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Готові списки джерел за темами / Lamb-dip

Добірка наукової літератури з теми "Lamb-dip"

Автор: Grafiati

Опубліковано: 7 липня 2024

Оновлено: 7 липня 2024

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Статті в журналах з теми "Lamb-dip":

1

Alekseev, R. A., I. V. Lapkin, A. V. Lapinov, T. A. Khabarova, G. Yu Golubyatnikov, A. F. Andriyanov, A. P. Schkaev, and P. M. Zemlyanukha. "Quasi-Optical Sub-Doppler Lamb-Dip Spectrometer." Izvestiya vysshikh uchebnykh zavedenii. Radiofizika 64, no. 12 (2021): 971–82. http://dx.doi.org/10.52452/00213462_2021_64_12_971.

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2

Aissani, A., S. Leghmizi, and K. Battou. "Models of Geometrically “Stabilized” Laser Cavity." MATEC Web of Conferences 253 (2019): 02002. http://dx.doi.org/10.1051/matecconf/201925302002.

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The Lamb-dip characterizing the line shape emitted by a gas laser is often used in spectroscopy of materials as a reference for frequency measurements. For such lasers, the frequency control is performed on the Lamb-dip. It is therefore essential, for accurate measurements, that its frequency matches with the laser resonance frequency. This is only possible if the emitted line shape is symmetrical, which is not usually the case. Indeed, the lens effects induced in the laser amplifying medium, which are due to the population and the saturation inhomogeneities, generally produce an asymmetrical emitted line shape. So, the frequency of the Lamb-dip is shifted compared to the central frequency. In this work, we will first revisit the model given in the literature, in order to highlight the limit of its validity, and then we will propose through an appropriate choice of the cavity geometry, a "stabilized" cavity model giving rise to a symmetrical line shape even when the control parameters vary.

3

Di Sarno, V., R. Aiello, M. De Rosa, I. Ricciardi, S. Mosca, G. Notariale, P. De Natale, L. Santamaria, and P. Maddaloni. "Lamb-dip spectroscopy of buffer-gas-cooled molecules." Optica 6, no. 4 (April 4, 2019): 436. http://dx.doi.org/10.1364/optica.6.000436.

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4

Schneider, M., A. Hinz, A. Groh, K. M. Evenson, and W. Urban. "CO laser stabilization using the optogalvanic Lamb-dip." Applied Physics B Photophysics and Laser Chemistry 44, no. 4 (December 1987): 241–45. http://dx.doi.org/10.1007/bf00692127.

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5

RAMIREZ, A. J., G. R. ACUFF, L. M. LUCIA, and J. W. SAVELL. "Lactic Acid and Trisodium Phosphate Treatment of Lamb Breast To Reduce Bacterial Contamination." Journal of Food Protection 64, no. 9 (September 1, 2001): 1439–41. http://dx.doi.org/10.4315/0362-028x-64.9.1439.

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Lactic acid and trisodium phosphate (TSP) were evaluated for the ability to reduce Escherichia coli and aerobic plate counts (APCs) on lamb breasts that were inoculated with a lamb fecal paste. A 90-s water rinse was applied followed by either a 9-s (55°C) 2% lactic acid spray, a 60-s (55°C) 12% TSP dip, or a combined treatment of both lactic acid and TSP treatments. Lactic acid reduced E. coli and APCs by 1.6 log10/cm2, and TSP caused a 1.8-log10/cm2 reduction in E. coli and a 0.7-log10/cm2 reduction in APCs. Combined reductions by the lactic acid spray followed by the TSP dip were 1.8 and 1.5 log10/cm2 for E. coli and APCs, respectively. Lactic acid and trisodium phosphate, used alone or in combination, were effective in reducing numbers of E. coli and could be useful as pathogen intervention steps in lamb slaughter processing.

6

Tan, Y., T. P. Hua, J. D. Tang, J. Wang, A. W. Liu, Y. R. Sun, C. F. Cheng, and S. M. Hu. "Self- and N₂- broadening of CO in the low-pressure regime." Journal of Physics: Conference Series 2439, no. 1 (January 1, 2023): 012007. http://dx.doi.org/10.1088/1742-6596/2439/1/012007.

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Abstract Sub-Doppler saturated absorption spectroscopy of rovibrational transitions of carbon monoxide broadened by nitrogen was recorded at low pressures (1-24 Pa) near 1.56 µm with comb-locked cavity ring-down saturation spectroscopy. We found a nonlinear pressure dependence of the Lamb-dip width of the CO transition induced by elastic scattering. Analysis of the results allows us to characterize parameters of elastic- and nonelastic- scattering under collisions. The elastic scattering angle for nitrogen-induced collisions (CO-N2) was determined to be larger than 0.6 × 10−3 rad. The line broadening of the Lamb dip in the region of low pressures exceeds the broadening at high pressures by a factor of 4 and 5 for the self- and N2-broadening CO R(9) transition. Moreover, much smaller line shifts for both self- and N2-broaden Lamb dips were observed, which was also attributed to the decrease in the number of scattered molecules in the interaction and the increasing attracting forces.

