Academic literature on the topic 'GHz-bursts'

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Journal articles on the topic "GHz-bursts"

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White, Stephen M., Masumi Shimojo, Kazumasa Iwai, Timothy S. Bastian, Gregory D. Fleishman, Dale E. Gary, Jasmina Magdalenic, and Angelos Vourlidas. "Electron Cyclotron Maser Emission and the Brightest Solar Radio Bursts." Astrophysical Journal 969, no. 1 (June 21, 2024): 3. http://dx.doi.org/10.3847/1538-4357/ad4640.

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Abstract This paper investigates the incidence of coherent emission in solar radio bursts, using a revised catalog of 3800 solar radio bursts observed by the Nobeyama Radio Polarimeters from 1988 to 2023. We focus on the 1.0 and 2.0 GHz data, where radio fluxes of order 1010 Jy have been observed. Previous work has suggested that these bursts are due to electron cyclotron maser (ECM) emission. In at least one well-studied case, the bright emission at 1 GHz consists of narrowband spikes of millisecond duration. Coherent emission at 1 GHz can be distinguished from traditional incoherent gyrosynchrotron flare emission based on the radio spectrum: Gyrosynchrotron emission at 1 GHz usually has a spectrum rising with frequency, so bursts in which 1 GHz is stronger than higher-frequency measurements are unlikely to be incoherent gyrosynchrotron. Based on this criterion, it is found that for bursts exceeding 100 sfu, three-quarters of all bursts at 1 GHz and half of all 2 GHz bursts have a dominant coherent emission component, assumed to be ECM. The majority of the very bright bursts at 1 GHz are highly circularly polarized, consistent with a coherent emission mechanism, but not always 100% polarized. The frequency range from 1 to 2 GHz is heavily utilized for terrestrial applications, and these results are relevant for understanding the extreme flux levels that may impact such applications. Further, they provide a reference for comparison with the study of ECM emission from other stars and potentially exoplanets.
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Жданов, Дмитрий, Dmitriy Zhdanov, Сергей Лесовой, Sergey Lesovoi, Сусанна Тохчукова, and Susanna Tokhchukova. "Sources of type III solar microwave bursts." Solnechno-Zemnaya Fizika 2, no. 2 (June 17, 2016): 12–21. http://dx.doi.org/10.12737/17341.

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Microwave fine structures allow us to study plasma evolution in an energy release region. The Siberian Solar Radio Telescope (SSRT) is a unique instrument designed to examine fine structures at 5.7 GHz. A complex analysis of data from RATAN-600, 4–8 GHz spectropolarimeter, and SSRT, simultaneously with extreme UV data, made it possible to localize sources of III type microwave drift bursts in August 10, 2011 event within the entire frequency band of burst occurrences, as well as to determine the most probable region of primary energy release. To localize sources of III type bursts from RATAN-600 data, an original method for data processing has been worked out. At 5.7 GHz, the source of bursts was determined along two coordinates whereas at 4.5, 4.7, 4.9, 5.1, 5.3, 5.5 and 6.0 GHz, their locations were identified along one coordinate. The size of the burst source at 5.1 GHz was found to be maximum as compared to source sizes at other frequencies.
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Жданов, Дмитрий, Dmitriy Zhdanov, Сергей Лесовой, Sergey Lesovoi, Сусанна Тохчукова, and Susanna Tokhchukova. "Sources of type III solar microwave bursts." Solar-Terrestrial Physics 2, no. 2 (August 10, 2016): 15–27. http://dx.doi.org/10.12737/20996.

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Microwave fine structures allow us to study plasma evolution in an energy release region. The Siberian Solar Radio Telescope (SSRT) is a unique instrument designed to examine fine structures at 5.7 GHz. A complex analysis of data from RATAN-600, 4–8 GHz spectropolarimeter, and SSRT, simultaneously with EUV data, made it possible to localize sources of III type microwave bursts in August 10, 2011 event within the entire frequency band of burst occurrence, as well as to determine the most probable region of primary energy release. To localize sources of III type bursts from RATAN-600 data, an original method for data processing has been worked out. At 5.7 GHz, the source of bursts was determined along two coordinates, whereas at 4.5, 4.7, 4.9, 5.1, 5.3, 5.5, and 6.0 GHz, their locations were identified along one coordinate. The size of the burst source at 5.1 GHz was found to be maximum as compared to those at other frequencies.
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Palliyaguru, Nipuni T., Devansh Agarwal, Golnoosh Golpayegani, Ryan Lynch, Duncan R. Lorimer, Benjamin Nguyen, Alessandra Corsi, and Sarah Burke-Spolaor. "A targeted search for repeating fast radio bursts associated with gamma-ray bursts." Monthly Notices of the Royal Astronomical Society 501, no. 1 (October 29, 2020): 541–47. http://dx.doi.org/10.1093/mnras/staa3352.

