie tai, kaip puslaidininkiuose vyksta fizikiniai procesai, trunkantys kelias pikosekundes ar net mažiau nei vieną pikosekundę. Tokie reiškiniai, kaip elektronų impulso ir energijos relaksacija bei nepusiausvyrųjų krūvininkų pagavimas yra labai svarbūs puslaidininkinių fotonikos ir terahercinio diapazono prietaisų veikimui. Iki pastarojo meto pagrindinis ultrasparčiųjų procesų puslaidininkiuose tyrimo įrankis buvo optiniai metodai, kuriuose elektronų dinamikai stebėti buvo pasitelkiami pikosekundinių ar femtosekundinių lazerių impulsai. Nepaisant išskirtinai didelės šių metodų laikinės skyros, optinio kaupinimo-zondavimo matavimų rezultatus yra palyginti sudėtinga interpretuoti. Šie rezultatai dažniausiai yra įtakojami kelių sistemos parametrų kitimo ir įvairių fizikinių reiškinių tarpusavio sąveikos, todėl sunkiai susiejamas su kuria nors elektronų laikine charakteristika. Disertacijos darbo tikslas – naudojant terahercinės spinduliuotės impulsus išmatuoti elektronų impulso ir energijos relaksacijos trukmes keliuose siauratarpiuose puslaidininkiuose bei jų gyvavimo trukmes medžiagose, skirtose fotolaidžių terahercinės spinduliuotės emiterių ir detektorių gamybai. Šioje disertacijoje yra pateikiami įvairių charakteringų elektroninius procesus puslaidininkiuose apibūdinančių trukmių matavimų naudojant terahercinės spinduliuotės impulsus rezultatai. Tokie tyrimai atlikti ir optinio žadinimo –... [toliau žr. visą tekstą]
5

Chen, Zhao S. M. Massachusetts Institute of Technology Department of Chemistry. "Generation of high power single-cycle and multiple-cycle terahertz pulses." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79269.

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Abstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 131-141).
In this thesis, we present experimental methods and results of tabletop generation of high power single-cycle and frequency-tunable multiple-cycle terahertz (THz) pulses pumped with near-infrared ultrashort optical pulses at 1 kHz and 10 Hz repetition rates. Single-cycle THz pulses with sub-picosecond duration and more than 50 pJ pulse energy, and multiple-cycle THz pulses with picosecond duration and more than 10 pJ pulse energy, are achieved respectively. These THz outputs are very close approximations to Gaussian beams, and can be well collimated and focused into samples for time-resolved spectroscopic experiments. This may allow for explorations in coherent nonlinear spectroscopy in the THz region such as the photon echo and multidimensional spectroscopy, revealing novel phenomena in solids, liquids, gases, and complex materials.
by Zhao Chen.
S.M.
6

JAHANGIRI, Fazel. "Terahertz Emission from Gas and Atomic Cluster Plasmas Induced by Intense Femtosecond Laser Pulses." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157770.

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7

Mori, Kazuaki. "Terahertz-wave generation from atomic clusters under the irradiation of intense femtosecond laser pulses." Kyoto University, 2019. http://hdl.handle.net/2433/242607.

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8

Bičiūnas, Andrius. "Semiconductor materials for components of optoelectronic terahertz systems activated by femtosecond 1 µm wavelength laser pulses." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121107_091148-13422.