7

Alekseev, E., V. Ilyushin, V. Budnikov, M. Pogrebnyak, and L. Kniazkov. "MODERNIZATION OF THE KHARKIV MICROWAVE SPECTROMETER: CURRENT STATE." RADIO PHYSICS AND RADIO ASTRONOMY 28, no. 3 (2023): 257–70. http://dx.doi.org/10.15407/rpra28.03.257.

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Subject and Purpose. Results are presented of the recent considerable upgrade implemented at the Kharkiv microwave spectrometer. The upgrade has been aimed at extending the operating frequency range and increasing the utmost accessible spectral resolution of the spectrometer. Methods and Methodology. In order to extend the frequency range we have designed and constructed new BWO-based oscillator units, also providing for possibility of frequency tripler application. Construction of a new absorbing cell of enlarged diameter allowed us to considerably improve the spectral resolution for Lamb-dip measurements. Results. Owing to the upgrade, the spectrometer has become able to cover the frequency range from 34 to 420 GHz, with a gap from 183 to 200 GHz. The spectral resolution in the Lamb-dip observation mode has been increased by a factor of two. In addition, the functionality of the spectrometer has been significantly improved via modernization of several of its subsystems. Conclusions. The new upgrades of the spectrometer systems have permitted extending the operational frequency range and increasing the utmost accessible resolution by means of reducing the time-of-flight line broadening in the Lamb-dip measurements. In addition, application of square-wave frequency modulation with accurately known modulation parameters, in combination with careful modeling of the distortions caused by reflections in the absorbing cell, has allowed us to significantly improve the accuracy of line frequency measurements.

8

Taché, J. P., A. Le Floch, and R. Le Naour. "Lamb dip asymmetry in lasers with plane-parallel resonators." Applied Optics 25, no. 17 (September 1, 1986): 2934. http://dx.doi.org/10.1364/ao.25.002934.

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9

Oger, M., A. Daude, and A. Le Floch. "Frequency stability measurement on magnetic Lamb dip-stabilised lasers." Journal of Physics E: Scientific Instruments 22, no. 8 (August 1989): 618–23. http://dx.doi.org/10.1088/0022-3735/22/8/017.

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10

Golubiatnikov, G. Yu, S. P. Belov, I. I. Leonov, A. F. Andriyanov, I. I. Zinchenko, A. V. Lapinov, V. N. Markov, A. P. Shkaev, and A. Guarnieri. "Precision Sub-Doppler Millimeter and Submillimeter Lamb-Dip Spectrometer." Radiophysics and Quantum Electronics 56, no. 8-9 (January 2014): 599–609. http://dx.doi.org/10.1007/s11141-014-9464-2.

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Більше джерел

Дисертації з теми "Lamb-dip":

1

Elmaleh, Coralie. "Développement d’un prototype ultrasensible d’analyse de gaz dans le domaine submillimétrique." Electronic Thesis or Diss., Littoral, 2024. http://www.theses.fr/2024DUNK0698.

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Cette thèse explore le développement technologique d'une expérience spectroscopique dans le domaine submillimétrique, aussi connu sous le nom de Terahertz (THz). Cette bande spectrale se distingue par sa capacité à résoudre finement des doublets moléculaires, permettant une identification précise et claire de mélanges gazeux complexes, même lorsque d'autres longueurs d'onde pourraient échouer.Bien que la région THz offre un pouvoir de résolution exceptionnel, les spectromètres qui y opèrent sont souvent confrontés à des défis de sensibilité en raison du développement de la technologie dans cette bande. Grâce à une approche innovante, nous avons mis en œuvre la première expérience de Cavity ring-down Spectroscopy (CRDS) capable de quantifier des composés avec une précision allant jusqu’au ppb. L'étude est concentrée entre 550 GHz et 650 GHz, une fenêtre du spectre THz qui non seulement offre une résolution et une sensibilité moléculaire inégalées, mais possède aussi la capacité de pénétrer des matériaux non conducteurs tout en étant non ionisante. Ces propriétés positionnent cette technologie à la pointe des outils d'analyse, promettant une pléthore d'applications, allant de la recherche fondamentale à des applications industrielles
This thesis explores the technological development of a spectroscopic experiment in the submillimeter range, also known as Terahertz (THz). This spectral band stands out for its ability to precisely resolve molecular doublets, enabling clear and precise identification of complex gas mixtures, even when other wavelengths might fail.Although the THz region offers exceptional resolving power, spectrometers operating in this region often face sensitivity challenges due to the development of technology in this band. Thanks to an innovative approach, we have implemented the first Cavity Ring-Down Spectroscopy (CRDS) experiment capable of quantifying compounds to ppb precision. The study is concentrated between 550 GHz and 650 GHz, a window of the THz spectrum that not only offers unrivalled resolution and molecular sensitivity, but also possesses the ability to penetrate non-conducting materials while being non-ionizing. These properties position this technology at the cutting edge of analysis tools, promising a plethora of applications, from fundamental research to industrial applications

2

Lien, Yu-Hung, and 連育宏. "Frequency Stabilization of CO Laser using Optogalvanic Lamb-dip." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/67068159817199776625.

