Laser beam expander for optical experiment

Abstract

The invention discloses a laser beam expander for an optical experiment. The laser beam expandere comprises a main lens barrel and an auxiliary lens barrel, wherein a lower lens seat is mounted at thelower end of the main lens barrel; a lower lens is fixedly arranged in the lower lens seat; an upper lens seat is mounted at the upper end of the main lens barrel; an upper lens is fixedly arranged in the upper lens seat; the auxiliary lens barrel is mounted above the upper lens seat; an auxiliary lens is fixedly arranged in the auxiliary lens barrel; the inner wall of the main lens barrel is divided into an upper part and a lower part, and comprises an upper cavity and a lower cavity; the inner diameter of the upper cavity is less than that of the lower cavity; the upper cavity and the lowercavity is smoothly transitioned through an arc-shaped protrusion; the upper end of the inner wall of an upper barrel column is of an outwards protruding arc-shaped structure, so that laser beams withdifferent wavelengths can be expanded; during beam expansion, an emitting angle and position of laser can be adjusted; by the adoption of the beam expander principle of firstly changing the quality of a laser spot and then adjusting a divergence angle and enlarging the diameter of a laser beam, the quality of laser is corrected, and the divergence angle is adjusted; the optical experiment laser beam expander is simple in structure and high in generality, and can effectively improve the flexibility and reliability of the optical experiment.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to an optical experiment laser beam expander. Background technique [0002] Optical experimental instruments mainly include laser light sources, optical components, observation screens or information recording media, etc. The laser light sources are generally oscillators, which use stimulated radiation to realize light oscillation or generate coherent light, such as gas type He-Ne cavity type Lasers; the optical components generally include anti-vibration beam splitters, beam expanders, collimating mirrors, reflectors, imaging lenses, etc. Among them, the beam expander is an important component in the optical experiment. Because the divergence angle of the laser beam is very small, a beam expander is needed to increase the divergence angle of the beam. [0003] In the basic principle experiment of holography, in order to obtain the real image of the object, all the information of the...

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Problems solved by technology

[0005] In order to solve the defects of poor flexibility and poor beam expansion stability of the existing beam expander, the present invention provides an optical experiment laser beam expander, which can adjust the exit angle and position of the laser while expanding the beam, and adjust the main lens barrel The inner wall is specially designed to reduce the influence of the inner wall of the main lens barrel on the beam diffusion process, improve the stability of the beam expansion, and obtain a laser beam with good spot quality and good collimation

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