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中文摘要：
通过对基于轴棱锥的贝塞尔谐振腔和贝塞尔-高斯谐振腔的研究,设计了一台腔内倍频Nd：YAG纳秒近似无衍射贝塞尔绿光激光器.非稳激光器谐振腔由轴棱锥和凸面镜组成.实验采用单灯脉冲抽运激光增益介质Nd：YAG晶体,倍频晶体选用KTP.当抽运电压为350V时,由主动式直接产生纳秒近似零阶贝塞尔绿光,其脉冲宽度为55.1ns,波长为532nm,线宽为0.8nm,近似无衍射零阶贝塞尔绿光的中心光斑直径为192μm.利用Fresnel-Kirchhoff衍射积分和Fox-Li迭代法,通过数值计算得出了谐振腔的稳定场分布.实验结果与理论模拟基本符合.
英文摘要：
An intracavity frequency-doubled Nd∶ YAG nanosecond Bessel green laser is designed in an axicon-based Bessel and Bessel-Gaussian resonator. The unstable laser resonator is composed of a refraction axicon and a convex mirror. The gain medium Nd∶ YAG rod is pumped by a single flash-lamp which is working in a pulsed mode and a KTP crystal is used for intracavity second-harmonic generation. Nanosecond Bessel green beam is generated directly from the laser by active method when pumping voltage is 350 V. The pulse with width of 55. 1 ns,central wavelength at 532 nm,spectral line width of 0. 8 nm and diameter of central spot of 192 μm is obtained. Fresnel-Kirchhoff diffraction integral and the Fox-Li algorithm is used to extract the dominant mode of the cavity and the experimental results are consistent with those of the numerical simulation.
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Spectral and polarization properties of stochastic electromagnetic beams propagating in gain or abso
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