Research on measurement of laser beam M-2 factor based on LabVIEW

摘要

A new method for measuring the laser beam M-2 factor is presented in this paper. Fixed magnification attenuation and focusing optical system is used to irradiate the laser beam to the CCD camera for spot acquisition, the collected spot is detected and processed based on the LabVIEW software platform, then the Zernike polynomial is used to fit and reconstruct the wavefront of the laser spot, the spatial distribution of the laser beam is given in real time, the optical parameters such as M-2 factor are obtained. A test device is also set up for verification. The working wavelength is 400 similar to 1100nm, and the measurement accuracy of the M-2 factor is +/- 6 %, it can meet most of the current requirements.