非稳腔的远场光强分布和光束质量

The far field intensity distribution and beam quality of unstable resonators

在对远场光强分布分析的基础上，对非稳腔的光束质量作了详细研究。证明了当遮拦比ε→１ 时，其远场光强是零阶贝塞尔光束分布。对数值计算结果的物理分析表明：用“桶中功率”曲线是评价非稳腔远场光束质量适用的方法。同时，也指出了这种方法的不足之处。

Based on the analysis of the far field intensit y distribution,the beam quality of unstable resonators has been studied in detai l.It has been proven that the intensity in the far field of unstable resonato rs is the zeroth order Bessel beam distribution,if the obscure ratio ε →1.N umerical calculation and analysis have shown that the “power in the bucket” cu rve is a suitable method used to characterize the beam quality in the far field of unstable resonators.Meanwhile,the shortcomings of this method have been poin ted out.