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The aim of dissertation was to develop and explore the semiconductor material terahertz (THz) pulse emitters, for Terahertz time–domain spectroscopy (THz–TDS) systems using a 1 μm wavelength femtosecond laser radiation. THz pulse generation and detection using optoelectronic semiconductor components in THz–TDS excited by femtosecond laser pulses become these days a powerful experimental technique. Traditionally, mode-locked Ti:sapphire lasers emitting at the wavelengths ~800 nm are used. However Ti:sapphire lasers require many-stage optical pumping arrangement, the system is quite bulky and complicated. The solution could be the lasers emitting in 1 – 1.55 µm, which can be directly pumped by diode laser bars. Recently, several compact, efficient and cost-effective solid-state and fiber laser systems that generate femtosecond pulses at near-infrared wavelengths have been developed and employed for activating THz–TDS systems. The main obstacle of these systems is the lack of material with appropriate bandgap, high dark resistivity and short (~ ps) carrier lifetimes.
Disertacijos darbo tikslas buvo sukurti ir ištirti puslaidininkinius terahercinių (THz) impulsų emiterius ir detektorius, skirtus sistemoms, naudojančioms 1 μm bangos ilgio femtosekundinę lazerinę spinduliuotę. THz impulsų generavimo ir detektavimo sistema, kurios optoelektroninius puslaidininkinius komponentus aktyvuoja femtosekundiniai lazerio impulsai, yra plačiai taikoma terahercinėje laikinės srities spektroskopijoje. Tradiciškai tokiose sistemose naudojami Ti:safyre femtosekundiniai lazeriai, kurių spinduliuotės bangos ilgis yra ~800 nm. Šios sistemos nėra patogios dėl jų matmenų, nes lazeriai turi sudėtingą kelių pakopų kaupinimo sistemą. Pastaruoju metu THz impulsų generavimui vis dažniau naudojami femtosekundiniai kietakūniai ir šviesolaidiniai lazeriai, kurių spinduliuotės bangos ilgis patenka į artimosios IR spinduliuotės sritį. Tačiau šios sistemos vis dar neturi tinkamos medžiagos fotolaidiems elementams gaminti, kurie būtų žadinami 1 – 1,55 µm bangos ilgio lazeriais. Tokios medžiagos, visų pirmą, turi būti jautrios optinei spinduliuotei, o jų draustinės energijos tarpas turi atitikti žadinamos spinduliuotės fotonų energiją, be to sluoksniai turi pasižymėti didele tamsine varža bei labai trumpomis krūvininkų gyvavimo trukmėmis (~ 1 ps). Šioje disertacijoje yra pateikiami THz impulsų generavimo panaudojus puslaidininkių paviršius ir fotolaidžias antenas rezultatai, žadinant 1 µm bangos ilgio femtosekundiniais lazerio impulsais.
9

Harper, Matthew R. "Control and measurement of ultrafast pulses for pump/probe-based metrology." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/430.

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Jolly, Spencer Windhorst [Verfasser], and Andreas [Akademischer Betreuer] Maier. "Spectral Phase Manipulation of Optical Pump Pulses for mJ-Level Narrowband Terahertz Generation in PPLN / Spencer Windhorst Jolly ; Betreuer: Andreas Maier." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1151322350/34.

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Books on the topic "Terahertz pulses":

1

H, Titterton D., SPIE Europe, Society of Photo-optical Instrumentation Engineers., and United States. Defense Advanced Research Projects Agency., eds. Technologies for optical countermeasures II ; Femtosecond phenomena II ; and, Passive millimetre-wave and terahertz imaging II: 26-28 September, 2005, Bruges, Belgium. Bellingham, Wash: SPIE, 2005.

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Shuntaro, Watanabe, and Midorikawa Katsumi, eds. Ultrafast optics V. New York: Springer, 2004.

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Shuntaro, Watanabe, and Midorikawa Katsumi, eds. Ultrafast optics V. New York: Springer, 2004.

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SPIE, Gerald Joseph Wilmink, and Bennett L. Ibey. Terahertz and Ultrashort Electromagnetic Pulses for Biomedical Applications: 6-7 February 2013, San Francisco, California, United States. SPIE, 2013.

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US GOVERNMENT. Technologies for Optical Countermeasures II; Femtosecond Phenomena II; And, Passive Millimetre-Wave and Terahertz Imaging II: 26-28 September, 2005, B (SPIE Conference Proceedings). SPIE-International Society for Optical Engine, 2005.

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Watanabe, Shuntaro, and Midorikawa Katsumi. Ultrafast Optics V. Springer London, Limited, 2010.

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(Editor), Shuntaro Watanabe, and Katsumi Midorikawa (Editor), eds. Ultrafast Optics V (Springer Series in Optical Sciences) (Springer Series in Optical Sciences). Springer, 2007.

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Book chapters on the topic "Terahertz pulses":

1

Bonvalet, A., and M. Joffre. "Terahertz Femtosecond Pulses." In Femtosecond Laser Pulses, 285–305. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03682-2_10.