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Анотація:

博士
國立清華大學
物理學系
91
The optogalvanic spectroscopy of carbon monoxide moleucle (CO) and its application on frequency stabilization of CO laser are presented in the dissertation. Both DC and RF optogalvanic spectroscopy were studied and the saturation dip was pursued for the better frequency accuracy and stability. The DC optogalvanic spectroscopy was first studied in a low pressure discharge tube which the gas mixture of CO, N2 and various noble gases flowed through. The operating pressure was kept between 0.8 and 1.3 Torr to reduce the pressure broadening; the positive column region of the discharge was cooled to -60 C. The optimal S/N ratio was about 600 with the gas mixture CO : N2 : Ar = 1 : 84 : 11 and the total pressure was 1.344 Torr. No saturation dip was observed yet. It was believed that the pressure broadening should be responsible for the missing saturation dip. The RF optogalvanic spectroscopy was studied in order to lower operating pressure. There were three different RF circuits were constructed. Two of them were based on the design of Colpitts oscillator and one was based on a push-pull oscillator. Low or no nitrogen concentration was preferred for RF optogalvanic signal. All three circuits could operate down to 600 mTorr with little noise degradation. Cooling the discharge tube by spraying liquid nitrogen was once tested on Colpitts-I circuit and severely lowered the signal. The maximum S/N ratio was about 2190 for Colpitts-II circuit at amplitude modulation frequency 255 Hz. The saturation dip was observed by both Colpitts optogalvanic circuits and the depth was typically less than 5%. By wavelength modulation technique, the frequency of CO laser could be stabilized at the zero points, which was corresponding to the absorption line center of CO, of derivative spectroscopic signal. The limit of frequency stability was about 149 kHz and the practical stability was better than 300 kHz when the laser was stabilized by first order derivative spectroscopic signal. The third order derivative spectroscopic signal was also obtained but not used to stabilize laser frequency due to low S/N ratio. The extraordinary optogalvanic signals around some specific CO laser wavelengths were only found by Colpitts-II circuit. The origins of these extraordinary signals were discussed but yet identified. At last, the outlook of the experimental works is presented.

3

LIN, HAN-MING, та 林漢明. "Study of SF�� lamb dip using CW Co�疹aser". Thesis, 1992. http://ndltd.ncl.edu.tw/handle/28617310421104017637.

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4

CHEN, JIN-DONG, and 陳進東. "Frequency stabilization of a sequence band CO2 laser by radio frequency optogalvanic lamb dip." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/91032638827030958568.

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Частини книг з теми "Lamb-dip":

1

"Lamb-Dip Spectroscopy." In Fundamentals of Laser Physics, 49–59. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811265280_0005.

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Тези доповідей конференцій з теми "Lamb-dip":

1

Shy, Jow-Tsong, Chin-Chun Tsai, Tyson Lin, Chern-Yn Shieh, and Tsu-Chiang Yen. "CO2 laser frequency stabilization using rf optogalvanic Lamb dip." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wl20.

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Recently, Shy and Yen1,2 stabilized a CO2 laser at the Lamb dip using the optogalvanic signal in a dc glow discharge of low pressure N2-CO2 gas mixture. This method can be applied to regular, sequence- and hot-band laser transitions. However, it has several difficulties, e.g., it is not easy to have stable discharge at a pressure <500 mTorr and the signal-to-noise ratio (SNR) is strongly dependent on the conditions of cathode. In this paper, we present our results on the optogalvanic Lamb dip frequency stabilization of a CO2 laser using rf discharge. The experiments were carried out in a weak rf glow discharge driven by a Colpitts oscillator.3 The gas mixture (1:1 CO2-N2) slowly flowed through the cell at a pressure from 100 to 300 mTorr. The cell was outside the CO2 laser cavity. The Lamb dip signal was used to lock a waveguide CO2 laser with a frequency stability better than 1 × 109.

2

Voigt, R., M. Wienold, T. Alam, X. Lu, L. Schrottke, H. T. Grahn, and H. W. Hubers. "Lamb dip stabilization of a THz quantum-cascade laser." In 2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2021. http://dx.doi.org/10.1109/irmmw-thz50926.2021.9567333.

