As the development of the laser-driven technology, the next generation of laser-driven device sets higher requirement for the repetition frequency. The higher repetition gives rise to thermal deposition, which induces thermo-optical effect, elasto-optical effect and bulk displacement. The thermal efficient management is an important approach to dissolve the thermal deposition. The quasi uniform distribution of heat medium is realized by helium cooling Nd:glass slab and the control of edge temperature. In the case, wavefront distortion and depolarization losses is obtained in experiment. Results said that both of them are improved greatly. At the same time, the distribution of temperature, stress and strain and stress birefringence in Nd:glass are analyzed by using finite element numerical simulation method. And the calculation results show that the wavefront distortion and depolarization losses match with the experimental results very well.
In order to broaden the spectrum of laser pulse and reduce the gain narrowing effect in Nd:glass regenerative amplifier to
realize the ambition of inhibiting amplitude and frequency modulation, proper quartz birefringence crystal plate is inserted
into the cavity. The influence factors of central wavelength, depth of modulation and range of modulation are obtained
theoretically. The width of the spectrum is broadened by controlling all the factors. Two kinds of thickness, 5mm and
6mm, are inserted into the regenerative amplifier cavity. The results of theoretical calculation and experiment both show
that the effect of spectrum widening is evident, which reduces the gain narrowing effect to some extent. The amplitude and
frequency modulation resulted from gain narrowing effect is inhibited when the central wavelength deflects. The simulated
results show that inhibited effect of amplitude and frequency modulation is remarkable. And the method is a potential
effective technique for amplitude and frequency modulation inhibition.
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