Super-symmetric loss type semiconductor laser and preparation method thereof

By introducing a supersymmetric loss-type structure into a conical laser and utilizing left and right supersymmetric waveguides to directionally disperse higher-order transverse modes, the problem of beam quality degradation in conical lasers under high-power output was solved, achieving high stability and single-mode output.

CN122225280APending Publication Date: 2026-06-16BEIJING UNIV OF TECH
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Patent Information

Application Number
CN202610375920.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-25
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Conical lasers are prone to exciting higher-order transverse modes under high-power output, which leads to a deterioration in beam quality. Existing leaky groove structures are complex to manufacture and may cause light leakage, reducing stability.

Method used

The structure of a supersymmetric loss semiconductor laser is adopted, including a ridge waveguide and a tapered gain waveguide. Combined with left and right supersymmetric waveguides, higher-order transverse modes are directionally dispersed through a refractive index coupling mechanism to achieve single-mode output of the fundamental transverse mode.

Benefits of technology

It improves the beam quality and stability of the laser, reduces the lasing threshold of higher-order transverse modes, realizes single transverse mode output, and simplifies the manufacturing process.

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Abstract

The invention discloses a super-symmetric loss type semiconductor laser and a preparation method thereof. The super-symmetric loss type semiconductor laser comprises a ridge waveguide and a conical gain waveguide which are integrated on the same epitaxial structure, the conical gain waveguide is located at the output end of the ridge waveguide; a left super-symmetric waveguide and a right super-symmetric waveguide are arranged in the conical gain waveguide, and the left super-symmetric waveguide and the right super-symmetric waveguide are asymmetrically arranged on the two sides of the central axis of the conical gain waveguide, so that the conical gain waveguide is divided into three parts; the starting width of a central amplification region between the left super-symmetric waveguide and the right super-symmetric waveguide is the same as the width of the ridge waveguide; the left super-symmetric waveguide and the right super-symmetric waveguide have unequal transverse widths, propagation constants of base transverse modes or high-order modes generated by the left super-symmetric waveguide and the right super-symmetric waveguide are matched with propagation constants of high-order transverse modes generated in the ridge waveguide, and the high-order transverse modes in the loss transmission process are directionally dissipated through a refractive index coupling mechanism. Therefore, fundamental transverse-mode single-mode laser output is realized.
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