Introduction

With the deepening of laser research, beam quality, as an important technical indicator for evaluating laser beam performance, has become the focus of research. The laser beam quality and transmission conversion experiment launched this time measures the spot width and light intensity distribution according to the international standard for laser beam testing (ISO), and introduces the calculation of the laser beam waist position and width, emission angle, and m² factor. And the principle of Gaussian beam transformation through thin lens was explained. The experimental content closely follows the relevant knowledge of the course "Laser Principles and Applications", combines theoretical calculations with practical measurements, and cultivates students' hands-on ability. It is an ideal equipment for experimental teaching in optoelectronics majors.

Experiments

Measurement of basic parameters of Gaussian beam (spot center and axis length calculation, spot size changes with position, M2 factor, light waist position, light waist radius, Rayleigh length and far-field divergence angle);

Propagation characteristics of Gaussian beam (effect of lens on beam quality parameters, q parameter calculation, beam propagation transformation formula);

Beam expansion, collimation and focusing of Gaussian beam (the influence of the beam expander lens group on the beam quality parameters, the change formula of the light waist radius and divergence angle);

Beam quality analysis (fully automatic beam quality analysis).

Experimental Knowledge

Gaussian beam, cross-sectional light intensity, beam radius, equal phase surface, Rayleigh length, far-field divergence angle, q parameter, beam transformation, beam expansion collimation, beam quality factor.

Typical Testing

  Laser Beam Quality Analysis Software                          Helium-Neon Laser

Electric Displacement Stage                                             Camera