Pub Date : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003666
A. B. Aleksandrov, P. P. Inshin
Signals proportional to components of the gradient of the sharpness function can be generated by optical methods. A numerical simulation indicates that this approach would be effective in work with low light fluxes, for which quantum detection effects are important.
{"title":"Adaptive control based on the discrimination of the sharpness-function gradient in an optical process","authors":"A. B. Aleksandrov, P. P. Inshin","doi":"10.1070/QE1992V022N11ABEH003666","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003666","url":null,"abstract":"Signals proportional to components of the gradient of the sharpness function can be generated by optical methods. A numerical simulation indicates that this approach would be effective in work with low light fluxes, for which quantum detection effects are important.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81778864","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003671
S. Babin, S. Rautian, D. Shapiro
Coulomb broadening in a three-level system is studied. Interference resonances are not broadened by collisions, differing from saturation resonances in this regard. Experimental spectra of generation on adjacent ion transitions and resonance fluorescence are interpreted. An increase in the output power of ion Raman lasers is predicted.
{"title":"Three-level nonlinear spectroscopy of Coulomb collisions","authors":"S. Babin, S. Rautian, D. Shapiro","doi":"10.1070/QE1992V022N11ABEH003671","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003671","url":null,"abstract":"Coulomb broadening in a three-level system is studied. Interference resonances are not broadened by collisions, differing from saturation resonances in this regard. Experimental spectra of generation on adjacent ion transitions and resonance fluorescence are interpreted. An increase in the output power of ion Raman lasers is predicted.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74924813","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003661
M. Belov, M. A. Selifanov, E. Manykin
We investigate the phenomenon of self-diffraction in optically dense media for those cases where it is necessary to take into account the inverse effect of the medium on the field. Our study is based on a numerical analysis of the Maxwell–Bloch equations. This analysis reveals that, as the concentration of two-level systems increases, an anomalous response of four-wave mixing arises. This response is associated with the appearance of a self-diffraction signal in the negative-delay region and also with a faster decay of coherence in the system.
{"title":"Self-diffraction in optically dense media","authors":"M. Belov, M. A. Selifanov, E. Manykin","doi":"10.1070/QE1992V022N11ABEH003661","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003661","url":null,"abstract":"We investigate the phenomenon of self-diffraction in optically dense media for those cases where it is necessary to take into account the inverse effect of the medium on the field. Our study is based on a numerical analysis of the Maxwell–Bloch equations. This analysis reveals that, as the concentration of two-level systems increases, an anomalous response of four-wave mixing arises. This response is associated with the appearance of a self-diffraction signal in the negative-delay region and also with a faster decay of coherence in the system.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80494751","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003656
O. Kulagin, P. B. Potlov, A. Shilov
We have conducted an experimental study of phase conjugation of microsecond laser pulses via forward Brillouin scattering in the field of two intersecting pump beams whose transverse structures closely resemble that of a single mode. We have demonstrated that an interaction can take place at relatively low pump power densities. It thus becomes possible to achieve phase conjugation of long pulses without competition from thermal self-effects.
{"title":"NONLINEAR OPTICS PHENOMENA: Phase conjugation of microsecond pulses by forward Brillouin scattering","authors":"O. Kulagin, P. B. Potlov, A. Shilov","doi":"10.1070/QE1992V022N11ABEH003656","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003656","url":null,"abstract":"We have conducted an experimental study of phase conjugation of microsecond laser pulses via forward Brillouin scattering in the field of two intersecting pump beams whose transverse structures closely resemble that of a single mode. We have demonstrated that an interaction can take place at relatively low pump power densities. It thus becomes possible to achieve phase conjugation of long pulses without competition from thermal self-effects.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89554406","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003670
M. A. Bolshtyanskii, B. Zel'dovich, Yu. E. Kapitskii, A. Savchenko, V. Churikov
The tensor properties of χ(2) gratings written in bulk glass have been studied for various polarization conditions. Three basic cases were studied: the writing of gratings by waves with parallel polarizations, perpendicular polarizations, and polarizations making an angle of 45°. The results indicate that a static electric field proportional to (EE)E is written.
{"title":"Effect of polarization on the properties of an induced χ(2) tensor in bulk glass","authors":"M. A. Bolshtyanskii, B. Zel'dovich, Yu. E. Kapitskii, A. Savchenko, V. Churikov","doi":"10.1070/QE1992V022N11ABEH003670","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003670","url":null,"abstract":"The tensor properties of χ(2) gratings written in bulk glass have been studied for various polarization conditions. Three basic cases were studied: the writing of gratings by waves with parallel polarizations, perpendicular polarizations, and polarizations making an angle of 45°. The results indicate that a static electric field proportional to (EE)E is written.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88380599","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003657
V. A. D'yakov, S. A. Korol’kov, A. V. Mamaev, V. Shkunov
We have investigated backward stimulated diffusive scattering of light with a time-varying speckle structure by photorefractive crystals in which the nonlinearity mechanism is diffusion-driven. We show that the efficiency and conjugated fraction for this process depend on the ratio of the coherence time to the dielectric relaxation time of the medium.
