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从虚共焦非稳定谐振腔的激光场出发,考虑谐振腔反射镜热畸变对光束的影响,利用快速傅里叶变换(FFT)研究激光光束在湍流大气中的传输特性。着重分析了反射镜热畸变对环形强化学氧碘激光在湍流大气中传输产生的影响,给出了在大气湍流影响下激光光束传输不同距离的强度分布。利用β参数和Strehl比来评价光束质量的特性,结果表明:随着传输距离的增加,光束能量向外扩展,最高能量减小,光束质量被大大地削弱;同时,在大气湍流较弱的情况下,热畸变对光束质量的影响比较明显。在大气条件相同的情况下,传输距离一定时,反射镜热畸变越大,光束质量越差。
Starting from the laser field of the virtual confocal unstable resonator, the influence of the thermal distortion of the resonator mirror on the beam is considered, and the transmission characteristics of the laser beam in the turbulent atmosphere are studied by fast Fourier transform (FFT). The influence of the thermal distortion of the mirror on the transmission of the annular strong chemical oxygen-iodine laser in a turbulent atmosphere is emphatically analyzed. The intensity distribution of the laser beam transmitting at different distances under the influence of atmospheric turbulence is given. The characteristics of the beam quality were evaluated by using the beta parameter and the Strehl ratio. The results show that the beam energy expands outwardly with the maximum energy decreases and the beam quality is greatly weakened with the increase of the transmission distance. Meanwhile, when the atmospheric turbulence is weak Under the influence of thermal distortion on the beam quality is obvious. Under the same atmospheric conditions, the transmission distance is constant, the greater the thermal distortion of the mirror, the worse the beam quality.