Pub Date : 1992-10-31DOI: 10.1070/QE1992V022N10ABEH003630
S. V. Rulev, V. Shcheglov
A high concentration of radiation appears near the center of the convex mirror in the HSURIA axicon resonator. In this paper we discuss a method of reducing this concentration by extending the central cone of the W-axicon outward. We describe a more efficient algorithm for three-dimensional diffraction calculations on the field propagation in a cylindrical coordinate system by the stationary-phase method. We investigate the intensity of the highest-Q mode at the center of the convex mirror and the loss coefficient of lower modes of the resonator as a function of the distance which the central cone of the W-axicon extends outward.
{"title":"LASER TRACT ELEMENTS: Reducing the optical load and altering the mode content in the HSURIA axicon resonator","authors":"S. V. Rulev, V. Shcheglov","doi":"10.1070/QE1992V022N10ABEH003630","DOIUrl":"https://doi.org/10.1070/QE1992V022N10ABEH003630","url":null,"abstract":"A high concentration of radiation appears near the center of the convex mirror in the HSURIA axicon resonator. In this paper we discuss a method of reducing this concentration by extending the central cone of the W-axicon outward. We describe a more efficient algorithm for three-dimensional diffraction calculations on the field propagation in a cylindrical coordinate system by the stationary-phase method. We investigate the intensity of the highest-Q mode at the center of the convex mirror and the loss coefficient of lower modes of the resonator as a function of the distance which the central cone of the W-axicon extends outward.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84908837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-10-31DOI: 10.1070/QE1992V022N10ABEH003629
K. S. Korol'kov, A. Y. Krylov, O. Y. Nosach, E. P. Orlov
We have developed a new method for measuring the cross section for the 52P1/2→52P3/2 transition of atomic iodine in photodissociation lasers. The inverse recombination of iodine atoms is monitored via dynamic self-diffraction of the laser radiation in the active medium. We have measured the cross section in mixtures of H-C3F7I and CF3I with Xe. This new method substantially increases the accuracy with which the cross section can be measured. Our results are highly reproducible, with a dispersion of no more than 3%.
{"title":"A more accurate method of measuring the cross section for the 52P1/2→52P3/2 transition of atomic iodine in photodissociation lasers based on dynamic self-diffraction","authors":"K. S. Korol'kov, A. Y. Krylov, O. Y. Nosach, E. P. Orlov","doi":"10.1070/QE1992V022N10ABEH003629","DOIUrl":"https://doi.org/10.1070/QE1992V022N10ABEH003629","url":null,"abstract":"We have developed a new method for measuring the cross section for the 52P1/2→52P3/2 transition of atomic iodine in photodissociation lasers. The inverse recombination of iodine atoms is monitored via dynamic self-diffraction of the laser radiation in the active medium. We have measured the cross section in mixtures of H-C3F7I and CF3I with Xe. This new method substantially increases the accuracy with which the cross section can be measured. Our results are highly reproducible, with a dispersion of no more than 3%.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83521604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003608
A. V. Belinskii
An investigation is made of the evolution of quantum fluctuations of a fundamental soliton in the course of its propagation in a nonlinear fiber waveguide characterized by losses and compensated by amplification. Simple relationships are obtained for the amplitude and phase noise, quantum uncertainty of the position and momentum, and also fluctuations of the quadrature components of the radiation field. Numerical estimates are obtained. It is shown that loss-compensating amplification is unnecessary for efficient formation of squeezed states of a soliton.
{"title":"Schrödinger soliton in a fiber waveguide exhibiting both gain and losses: squeezed states and growth of noise in the linear approximation","authors":"A. V. Belinskii","doi":"10.1070/QE1992V022N09ABEH003608","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003608","url":null,"abstract":"An investigation is made of the evolution of quantum fluctuations of a fundamental soliton in the course of its propagation in a nonlinear fiber waveguide characterized by losses and compensated by amplification. Simple relationships are obtained for the amplitude and phase noise, quantum uncertainty of the position and momentum, and also fluctuations of the quadrature components of the radiation field. Numerical estimates are obtained. It is shown that loss-compensating amplification is unnecessary for efficient formation of squeezed states of a soliton.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74279705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003597
A. Dem’yanov, I. Kochetov, A. Napartovich, M. Capitelli, C. Gorse, S. Longo
Theoretical models developed independently by groups in Russia and Italy were used to describe the operation of a 10-liter electric-discharge XeCl laser. The calculations gave similar results for an HCl pressure of 1.5 Torr, but diverged strongly at low (0.5 Torr) and high (4 Torr) HCl pressures. The reasons for this discrepancy were determined. It was found that homogeneous models cannot describe the experimental data satisfactorily.