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ABSTRACT The origin of fast radio bursts (FRBs) still remains a mystery, even with the increased number of discoveries in the last 3 yr. Growing evidence suggests that some FRBs may originate from magnetars. Large, single-dish telescopes such as Arecibo Observatory (AO) and Green Bank Telescope (GBT) have the sensitivity to detect FRB 121102-like bursts at gigaparsec distances. Here, we present searches using AO and GBT that aimed to find potential radio bursts at 11 sites of past gamma-ray bursts that show evidence for the birth of a magnetar. We also performed a search towards GW170817, which has a merger remnant whose nature remains uncertain. We place $10\sigma$ fluence upper limits of ≈0.036 Jy ms at 1.4 GHz and ≈0.063 Jy ms at 4.5 GHz for the AO data and fluence upper limits of ≈0.085 Jy ms at 1.4 GHz and ≈0.098 Jy ms at 1.9 GHz for the GBT data, for a maximum pulse width of ≈42 ms. The AO observations had sufficient sensitivity to detect any FRB of similar luminosity to the one recently detected from the Galactic magnetar SGR 1935+2154. Assuming a Schechter function for the luminosity function of FRBs, we find that our non-detections favour a steep power-law index (α ≲ −1.1) and a large cut-off luminosity (L0 ≳ 1041 erg s−1).
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Sawant, H. S., R. R. Rosa, J. R. Cecatto, and N. Gopalswamy. "Solar Simple Bursts Observed with High Spectral Resolution in the 18-23 GHz Range." International Astronomical Union Colloquium 142 (1994): 693–95. http://dx.doi.org/10.1017/s0252921100077976.

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AbstractFor the first time, solar bursts in the frequency range of (18-23) GHz have been observed with high-time (0.6-1.2 s) and high-frequency resolution (1 GHz), by using the Itapetinga 13.7m diameter antenna. Here, we investigate the microwave type “simple low level (< 10 SFU) bursts” associated with the impulsive phase of solar flares. Observed properties of these simple bursts are: rise time tr ~3 s, decay time td ~ 5 s and spectral index ranging between −1 and −4. These bursts were found to be associated with SF or SN flares as seen in Hα. The above properties suggest that they are likely to be a microwave counterpart of elementary flare bursts. In the majority of the cases the spectral evolution is soft-hard-soft. This suggests a nonthermal gyrosynchrotron mechanism for generating these elementary flare bursts. Estimated parameters of these simple burst sources are height (h ~ 2400 km), electron density (Nє < 8.8 × 109 cm−3 ), and magnetic field (B ~ 300 G).Subject headings: radiation mechanisms: nonthermal — Sun: radio radiation
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Houben, L. J. M., L. G. Spitler, S. ter Veen, J. P. Rachen, H. Falcke, and M. Kramer. "Constraints on the low frequency spectrum of FRB 121102." Astronomy & Astrophysics 623 (March 2019): A42. http://dx.doi.org/10.1051/0004-6361/201833875.

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While repeating fast radio bursts (FRBs) remain scarce in number, they provide a unique opportunity for follow-up observations that enhance our knowledge of their sources and potentially of the FRB population as a whole. Attaining more burst spectra could lead to a better understanding of the origin of these bright, millisecond-duration radio pulses. We therefore performed ∼20 h of simultaneous observations on FRB 121102 with the Effelsberg 100 m radio telescope and the low frequency array (LOFAR) to constrain the spectral behaviour of bursts from FRB 121102 at 1.4 GHz and 150 MHz. This campaign resulted in the detection of nine new bursts at 1.4 GHz but no simultaneous detections with LOFAR. Assuming that the ratio of the fluence at two frequencies scales as a power law, we placed a lower limit of α > −1.2 ± 0.4 on the spectral index for the fluence of the instantaneous broad band emission of FRB 121102. For the derivation of this limit, a realistic fluence detection threshold for LOFAR was determined empirically assuming a burst would be scattered as predicted by the NE2001 model. A significant variation was observed in the burst repeat rate R at L-band. During observations in September 2016, nine bursts were detected, giving R = 1.1 ± 0.4 h−1, while in November no bursts were detected, yielding R < 0.3 h−1 (95% confidence limit). This variation is consistent with earlier seen episodic emission of FRB 121102. In a blind and targeted search, no bursts were found with LOFAR at 150 MHz, resulting in a repeat rate limit of R < 0.16 h−1 (95% confidence limit). Burst repeat rate ratios of FRB 121102 at 3, 2, 1.4, and 0.15 GHz are consistent within the uncertainties with a flattening of its spectrum below 1 GHz.
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Kawabata, K., and H. Ogawa. "Solar Millimeter Wave Bursts." International Astronomical Union Colloquium 104, no. 2 (1989): 191–94. http://dx.doi.org/10.1017/s0252921100154132.