{"title":"Self-conjugation of pump waves with \"boiling\" speckle structure via backward stimulated diffusive scattering in an Fe:KNbO3 crystal","authors":"V. A. D'yakov, S. A. Korol’kov, A. V. Mamaev, V. Shkunov","doi":"10.1070/QE1992V022N11ABEH003657","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003657","url":null,"abstract":"We have investigated backward stimulated diffusive scattering of light with a time-varying speckle structure by photorefractive crystals in which the nonlinearity mechanism is diffusion-driven. We show that the efficiency and conjugated fraction for this process depend on the ratio of the coherence time to the dielectric relaxation time of the medium.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85125534","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003665
A. Starodumov
A new method for producing light pulses with an ultrahigh repetition frequency is proposed. The method is based on counterpropagating four-wave mixing in an optical fiber. The information is coded at low repetition frequencies, and the pulse train is compressed in time. The effect would be to raise the repetition frequency to 1011–1012 Hz.
{"title":"New method of pulse train compression","authors":"A. Starodumov","doi":"10.1070/QE1992V022N11ABEH003665","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003665","url":null,"abstract":"A new method for producing light pulses with an ultrahigh repetition frequency is proposed. The method is based on counterpropagating four-wave mixing in an optical fiber. The information is coded at low repetition frequencies, and the pulse train is compressed in time. The effect would be to raise the repetition frequency to 1011–1012 Hz.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80362412","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003646
A. Gal, V. Rusanov, V. L. Shiryaevskii, G. Sholin
We investigated the spectral characteristics of an SF6–HI–H2 laser pumped by an electron beam. The time-integrated output spectrum was studied as a function of the composition of the hydrogen-containing component of the working mixture. Lasing takes place under conditions far from rotational equilibrium.
{"title":"OUTPUT SPECTRAL CHARACTERISTICS OF A PULSED HF CHEMICAL LASER USING AN SF6-HI-H2 MIXTURE AND ELECTRON-BEAM PUMPING","authors":"A. Gal, V. Rusanov, V. L. Shiryaevskii, G. Sholin","doi":"10.1070/QE1992V022N11ABEH003646","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003646","url":null,"abstract":"We investigated the spectral characteristics of an SF6–HI–H2 laser pumped by an electron beam. The time-integrated output spectrum was studied as a function of the composition of the hydrogen-containing component of the working mixture. Lasing takes place under conditions far from rotational equilibrium.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89835585","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003660
O. Lyubomudrov, V. Shkunov
We find the theoretical threshold for phase conjugation of a pump beam with speckle structure by a double photorefractive phase conjugate mirror based on transmitting and reflecting gratings of a diffusion type. For a speckle beam the nonlinear dependence of the profile of light-induced optical nonuniformity on the local intensity profile reduces the readout efficiency and raises the threshold by as much as a factor of 1.5.
{"title":"Threshold for conjugation of speckle beams by a double phase conjugate mirror","authors":"O. Lyubomudrov, V. Shkunov","doi":"10.1070/QE1992V022N11ABEH003660","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003660","url":null,"abstract":"We find the theoretical threshold for phase conjugation of a pump beam with speckle structure by a double photorefractive phase conjugate mirror based on transmitting and reflecting gratings of a diffusion type. For a speckle beam the nonlinear dependence of the profile of light-induced optical nonuniformity on the local intensity profile reduces the readout efficiency and raises the threshold by as much as a factor of 1.5.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87689363","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 : 1992-11-30DOI: 10.1070/QE1992V022N11ABEH003650
A. Apolonskii, E. Zinin, A. Kuklin, S. D. Shchebetov
The position of the light pulses on the period of the modulating function has been measured as a function of the discharge current, the resonator length, and other parameters for an argon laser with active mode locking. These measurements were carried out for various emission lines in the visible and UV regions. At a minimum pulse length, and at a pump level well above the threshold for lasing, the losses in the mode locker are high. The reasons for the difficulties encountered in attempts to achieve simultaneous mode locking of the 488.0- and 514.5-nm lines are pointed out. The evolution of the pulse shape (from the point of appearance to the point of disappearance) as the basic laser parameters are varied has been studied. The pulses are at their shortest when there is a satellite, rather than under single-pulse conditions. The experimental data are consistent with a model of supermodes.
{"title":"MODE LOCKING OF AN ION LASER BY MEANS OF A DISSECTOR","authors":"A. Apolonskii, E. Zinin, A. Kuklin, S. D. Shchebetov","doi":"10.1070/QE1992V022N11ABEH003650","DOIUrl":"https://doi.org/10.1070/QE1992V022N11ABEH003650","url":null,"abstract":"The position of the light pulses on the period of the modulating function has been measured as a function of the discharge current, the resonator length, and other parameters for an argon laser with active mode locking. These measurements were carried out for various emission lines in the visible and UV regions. At a minimum pulse length, and at a pump level well above the threshold for lasing, the losses in the mode locker are high. The reasons for the difficulties encountered in attempts to achieve simultaneous mode locking of the 488.0- and 514.5-nm lines are pointed out. The evolution of the pulse shape (from the point of appearance to the point of disappearance) as the basic laser parameters are varied has been studied. The pulses are at their shortest when there is a satellite, rather than under single-pulse conditions. The experimental data are consistent with a model of supermodes.","PeriodicalId":21878,"journal":{"name":"Soviet Journal of Quantum Electronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1992-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89322303","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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