&lt;title&gt;Powerful photodissociation laser with high-quality phase conjugation&lt;/title&gt;

Dolgopolov, Yu. V.; Dudov, A. M.; Zykov, L. I.; Kirillov, G. A.; Кочемасов, Г. Г.; Kulikov, S. M.; Murugov, Vasili M.; Sukharev, S. A.; Shkapa, A. F.

doi:10.1117/12.183089

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“…(5) the time derivative is neglected and the obtained solution for the amplitude ofpolarization is inserted in Eq. (4). It is to be taken into account as well that in the EPDL with a SBS mirror along with the laser field the Stokes radiation is amplified too that is reflected from the SBS mirror and has a frequency shift and, correspondingly, other gain conditions.…”

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confidence: 99%

“…The latter is very important because in usual PC mirrors a close to ideal quality of PC in focused beams can be obtained only at high reflection coefficients, which is connected with a danger that some competing processes may develop in the SBS medium. Calculations for the SBS mirror geometry optimization [1][2][3][4][5][6][7][8][9][10][11][12][13] showed a good agreement with the experimental data on the reflection and transmission coefficients of the angular selector obtained under laboratory conditions, detailed description of which is given in work 14 The calculated quality of PC under various configurations of the SBS mirror was confirmed by detailed experimental comparison ofthe laser and Stokes energy distributions in the near field.…”

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confidence: 99%

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Explosively pumped photodissociation iodine laser with phase conjugation of super-high quality: modeling and experiment

Starikov¹,

Dolgopolov²,

Dudov³

et al. 2003

International Conference on Lasers, Applications, and Technologies 2002: Advanced Lasers and Systems

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A non-steady-state theoretical and mathematical model and a complex of computer codes have been developed for modeling a high-power double-pass explosively pumped photo-dissociation iodine laser (EPDL) with phase conjugation (PC) at SBS. The model and the complex of codes taking into account three-dimensionality of space consist of two blocks. The first block is devoted to detailed modeling of the SBS mirror consisting of an angular selector of Stokes radiation, an ordered raster of small diffraction lenses, a main focusing lens, and a SBS cell. The second block describes the dynamics of radiation in the laser system as a whole with using SBS mirror parameters calculated in the first block. The model takes into account parasitic reflections of laser radiation from the elements of the optical scheme, intrinsic amplified spontaneous emission ofthe amplifiers, radiation losses in the optical path, non-uniformity ofgain, and radiation refraction on optical non-uniformities of the active medium caused by a shock wave. As a result of calculations an optimal configuration of the SBS mirror has been determined, possessing unique properties if compared to the existing specimens of the SBS mirrors. It stably gives a nearly ideal quality of PC at any level of SBS saturation, i.e. any reflection coefficient that is confirmed by experimental laboratory investigations. Modeling of the laser system as a whole at working mixture 25 Torr C3F71+125 Torr Xe and amplifier aperture 15 cm has been shown a good agreement of calculated results with available experimental data in energy, time dependence of power and Strehl number of output radiation. The considered EPDL has output energy of about 400 J and brightness of about 1012J/ster. It is shown that parasitic reflections of laser radiation from the ends of amplifiers and elements of the optical scheme with a coefficient exceeding iO-7 considerably decrease the brightness of EPDL. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/25/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 5137 173 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/25/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: ]mentioning

confidence: 99%