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Matsumoto, Hisashi, Zhibin Lin, Joel N. Schrauben, and Jan Kleinert. "Ultrafast laser ablation of silicon with ∼GHz bursts." Journal of Laser Applications 33, no. 3 (August 2021): 032010. http://dx.doi.org/10.2351/7.0000372.

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Kaufmann, P., F. M. Strauss, J. E. R. Costa, and E. Correia. "Circular polarization of solar bursts at 22 GHz." Solar Physics 148, no. 2 (December 1993): 341–58. http://dx.doi.org/10.1007/bf00645094.

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Lyu, Fen, En-Wei Liang, and D. Li. "Narrowly Banded Spectra with Peak Frequency around 1 GHz of FRB 20201124A: Implications for Energy Function and Radiation Physics." Astrophysical Journal 966, no. 1 (April 29, 2024): 115. http://dx.doi.org/10.3847/1538-4357/ad3354.

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Abstract The radiation physics of fast radio bursts (FRBs) remains an open question. Current observations have discovered that narrowly banded bursts of FRB 20201124A are active in 0.4–2 GHz, and their spectral peak frequency ( ν p obs ) is mostly toward ∼1 GHz. Utilizing a sample of 1268 bursts of FRB 20201124A detected with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we show that the 1σ spectral regime of 71.4% of the events (in-band bursts) is within the FAST bandpass. The intrinsic burst energies ( E BWe obs ) and spectral widths ( σ s obs ) are well measured by fitting the spectral profile with a Gaussian function. The derived E BWe obs and σ s obs distributions are lognormal and centered at log E BWe obs / erg = 37.2 ( σ = 0.76 ) and log σ s obs / GHz = − 1.16 ( σ = 0.17 ) . Our Monte Carlo simulation analysis infers its intrinsic ν p distribution as a normal function centered at ν p,c = 1.16 GHz (σ = 0.22) and its intrinsic energy function as Φ ( E ) ∝ E − 0.60 e − E / E c with E c = 9.49 × 1037 erg. We compare these results with that of typical repeating FRBs 20121102A and 20190520B, which are active over a broad frequency range at several specific frequencies, and discuss possible observational biases on the estimation of the event rate and energy function. Based on these results, we argue that FRB 20201124A likely occurs in a fine-tuned plasma for maser radiation at a narrow frequency range, while FRB 20121102A and FRB 20190520B could involve clumpy plasma conditions that make maser emission around several specific frequencies in a broad range.
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Dissertations / Theses on the topic "GHz-bursts"

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Balage, Pierre. "Etude de l’interaction des matériaux à gap avec des lasers femtosecondes en mode rafale GHz." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0164.