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Hegmann, Frank A., Oksana Ostroverkhova, and David G. Cooke. "Probing Organic Semiconductors with Terahertz Pulses." In Photophysics of Molecular Materials, 367–428. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607323.ch7.

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Sengupta, Suranjana. "Generation of Sub-Picosecond Terahertz Pulses." In Characterization of Terahertz Emission from High Resistivity Fe-doped Bulk Ga0.69In0.31As Based Photoconducting Antennas, 9–30. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-8198-1_2.

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Roskos, H. G., T. Pfeifer, H. M. Heiliger, T. Löffler, and H. Kurz. "Tunable Coherent THz Radiation Pulses From Optically Excited Bloch Oscillations." In New Directions in Terahertz Technology, 369–75. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5760-5_28.

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Yi, Minwoo, and Jaewook Ahn. "Sub-single Cycle Pulses of Electromagnetic Radiation." In Convergence of Terahertz Sciences in Biomedical Systems, 163–79. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-3965-9_8.

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Whitaker, J. F., H. Cheng, T. M. Weller, and L. P. B. Katehi. "Guided-Wave Propagation of Terahertz-Bandwidth Electrical Pulses." In Ultra-Wideband, Short-Pulse Electromagnetics 2, 1–8. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1394-4_1.

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Lamiri, Mohamed, Mohammed El Ghzaoui, and Bilal Aghoutane. "Monopole Patch Antenna to Generate and Detect THz Pulses." In Advances in Terahertz Technology and Its Applications, 273–91. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5731-3_16.

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Mitrofanov, Oleg, Mark Lee, L. N. Pfeiffer, and K. W. West. "Spectral amplitude and phase changes in diffraction of Terahertz pulses." In Ultrafast Phenomena XIII, 286–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_89.

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Nuss, M. C., K. W. Goossen, P. M. Mankiewich, M. L. O’Malley, J. L. Marshall, and R. E. Howard. "Far-Infrared Spectroscopy of High Temperature Superconductors with Terahertz Electrical Pulses." In Springer Series in Chemical Physics, 348–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84269-6_106.

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Planken, P. C. M., and M. C. Nuss. "Optical Generation of Terahertz Pulses from Polarized Excitons in Quantum Wells." In Ultrafast Phenomena VIII, 487–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84910-7_156.

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Conference papers on the topic "Terahertz pulses":

1

Bakunov, M. I., and M. V. Tsarev. "Terahertz Pulses with High-Field Unipolar Precursors." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2019. http://dx.doi.org/10.1364/jsap.2019.19p_e215_1.

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Strong electric and magnetic fields in the terahertz frequency range are required for many applications, including particle acceleration, molecular orientation, and terahertz streaking techniques. The strongest fields are currently generated by optical rectification of ultrashort laser pulses in nonlinear crystals. Multiphoton absorption is considered as one of the main factors that limits the optical pump intensity. It leads to a depletion of the pump pulse and photogeneration of free carriers that absorb terahertz radiation.
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Planken, P. C. M., and M. C. Nuss. "Optical generation of terahertz pulses from polarized excitons in quantum wells." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tutt2.

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Until recently, it was believed that the generation of 1 terahertz pulses from the surface of a bulk semiconductor was caused by transient transport currents in the surface depletion layer of the material. We have generated terahertz pulses from an Al0.3Ga0.7As/ GaAs MQW sample after illumination with a 100 fs laser pulse, with an amplitude comparable to the one from a bulk GaAs sample. Since transport current in a quantum well is inhibited significantly, this proves that the radiation is generated by a recently proposed additional mechanism used to explain the creation of terahertz pulses from the surface of semiconductors. This explanation is based on the optical creation of electron-hole pairs in states in which they are already polarized. This leads to a time- dependent total polarization P that grows with the integrated pulse energy and hence radiates an electrical transient. In a wide MQW sample consisting of 15 periods of 175-Å GaAs wells separated by 150-Å Al0.3Ga0.7 As barriers, we observe an oscillatory terahertz signal lasting for several picoseconds when we coherently excite both the light hole and the heavy hole excitons. The oscillation frequency matches the light hole-heavy hole energy splitting, and we attribute the signal to a beating between the two.
3

Grischkowsky, D., C. Fattinger, Martin Van Exter, and Soren R. Keiding. "Applications of terahertz beams." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.tub1.

