激光光束传输特性分析─—等效波面曲率半径法

Laser beam analysis──the beam effective radius approach

本文提出了利用光束等效波面曲率半径，并结合束宽及远场发散角来测量分析激光光束传输特性的方法，能以较高的精度确定激光光束的束腰位置ｚｏ，束腰处的束宽Ｄ＿ｏ及激光光束质量传输因子Ｍ￣２。这是一种可用于连续，重复频率脉冲及单脉冲激光光束传输特性的分析测量方法。文中还给出了实现这一方法的具体测量方案。

A laser beam analysis method is proposed by using the beam effective ra-dius R(z)with the measurements of beam width d(z)and beam divergence angle θ。The location of the beam z_o and the times-diffraction-limit-factor M￣2 can be determined with relative high accuracy. The method is usable for CW Iaser beam,repetition pulsed laser beam and single pulsed laser beam.Two practical apparatus designs are also pro-posed.