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Ces deux dernières décennies, la technologie laser femtoseconde a gagné en maturité et fiabilité. Cette évolution lui a permis d’être mise en œuvre dans de nombreux secteurs industriels pour des applications de micro-usinage de précision pour lesquelles la brièveté de l’impulsion constitue un atout incontestable. Cependant, la pénétration de cette technologie dans l’industrie est freinée par le manque de productivité de ces procédés. En effet, cette productivité est bien en-deçà des attentes industrielles. Plusieurs stratégies sont à l’étude pour lever ce verrou technologique et optimiser la productivité des procédés de transformation de la matière par lasers femtosecondes. L’une de ces stratégies consiste à optimiser le dépôt d’énergie en utilisant des rafales d’impulsions femtosecondes de faible intensité plutôt que des impulsions uniques de haute intensité.De récents travaux ont montré que l’utilisation du régime rafales GHz permettait d’obtenir des efficacités bien supérieures à celle obtenues en régime mono-impulsion classique. Cependant, ces premiers résultats ont été rapidement contestés par d’autres études attestant une efficacité plus faible ainsi que la présence de défauts d’usinage en régime rafale GHz. Afin d’être de dégager un consensus concernant ce nouveau régime d’interaction et d’apporter des données objectives à l’état de l’art, il était nécessaire de mener des études expérimentales approfondies. Pour ce faire, nous avons mené en étroite collaboration avec la société Amplitude des travaux de recherche sur les procédés, tels que le perçage ou la découpe par faisceau de Bessel, en utilisant un laser femtoseconde de puissance moyenne 100 W délivrant des rafales GHz. Cette étude nous a permis d’étudier l’influence des paramètres liés aux rafales et de mener des études comparatives avec les régimes existant (mono-impulsion et rafales MHz). Nous avons également pu mettre en place une expérience pompe-sonde inédite qui nous a permis de révéler le mécanisme d’interaction laser-matière en rafales GHz. Les excellents résultats obtenus dans le cadre de ce travail de thèse démontrent la capacité unique des rafales GHz à usiner des matériaux comme les diélectriques et les semi-conducteurs
Over the past two decades, femtosecond laser technology has become significantly more reliable which has particularly enabled its integration into industry, as the brevity of such pulses allows for high-precision micromachining. However, the adoption of this technology in the industry remains hindered by a lack of productivity. Indeed, the production rate remains well below the ever-evolving industry targets. To address this limitation, several methods are being studied to increase the throughput by optimizing femtosecond laser processes. One approach relies on optimizing the energy deposition by using bursts of low-intensity femtosecond pulses rather than single high-intensity pulses.Recent studies have shown that using GHz-bursts can achieve ablation efficiencies far superior to those obtained with more conventional methods. However, these initial results have been quickly challenged by other studies reporting lower efficiency and the presence of machining defects. To reach a consensus on this new regime, comprehensive experimental studies are needed to add data to the current state of the art. To this end, process studies such as microdrilling experiments and cutting with a Bessel beam have been implemented using a 100 W Amplitude laser delivering GHz-bursts. Close collaboration with the company Amplitude has allowed for investigating numerous burst parameters and conducting comparative studies with existing regimes (single-pulse and MHz-bursts). Moreover, a pump-probe experiment has been set up revealing the laser-matter interaction mechanism in GHz-burst mode. Throughout this thesis work, excellent results have been obtained, demonstrating the unique capability of GHz-bursts for microprocessing materials like dielectrics and semiconductors
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Books on the topic "GHz-bursts"

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Tlamicha, Antonín. Spectral observations of solar radio bursts at 2.0-4.5 GHz: January-August 1991. [Prague: Astronomical Institute of the Czechoslovak Academy of Sciences], 1991.

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Tlamicha, Antonín. Spectral observations of solar radio bursts at 2.0-4.5 GHz: January-December 1990. [Prague: Astronomical Institute of the Czechoslovak Academy of Sciences], 1991.

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Tlamicha, Antonín. Spectral observations of solar radio bursts in the range of 2.0-4.5 GHz: April-December 1989. [Prague: Astronomical Institute of the Czechoslovak Academy of Sciences], 1990.

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Conference papers on the topic "GHz-bursts"

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Nyenhuis, Fabian, Andreas Michalowski, and Johannes A. L'huillier. "Surface treatment with GHz-bursts." In Laser-based Micro- and Nanoprocessing XIV, edited by Udo Klotzbach, Rainer Kling, and Akira Watanabe. SPIE, 2020. http://dx.doi.org/10.1117/12.2544337.

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Bartulevičius, T., M. Lipnickas, K. Madeikis, R. Burokas, D. Andriukaitis, and A. Michailovas. "Versatile Ultrashort Pulse Laser Tunable up to Nanosecond Range." In Advanced Solid State Lasers. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/assl.2023.atu2a.6.

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A versatile industrial-grade 30 W-level average power femtosecond laser operating in single-pulse, GHz-burst (short-, long-bursts, GHz-bursts-in-MHz-bursts) regimes, with the ability to tune pulse duration from femtosecond up to nanosecond range is introduced in this work.
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Kleinert, Jan, Zhibin Lin, and Hisashi Matsumoto. "Ultrafast laser ablation of copper with ~GHz bursts." In Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, edited by Beat Neuenschwander, Gediminas Račiukaitis, Tetsuya Makimura, and Costas P. Grigoropoulos. SPIE, 2018. http://dx.doi.org/10.1117/12.2294041.