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Using our newly developed techniques of terahertz optics,1 we have generated well-collimated beams of freely propagating subpicosecond electromagnetic pulses. By comparing the high speed response of different receiver-transmitter combinations, we have optimized the system so that the terahertz pulses are detected with subpicosecond resolution and with signal-to-noise ratios of more than 1000:1. With this terahertz source, time domain spectroscopic measurements of single crystals of sapphire, quartz, MgO, and high resistivity silicon have provided the most accurate characterization of their terahertz dielectric properties to date. When the terahertz beams propagate through as little as 20 cm of laboratory air, a 50-ps duration oscillatory structure appears after the main subpicosecond pulse. This structure is caused by the absorption and dispersion of several strong resonance lines in water vapor. Using a controlled ambient atmosphere for the terahertz beam path, we have made the most accurate measurements to date of the absorption strengths of the nine strongest lines of water vapor in the spectral region from 0.2 to 1.5 THz.
4

Dorney, Timothy, Jon Johnson, Daniel Mittleman, and Richard G. Baraniuk. "Imaging with terahertz pulses." In International Symposium on Optical Science and Technology, edited by Andrew G. Tescher. SPIE, 2000. http://dx.doi.org/10.1117/12.411592.

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Jeon, Tae-In. "Long distance Terahertz pulse propagation through atmosphere." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.7p_a409_2.

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Recently, there have been studies of broadband coherent THz pulse propagation under atmospheric weather conditions [1], which provides information for important applications in the atmosphere. In this study, the THz pulses were measured through a 159 m and 883 m distances for which the THz pulses propagated in an outdoor atmosphere with different water vapor density (WVD). The total round trip paths between the transmitter and receiver chips were 186 m and 910 m, which are approximately equal to 52 and 255 round-trips of the circulating 50 fs optical pulse within the mode-locked ring laser, thereby, giving sampling pulses delayed by 52 and 255 pulses down the pulse train from the excitation pulses, respectively. The time shift of the THz pulses was proportional to the WVD. Figure 1 shows the transmitted THz pulses through 186 m and 910 m with different WVDs. The THz pulse delays due to the distance and WVD with respect to the first maximum of the pulse. Finally, the time shift of the THz pulses of the 186- and 910-m distance, for which the outdoor propagation distances are 159 and 883 m with including 27 m indoor propagation distance for both measurements, can be measured as a function of WVD. THz long path WVD studies are necessary to investigate the proposed applications in the atmosphere such as THz communications and monitoring for pollutants and dangerous gases.
6

Howells, S. C., and L. A. Schlie. "Generation of terahertz radiation by difference-frequency mixing of femtosecond pulses in InSb and InAs." In Nonlinear Optics: Materials, Fundamentals and Applications. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/nlo.1996.nwb.3.

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The role of nonlinear optical phenomena in the generation of terahertz radiation via nonlinear mixing of ultrashort infrared laser pulses at semiconductor surfaces is described. Several mechanisms lead to the generation of terahertz radiation from semiconductor surfaces, including depletion-field driven current (current surge),1 bulk difference-frequency mixing (DFM),2 and electric-field-induced optical rectification.3 Previous studies reported that when InSb is illuminated with unfocused above-gap ultrashort optical pulses, the spectrum of the emitted radiation, which is due to the current surge mechanism, shifted to lower frequency as the sample temperature decreased.1,4 This unique feature has led us to study the temperature dependence of difference-frequency mixing from InSb crystals illuminated with focused laser pulses. Increasing the intensity of the 100 fs laser pump beam leads to measurable amounts of terahertz radiation by nonlinear mixing of the spectral components of the pump pulse, as well as a decrease in the current-surge-induced terahertz radiation.2 By rotating an undoped (111) InSb sample about its surface normal, we were able to separate the contribution of the azimuthally-dependent DFM signal from the total terahertz waveform. Contrary to the current surge pulses emitted from (111) InSb, the DFM pulses did not show any frequency shift with temperature. However, there was a pronounced temperature dependence of the DFM pulse amplitude that closely followed that seen from the current surge pulses. Finally, analysis of the angular dependence of terahertz radiation emitted from (100) InAs shows that the dominant nonlinear mixing term is bulk optical rectification.
7

Grischkowsky, Daniel. "Terahertz radiation and spectroscopy." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.fd.1.