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3

Wienold, M., T. Alam, L. Schrottke, H. T. Grahn, and H. W. Hubers. "Lamb dip spectroscopy with a terahertz quantum-cascade laser." In 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, 2017. http://dx.doi.org/10.1109/irmmw-thz.2017.8067125.

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4

Shy, Jow-Tsong, Che-Chung Chou, Chern-Yn Shieh, Jin-Dong Chern, and Tsu-Chiang Yen. "Frequency stabilization and measurement of the sequence-band CO2 laser." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thj6.

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The sequence bands of the CO2 laser, which can be generated by placing a hot CO2 cell inside a CO2 laser cavity, provide a considerable increased number of laser lines with sufficient power to pump FIR lasers and for molecular spectroscopy. Shy and Yen have been able to lock a sequence-band laser to the line center using the optogalvanic Lamb dip with a low pressure N2-CO2 dc discharge.1 In this paper, we report two new line-center frequency stabilization methods for the sequence-band CO2 laser. For the first method, which we call rf optogalvanic Lamb dip, the dc discharge is replaced by an rf discharge. This method has certain advantages over the dc optogalvanic Lamb dip: lower pressure, lower operation voltage, no need of water cooling, and better SNR. The second method, saturated 4.3-µm fluorescence, utilizes the fact that the 4.3-µm fluorescence originating from the upper level of the sequence bands does not have the photon trapping effect. We use a longitudinal cell to collect the fluorescence. The cell is a Pyrex tube with inside coated with Al. By heating part of the cell to ~200°C, we were able to observe the saturation dip in the fluorescence signal and use its derivative signal to stabilize the laser. The stability is >100 kHz for both methods. Finally, we measured the beat frequency between a sequence-band laser stabilized by rf optogalvanic Lamb dip and a frequency stabilized regular CO2 laser, and nineteen sequence transition frequencies have been measured to an accuracy of 300 kHz.

5

Cheng, Cunfeng, Shui-Ming Hu, An-Wen Liu, Yu Sun, and Zitan Zhang. "LAMB DIP MEASUREMENTS OF MOLECULES WITH KHZ ACCURACY IN THE MID-INFRARED." In 74th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2019. http://dx.doi.org/10.15278/isms.2019.te03.

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6

Sakuma, Eiichi, Tomizo Kurosawa, and Atsushi Onae. "Stabilization Of CO 2 Laser By Using Lamb Dip From A Photo-Acoustic Cell." In 33rd Annual Techincal Symposium, edited by Irving J. Spiro. SPIE, 1990. http://dx.doi.org/10.1117/12.978613.

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7

Zhang, Minghui, Hui Sun, Tielin Sun, Wenjian Chen, and Tianhang Zhang. "Research on mode conversion of lamb wave at dip end face of elastic plate." In 2016 IEEE/OES China Ocean Acoustics (COA). IEEE, 2016. http://dx.doi.org/10.1109/coa.2016.7535722.

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8

Fearey, B. L., and B. M. Tissue. "High-resolution spectroscopy of Th and Pa isotopes." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.mkk7.

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Doppler-free spectroscopy has been performed on thorium and protactinium isotopes to gain a detailed understanding of the underlying physics of spectral features. Characterizing phenomena such as Lamb dips and optical pumping are important in understanding and optimizing resonance ionization mass spectrometry (RIMS) analysis. Measurement of these isotopes by RIMS is used in U-series disequilibrium dating of geological samples of the last 400,000 years. Isotope shifts and hyperfine structure of 232Th, 230Th, 229Th, 233Pa, and 231Pa are reported for several transitions. The Doppler-free spectra of Th showed an interesting effect, which was strongly dependent on laser power, in which a narrow peak replaced the usual Lamb dip. These results and a detailed analysis will be presented and discussed.

9

Castrillo, Antonio, Livio Gianfrani, Giuseppe Porzio, Stefania Gravina, and Eugenio Fasci. "FREQUENCY COMB ASSISTED, CAVITY RING-DOWN, LAMB-DIP SPECTROSCOPY OF ACETYLENE AT 1.39 μm." In 2021 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2021. http://dx.doi.org/10.15278/isms.2021.te07.

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10

Diouf, Meissa, Attila Császár, Roland Tóbiás, Cristina Puzzarini, Mattia Melosso, Wim Ubachs, Edcel Salumbides, and Frank Cozijn. "VIBRATIONAL LAMB-DIP SPECTROSCOPY OF WATER ISOTOPOLOGUES: HYPERFINE STRUCTURE IN H<sub>2</sub><sup>17</sup>O AND PERTURBATIONS IN HD<sup>16</sup>O." In 2021 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2021. http://dx.doi.org/10.15278/isms.2021.tk11.

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