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Manek-Hönninger, Inka, Samba Niane, Guillaume Bonamis, Pierre Balage, Eric Audouard, Clemens Hönninger, Eric Mottay, and John Lopez. "High aspect ratio and high-speed glass drilling with femtosecond GHz-bursts." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jth6a.3.

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We report on high aspect ratio and high-speed glass drilling with femtosecond GHz-bursts. The drilling process dynamics of deep and high-quality holes in different glasses and sapphire is monitored by in-situ microscopy and thermal imaging.
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Balage, Pierre, John Lopez, Guillaume Bonamis, Clemens Hönninger, and Inka Manek-Hönninger. "Long and crack-free holes in glass by top-down drilling with femtosecond laser GHz-bursts." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_at.2023.am4r.3.

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We report on extremely long, high quality, and crack-free holes in sodalime and fused silica by laser drilling with femtosecond GHz-bursts, where aspect ratios exceeding 30 and even 70 have been obtained, respectively.
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Obata, Kotaro, Francesc Caballero-Lucas, Shota Kawabata, Godai Miyaji, and Koji Sugioka. "High-speed ablation of crystalline silicon by femtosecond laser BiBurst mode with GHz burst in MHz burst." In Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.cthp5d_02.

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We demonstrate highly efficient ablation of silicon by use of BiBurst mode, which is composed of GHz bursts in MHz bursts. Ablation by the conventional irradiation scheme of femtosecond laser pulses (single-mode) generates detrimental damage on the ablated surface due to air ionization at the intensity above a critical value. In contrast, the BiBurst mode ablation can prevent the air ionization at the input power equal to or even higher than the single-mode due to lower intra-pulse intensities. Thus, BiBurst mode can achieve 23 times ablation speed without degrading the ablation quality compared to that by the single-mode ablation under the conditions that avoid the air ionization.
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Momeni, Ashkan, and Koji Sugioka. "Femtosecond Laser Ablation of Silicon using GHz to THz Burst Pulses: Numerical Simulation." In JSAP-Optica Joint Symposia. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/jsapo.2023.19p_b205_8.

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In recent years, laser processing with GHz and THz bursts of femtosecond pulses has attracted great attention to improving the efficiency of laser-induced microfabrication [3, 4]. The efficient absorption of laser energy in the GHz burst and the heat-accumulation effect have been proposed as the main mechanisms for ablation enhancement [3-5]. However, the possible mechanisms have not yet been fully elucidated and more investigations are needed. Therefore, in this study, we used COMSOL Multiphysics to simulate the GHz and THz burst mode femtosecond laser ablation of silicon and investigate the responsible mechanisms of the ablation efficiency enhancement.
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MacFarlane, Duncan L., and Vishwa Narayan. "Terahertz pulse bursts and codes from an optical rattler." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tuz7.

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We describe a relatively simple way to produce pulse bursts with frequencies around a terahertz. The method here is an optical rattler, operated in an extreme regime.1 The concept of the optical rattler is several partially reflecting mirrors arranged in a delay line. These mirrors reposition part of the energy in a single pulse into the dark space behind the pulse. Mathematically, each reflectivity provides a degree of freedom and each output pulse amplitude provides a constraint. Consequently, pulse trains—discrete time signals—of any shape may be engineered, even those with abrupt gaps or zeros embedded in them. Our experimental work relies on precisely coated, thin glass substrates. A stack of these has been used to manipulate a 400 fs pulse from a hybridly mode-locked dye laser into pulse bursts and codes with a repetition rate of 600 GHz.
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Remund, Stefan M., Markus A. Gafner, Michalina V. Chaja, Aivaras Urniežius, Simas Butkus, and Beat Neuenschwander. "Comparison of ultrashort pulse laser ablation with GHz pulse bursts and MHz pulse bursts of metals, silicon, and dielectric materials." In Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXVI, edited by Carlos Molpeceres, Aiko Narazaki, and Jie Qiao. SPIE, 2021. http://dx.doi.org/10.1117/12.2583192.

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Roelens, Michael A. F., Jeremy A. Bolger, David Williams, and Benjamin J. Eggleton. "Arbitrary pulse bursts at 40 GHz created with a wavelength selective switch." In 2008 Joint Conference of the Opto-Electronics and Communications Conference (OECC) and the Australian Conference on Optical Fibre Technology (ACOFT). IEEE, 2008. http://dx.doi.org/10.1109/oeccacoft.2008.4610522.

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