STIMULATED BRILLOUIN SCATTERING OF CO_2 LASER RADIATION IN COMPRESSED XENON

摘要

Stimulated Brillouin scattering (SBS) and wave front phase conjugation of CO_2 laser radiation in compressed xenon (59 atm at 21℃), placed into low Q resonator of this same laser has been demonstrated experimentally for the first time. The action on nonlinear medium was carried out by opposing focussed beams of multimode radiation. The difference in resonator longitudinal mode frequencies was set equal to the frequency of the acoustic wave (v_s = 32.2 +- 0.3 MHz) excited by the radiation with 9.584 μm wavelength at SBS. Radiation pulse duration (τ_L) was close to acoustic phonon lifetime (τ_L <τ_(ph) ≈ 3*10~(-6) s). In experiments the SBS excitation was manifested longitudinal mode synchronizing, power and energy rise and also in increasing laser radiation oscillation duration and in decreasing divergence to diffraction limit.