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Various mechanisms for generating short pulses of terahertz radiation by excitation with ultrafast laser pulses are described, together with optoelectronic and bolometric means of terahertz detection.
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Simpson, Tanner T., Jeremy Pigeon, Kyle Miller, Kathleen Weichman, Manfred Virgil Ambat, Dillon Ramsey, Dustin H. Froula, and John P. Palastro. "Two-color Terahertz Generation by Flying Focus Pulses." In Nonlinear Optics. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/nlo.2023.th2b.2.

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A pair of focused harmonics can drive an ionization front and transient current which generates broadband terahertz radiation. We show that controlling the ionization front trajectory can tune the terahertz emission angle.
9

Fattinger, Ch, and D. Grischkowsky. "Beams of Terahertz Electromagnetic Pulses." In Picosecond Electronics and Optoelectronics. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/peo.1989.osda225.

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The generation of diffraction limited beams of single-cycle 0.5 terahertz electromagnetic pulses is described. The beams, centimeters in diameter, have a frequency independent divergence of only 15 mrad and have been propagated distances up to 350 cm. The very high collection efficiency of the optical system used for the generation and the detection of these beams provides exceptionally clean and sensitive reception of the transmitted signal. A spectral characterization of water vapor in the intervening ambient air is also presented.
10

Benicewicz, P. K., A. J. Taylor, J. P. Roberts, N. A. Kurnit, X. C. Zhang, and D. H. Auston. "Terahertz electromagnetic pulse generation using 150-μJ, 800-nm femtosecond pulses." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tutt3.

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Subpico-second pulses of terahertz electromagnetic radiation are generated by femtosecond optical pulses incident on a large-aperture biased photoconductor. The key advantage of a large-aperture biased photoconductor is the ability to generate high power pulses by increasing the size of the aperture of the photoconductor to accept very high optical energies and high applied bias voltages. This power scaling feature of large-aperture photoconductors has been studied by others using the 8-μJ, 620-nm optical pulses from an amplified CPM laser system. Applied bias fields up to 7 kV/cm were used on semiconductors having 0.5-4 mm electrode gap spacings. We present the results of the generation of terahertz electromagnetic pulses using the amplified 800-nm, 150-μJ, 200-fs optical output from a 5-Hz laser system incident on the biased surfaces of GaAs and InP wafers. Wider gap spacings and larger optical energies permit further investigation into the power scaling and saturation properties of the photoconductors. Our use of 1.5-eV rather than 2-eV photons permits a comparison of results as a function of photon energy.

Reports on the topic "Terahertz pulses":

1

Heinz, Tony F. Optoelectronics Generation and Detection of Intense Terahertz Electromagnetic Pulses. Fort Belvoir, VA: Defense Technical Information Center, June 1996. http://dx.doi.org/10.21236/ada311021.

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2

Bowlan, Pamela Renee. Ultrafast control and monitoring of material properties using terahertz pulses. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1334176.

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3

Lang, Wei, Jeffrey M. Warrender, and X. C. Zhang. Chirp-Pulse Terahertz Range Profiling. Fort Belvoir, VA: Defense Technical Information Center, October 2007. http://dx.doi.org/10.21236/ada611255.

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4

Post, Kirk. A tabletop pulsed magnet system for terahertz optical spectroscopy. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1606337.

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Wraback, Michael, Anand Sampath, and Dimitra Stratis-Cullum. Compact Femtosecond Pulse Approach to Explosives Detection Combining InN-Based Time Domain Terahertz Spectroscopy and Laser-Induced Breakdown Spectroscopy. Fort Belvoir, VA: Defense Technical Information Center, August 2008. http://dx.doi.org/10.21236/ada486227.

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