Introduction

The helium-neon laser used in this experiment has a novel structure, can be used for open display, and has the characteristics of moderate power and good mode. The experimental content is closely integrated with the teaching knowledge, which is particularly suitable for basic experimental teaching of laser principle courses. This helium-neon laser experiment is uniquely equipped with a digital spot profiler in China, which can simultaneously observe the distribution of longitudinal and transverse modes. This laser can continuously change parameters such as cavity shape and mode. The excellent laser cavity mirror adjustment mount greatly reduces the difficulty of adjusting the helium-neon laser and effectively establishes stable and highly repeatable experimental conditions for teaching related principles.

Experiments

Virtual simulation and adjustment experiments of helium-neon laser resonator;

Confocal spherical scanning interferometer adjustment experiment;

Helium-neon semi-external cavity equivalent cavity length measurement experiment;

Laser transverse mode conversion and parameter measurement experiments;

Helium-Neon laser longitudinal mode orthogonal polarization and mode competition observation experiment;

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 beam waist radius and divergence angle);

Beam quality analysis;

Laser cavity design experiments.

Experimental Knowledge

Basic components of laser, laser working material, pump source, optical resonant cavity, laser power, laser transverse mode, laser longitudinal mode, polarization state, orthogonal polarization, Gaussian beam parameters (diameter, beam waist, divergence angle), Gaussian beam transformation, confocal spherical scanning interferometer, free spectral region.

Typical Testing

Laser Beam Quality Analysis Software                       Longitudinal Measurement

Piezoceramic Controller                                             Power Meter