Double-grating external cavity spectrum beam combining device

By designing an optical path compensation device in the dual grating external cavity spectral beam combining device, the relative settings of the reflection component and the right-angle reflection prism can be used to achieve optical path compensation and optical error compensation, which solves the problems of high energy loss and poor system stability of the dual grating spectral beam combining structure when adjusting the outer cavity length, and improves the beam combining efficiency and system stability.

CN119717292AActive Publication Date: 2025-03-28SICHUAN UNIV +1
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Patent Information

Application Number
CN202411802888.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-28
Estimated Expiration
2044-12-09

AI Technical Summary

Technical Problem

The dual grating spectral beam combined structure has problems such as high energy loss and poor system stability when adjusting the length of the outer cavity.

Method used

A dual grating external cavity spectral beam combining device is designed, and an optical path compensation device is adopted, including multiple optical path compensation components. Through the relative arrangement of the reflection component and the right-angle reflection prism, the reflection component is driven up and down with a transmission mechanism to realize optical path compensation, and optical errors are compensated by a column lens.

Benefits of technology

The beam-combining efficiency is improved, the light intensity loss is reduced, the system stability and accuracy are enhanced, and the wavefront uniformity and phase consistency of each sub-beam are ensured.

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Abstract

The invention relates to a double-grating external cavity spectrum beam combining device. The device comprises a semiconductor laser array light source, a fast axis collimating mirror, a slow axis collimating mirror, an optical path compensation device, a diffraction grating pair, a collimating lens and an output coupling mirror which are arranged in sequence. The optical path compensation device comprises a plurality of optical path compensation assemblies, and the optical path compensation assemblies are in one-to-one correspondence with sub light beams in the array light beams. An optical path compensation assembly is installed in an independent optical path transmission path of each sub-beam of the array beam, the outer cavity length and the beam combining efficiency of each sub-beam are changed through the optical path compensation assemblies, and specifically, the optical path of each sub-beam can be increased through the design that a reflection assembly installation platform drives a reflection assembly to move upwards, so that the beam combining efficiency is improved. Therefore, the length of the outer cavity is increased, the beam combining efficiency is improved, and the stability and precision of the system can be improved. And finally, the cylindrical lens can compensate optical errors introduced in a light beam transmission process, so that each sub-light beam is ensured to have good wavefront uniformity and phase consistency.
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