The influence of thermal deformation processes on the phase-matching temperature bandwidth of nonlinear frequency conversion in different uniaxial and biaxial crystals is determined by using the results of calculations and experimental measurements. It is shown that the temperature bandwidths in borate crystals differ considerably in the case of different methods of nonlinear crystal fixation.
Optical linear and nonlinear properties of AgGaGexS2(1+x), Hg(1-x)CdxGa2S4, LiInSe2, and LiInS2 non-linear crystals are investigated in details so as their potential in frequency conversion of femtosecond pulses for lidar applications.
Results on investigation of linear and non-linear optical properties, damage threshold and potential efficiencies of biaxial LiInS2 crystal are represented. Transmission range is 0.4 - 12.5 micrometers at the 0.1 level and 0.5 - 11.0 micrometers at the 0.5 level. Typical absorption coefficients are as low as 0,1 - 0,25 cm-1 at the maximum transmission range 1.0 - 8.0 micrometers and 1.1 - 2.3 cm-1 at the CO2 laser wavelengths. Coefficients of second order non-linear susceptibilities are d31 equals 6.2, d32 equals 5.4 and d33 equals 9.8 pm/V, but damage threshold is as high as 120 - 130 MW/sm2 for 36 ns pulses at 9.55 micrometers . The phase-matching is estimated with using of determined Sellmeier coefficients. It is represented in graphic form so as fields of SHG efficiencies. It is shown that LiInS2 can be used in middle IR OPO pumped by Cu-vapor laser, group-velocity phase matching take place in wide spectral range for sum- and difference-frequency generation of visible, near and middle IR lasers including SHG of 3 micrometers Er laser.
The results of theoretical analysis of multifrequency optical harmonics generation in the nonlinear crystals with regular domain structure for all types of interaction (approximately 4000 combinations) are represented. The different variants of quasiphase matching for OPO with multiple frequencies are considered.
The results of investigation and development method for multi-cascade pulsed solid-state lasers optical schemes are represented. The analysis of processes for lasers with active and passive Q-switch was made. It is shown the variation of output laser parameters versus the inter- cascade coupling.
The results of a comparison analysis of the laser radiation harmonic generation in biaxial crystals for all types of interaction are represented. The calculation of the phase- matching angles, bandwidths (angular, spectral, temperature), `field' of effective nonlinearities, phase- matching curves and etc. have been carried out.
It is about development and use of packs of applied programs for researches and development of pulse solid state lasers and training of specialists on IBM PC/AT compatible computers. Base of work prescribes the technology of creation to adequate experiment of mathematical model for subsequent theoretical researches and development of laser devices with given output parameters.
The theoretical and experimental investigation results for the regenerative regime of the 4- passes YAG:Nd laser amplifier with phase conjugation SBS mirror are presented. The role of the abnormal dispersion and Kerr nonlinearity of the active element on the forming of the output radiation parameters are shown. The gain of the amplifier 2.5 multiplied by 104 was obtained experimentally.
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