Research on High Power Laser beam and focus Transverse Intensity Distribution Measuring Instrument

摘要

Using the method of rotating hollow probe, the measuring system which can directly measure laser transverse intensity distribution of high power laser beams/focus for laser processing is studied. The mathematical and physical models of measured laser beams/focus propagation in hollow probe are founded. According to the calculation, the system parameters, including pinhole diameter of hollow probe, dimension of propagation channel, dot number of sampling, are discussed. A new measuring system is designed. The measuring of high power laser beams/focus by this system is realized. The calculation results are satisfied with the measuring results. The instrument can measure CO_2 and YAG laser, measured power larger than 10kW, maximal measured power density up to 10~7w/cm~2, maximal diameter 60mm, laser focus minimal diameter smaller than 0.5mm.