A kind of beam expanding collimating optical system and its preparation method

Abstract

The invention discloses a beam expanding collimating optical system and a preparation method thereof. The optical system includes a front group transmission beam expansion collimation group and a rear group reflection beam expansion collimation group; according to the incident direction of the light, the transmission beam expansion collimation group includes a double concave negative mirror, a double convex positive mirror and two Positive meniscus mirror; the curvatures of the two positive meniscus mirrors are bent toward the direction of light incidence; the reflection beam expanding collimation group includes two parabolic mirrors with the same focus position, which are small-diameter parabolic mirrors and large-diameter parabolic mirrors in turn, and large-diameter parabolic mirrors. The shape of the parabolic mirror is off-axis concave. The beam expansion collimation system provided by the present invention can provide collimation beam expansion for any laser wavelength or white light laser in a wide band range, and does not need any moving compensation components. It has compact structure, small size, large beam expansion magnification and high collimation performance, and can be used in holographic imaging, optical testing, lidar and other fields.

Description

technical field [0001] The invention relates to a compact wide-band high-magnification beam expansion collimation optical system and a preparation method thereof. Background technique [0002] In many applications such as optical detection, spectral calibration, lidar, security, etc., it is necessary to shape the beam to emit the beam at a very small angle, so as to achieve long-distance transmission or optimal coupling of the beam. At present, the beam expansion and collimation of the optical system can be divided into two types, one is for the application and development of a single band of laser beam, and the corresponding beam expansion and collimation system has a transmission type, a reflection type and a combination of the two; the other is One is for the application of lasers at multiple wavelengths. This structure changes the distance between the eyepiece and the objective lens to adapt to different wavelengths while keeping the parameters of the optical components ...

AI Technical Summary

Problems solved by technology

When adjusting the distance between the objective lens and the eyepiece, the system's spacing accuracy, parallelism and coaxiality will bring errors and affect the collimation performance

And with the application of continuous or white light lasers and some special applications, it is necessary to expand and collimate optical systems suitable for continuous wavelength laser beams in a wide range of wavelengths. This method of changing the spacing cannot meet the requirements.

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