超连续谱激光光束质量评价及提升方法

Evaluation and improvement of beam quality of supercontinuum laser

针对超连续谱的光束特性,分析了各种光束质量评价方法对超连续谱激光器输出光束质量评价的适用性,并综合各个评价方法的优缺点,找到一种最适合超连续谱光束质量的评价方法。要提高超连续谱激光光束质量,可以从两方面入手:一种是将光束的强度调整成为近高斯分布,另一种方法是补偿光束波前像差。对强度的补偿方法为增益导引效应,对波前像差的补偿方法有相位共轭镜、可变形镜等技术。利用球差校正板对球差进行补偿,也可以提高光束质量。

Based on the beam characteristics of supercontinuum laser,several beam quality evaluation methods for out-put beam quality of supercontinuum laser are analyzed,and the merit and demerit of every method are summarized.The most adaptive method of measuring the beam quality of supercontinuum laser was put forward by analyzing and comparing those evaluation methods.To improve the beam quality of supercontinuum laser,there are two methods.One is to adjust the intensity of the beam into a nearly Gaussian distribution,and the other is to compensate the wave-front aberration of the bam.The method of compensating the intensity is the gain guidance efect,and the compensa-tion methods of wavefront aberration include the phase conjugate mirror,the deformable mirror,and so on.The spheri-cal aberration can be compensated by the spherical aberration corrector,then the bam quality can also be improved.