飞秒激光脉冲波前相位的干涉重建

Wavefront Phase Reconstruction for Femtosecond Laser Pulse by Interferometry

提出了一种重建飞秒激光脉冲波前相位的方法。该方法不需要波前传感器，它由一个简单的马赫一曾德尔干涉光路采集干涉条纹，利用自适应镜对物光光路上的飞秒激光波前进行相位控制，通过由干涉条纹分析法，菲涅耳衍射法与相位解包络算法组成的一套空间相位重建算法，得到扰动的相位信息。利用微机械薄膜变形镜镜面形变与电压具有平方关系以及自适应镜的形变具有叠加性这两个性质，通过实验验证了该空间相位重建方法的正确性，这为飞秒激光脉冲波前相位的重建与记录提供了有效的解决途径。

A method to reconstruct the wavefront phase of the femtosecond laser pulse is proposed. Without a wavefront sensor in this method, a simple Mach-Zehnder interferometer is used to form interference fringes and a deformable mirror is used for spatial shaping of the femtosecond laser pulse on the object beam path. With the algorithms of interference fringe analysis, Fresnel diffraction and phase unwrapping, the disturbed phase information is obtained. Furthermore, with the square relationship between the deformation of micromachined membrane deformable mirror （MMDM） surface and single actuator voltages and iterative properties of the deformation, this method is verified, which shows an effective way for wavefront phase reconstruction and record of femtosecond laser pulse.