Abstract
With the development of laser the application of laser technology has been in various fields include the military, science and technology, and social development. The various parameters of laser are the evaluation criteria of good performance of laser. How to measure the laser parameters more accurately is currently a hot spot in laser field study.
The issue talks about the classification and characteristics of the laser,and the fields of its application。Classify the laser beam ,according to the space symmetry and coherence. Study the transmission and transformation properties of Gaussian beam,and the characteristic parameters of it. Emphasis on analyzing the beam quality evaluation and measurement。Measure the light intensity distribution of three lasers。Use CCD to measure the laser spots. Establish the system of laser judgment and parameter measurement. Explain the measure principle of the laser beam. Analyze the beam parameters physical description of beam parameters on theory. Compare all kinds of common evaluation schemes. Introduce some traditional laser beam quality evaluation methods,and find out their deficiencies. Study the scientific and rationality by using the beam diffraction limit rate as the standard of beam quality evaluation. Also deduce the calculation formula of the beam parameters. Introduce the experimental apparatus and experimental procedure in the end. Finally use the three-point method to measure the various parameters of laser beam,and analyze why the system errors causes.
Keywords: laser classification laser application laser parameter measurement Gaussian beam CCD method