{"title":"LASERS: Modeling of a 10-liter electric-discharge XeCl laser","authors":"A. Dem’yanov, I. Kochetov, A. Napartovich, M. Capitelli, C. Gorse, S. Longo","doi":"10.1070/QE1992V022N09ABEH003597","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003597","url":null,"abstract":"Theoretical models developed independently by groups in Russia and Italy were used to describe the operation of a 10-liter electric-discharge XeCl laser. The calculations gave similar results for an HCl pressure of 1.5 Torr, but diverged strongly at low (0.5 Torr) and high (4 Torr) HCl pressures. The reasons for this discrepancy were determined. It was found that homogeneous models cannot describe the experimental data satisfactorily.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91523553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003598
V. A. Bazylev, A. Tulupov
A theoretical interpretation is given of the effects in a free-electron laser with a longitudinal magnetic field oriented the opposite to the electron beam.
对纵向磁场方向与电子束方向相反的自由电子激光器中的效应作了理论解释。
{"title":"Free-electron lasers with an oppositely directed longitudinal magnetic field","authors":"V. A. Bazylev, A. Tulupov","doi":"10.1070/QE1992V022N09ABEH003598","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003598","url":null,"abstract":"A theoretical interpretation is given of the effects in a free-electron laser with a longitudinal magnetic field oriented the opposite to the electron beam.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90728726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003599
G. É. Nekrasova, M. V. Pyatakhin
A multimode laser with a dynamic system typical of intracavity laser spectroscopy is analyzed allowing for a mechanism that may possibly flatten the stimulated emission spectrum when stimulated Brillouin scattering (STBS) occurs in the active medium. A numerical analysis of the dynamics of such a laser is carried out in terms of kinetic equations. It is found that STBS in an active medium shifts the lasing spectrum with time in the direction of the red wavelengths. The time needed for the establishment of dips in the emission spectrum of a laser, corresponding to narrow-band absorption lines, decreases on increase in the nonlinearity, but the relative depth of the dips decreases. An effect similar to the condensation of the spectrum in the vicinity of an absorption line is predicted.
{"title":"Dynamics of stimulated emission from a multimode laser considered allowing for stimulated Brillouin scattering","authors":"G. É. Nekrasova, M. V. Pyatakhin","doi":"10.1070/QE1992V022N09ABEH003599","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003599","url":null,"abstract":"A multimode laser with a dynamic system typical of intracavity laser spectroscopy is analyzed allowing for a mechanism that may possibly flatten the stimulated emission spectrum when stimulated Brillouin scattering (STBS) occurs in the active medium. A numerical analysis of the dynamics of such a laser is carried out in terms of kinetic equations. It is found that STBS in an active medium shifts the lasing spectrum with time in the direction of the red wavelengths. The time needed for the establishment of dips in the emission spectrum of a laser, corresponding to narrow-band absorption lines, decreases on increase in the nonlinearity, but the relative depth of the dips decreases. An effect similar to the condensation of the spectrum in the vicinity of an absorption line is predicted.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89566962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003595
A. Denisov, A. I. Zagumennyi, G. Lutts, V. Osiko, S. G. Semenkov, A. Umyskov
An investigation was made of the possibility of lasing of Ho3+ ions in a Yb3Sc2Ga3O12:Cr3+:Ho3+ crystal in accordance with a cascade scheme 5I6→5I7→5I8 using flashlamp pumping at room temperature. The lifetime of the 2F5/2 level of the Yb3+ ion and of the 5I6 and 5I7 levels of the Ho3+ ion were determined. The efficiency of the Cr3+→Yb3+→Ho3+ energy transfer chain was 60%.
{"title":"CRYSTALS OF YB3SC2GA3O12:CR3+:HO3+ AS A PROMISING MATERIAL FOR CASCADE LASING OF HO3+ IONS","authors":"A. Denisov, A. I. Zagumennyi, G. Lutts, V. Osiko, S. G. Semenkov, A. Umyskov","doi":"10.1070/QE1992V022N09ABEH003595","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003595","url":null,"abstract":"An investigation was made of the possibility of lasing of Ho3+ ions in a Yb3Sc2Ga3O12:Cr3+:Ho3+ crystal in accordance with a cascade scheme 5I6→5I7→5I8 using flashlamp pumping at room temperature. The lifetime of the 2F5/2 level of the Yb3+ ion and of the 5I6 and 5I7 levels of the Ho3+ ion were determined. The efficiency of the Cr3+→Yb3+→Ho3+ energy transfer chain was 60%.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78215884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003615
V. Gorbachev, V. Gorokhov, A. V. Kalutskii, V. Karelin, V. Korolev, V. I. Smerdov
An MF-14 photodiode array was used to determine the radiation field of pulsed ultraviolet lasers. The responsivity of this array at the wavelength of 0.337 μm was S = 4 × 108 V/J. The distributions of the radiation from an N2 laser were determined in the near-field zone. The distributions were also obtained for XeF, XeCl, and KrF excimer lasers in the far-field zone. The angular dimensions of the distributions were determined.
{"title":"APPLICATIONS OF LASERS AND OTHER TOPICS IN QUANTUM ELECTRONICS: Determination of the spatial characteristics of the radiation emitted by pulsed ultraviolet lasers using a photodiode array","authors":"V. Gorbachev, V. Gorokhov, A. V. Kalutskii, V. Karelin, V. Korolev, V. I. Smerdov","doi":"10.1070/QE1992V022N09ABEH003615","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003615","url":null,"abstract":"An MF-14 photodiode array was used to determine the radiation field of pulsed ultraviolet lasers. The responsivity of this array at the wavelength of 0.337 μm was S = 4 × 108 V/J. The distributions of the radiation from an N2 laser were determined in the near-field zone. The distributions were also obtained for XeF, XeCl, and KrF excimer lasers in the far-field zone. The angular dimensions of the distributions were determined.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88772620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003612
N. K. Makashev, E. S. Asmolov, V. Blinkov, A. Boris, O. Buzykin, A. Burmistrov, M. R. Gryaznov, V. Makarov
A quantitative physical model of metal cutting by cw laser radiation in the absence of chemical reactions was developed. An experimental study was made of the flow of the processing gas using a geometrically similar model. The distributions of the pressure and velocity of the gas were determined at the cutting front. Simplified mathematical algorithms for the thermal problem were constructed and calculations were made of the maximum depth of the cut (kerf) and cutting speed as functions of the laser beam parameters. Possible nonsteady-state characteristics of the motion of the melt and of the cutting front were considered. A thermal mechanism was proposed for the formation of the regular rippling of the kerf, based on a balance between capillary forces and forces exerted on the melt by the gas stream in the vicinity of the upper edge of the cutting front. Simple formulas were obtained for calculating the depth and period of the ripples.
{"title":"Gas hydrodynamics of metal cutting by cw laser radiation in a rare gas","authors":"N. K. Makashev, E. S. Asmolov, V. Blinkov, A. Boris, O. Buzykin, A. Burmistrov, M. R. Gryaznov, V. Makarov","doi":"10.1070/QE1992V022N09ABEH003612","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003612","url":null,"abstract":"A quantitative physical model of metal cutting by cw laser radiation in the absence of chemical reactions was developed. An experimental study was made of the flow of the processing gas using a geometrically similar model. The distributions of the pressure and velocity of the gas were determined at the cutting front. Simplified mathematical algorithms for the thermal problem were constructed and calculations were made of the maximum depth of the cut (kerf) and cutting speed as functions of the laser beam parameters. Possible nonsteady-state characteristics of the motion of the melt and of the cutting front were considered. A thermal mechanism was proposed for the formation of the regular rippling of the kerf, based on a balance between capillary forces and forces exerted on the melt by the gas stream in the vicinity of the upper edge of the cutting front. Simple formulas were obtained for calculating the depth and period of the ripples.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84017493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1992-09-30DOI: 10.1070/QE1992V022N09ABEH003596
N. Gavrilenko, V. D. Kurnosov, O. Semenova, S. K. Taktashov, R. V. Chernov, Yu P Chetkin
Theoretical and experimental investigations were made of an ILPN-216A semiconductor emitter operating at 1.3 μm. A feature of the design of this emitter was a laser diode with an external resonator as the active element. The calculations were in good agreement with the experimental values of the mode intensity in the cw and pulsed regimes. In the pulsed regime when the ILPN-216A emitter was pumped additionally by a continuous threshold current, a single-frequency radiation spectrum was obtained and the ratio of the emitted mode to the adjacent mode was at least 20 dB.
{"title":"DYNAMICS OF EMISSION FROM A SEMICONDUCTOR LASER WITH AN EXTERNAL RESONATOR","authors":"N. Gavrilenko, V. D. Kurnosov, O. Semenova, S. K. Taktashov, R. V. Chernov, Yu P Chetkin","doi":"10.1070/QE1992V022N09ABEH003596","DOIUrl":"https://doi.org/10.1070/QE1992V022N09ABEH003596","url":null,"abstract":"Theoretical and experimental investigations were made of an ILPN-216A semiconductor emitter operating at 1.3 μm. A feature of the design of this emitter was a laser diode with an external resonator as the active element. The calculations were in good agreement with the experimental values of the mode intensity in the cw and pulsed regimes. In the pulsed regime when the ILPN-216A emitter was pumped additionally by a continuous threshold current, a single-frequency radiation spectrum was obtained and the ratio of the emitted mode to the adjacent mode was at least 20 dB.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89861251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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