A laser based on nonlinear optical frequency conversion

By combining diamond Raman conversion and traditional nonlinear frequency doubling technology, the problem of balancing material bandgap, frequency doubling effect and birefringence in multi-wavelength lasers has been solved, realizing high-power multi-wavelength light output and improving the performance and application potential of lasers.

CN117013352BActive Publication Date: 2026-07-14HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEBEI UNIV OF TECH
Filing Date
2023-08-25
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing multi-wavelength laser solutions suffer from complex manufacturing processes, high costs, and insufficient output power. It is difficult to achieve a balance between material bandgap, frequency doubling effect, and birefringence in the same crystal structure, which makes multi-wavelength laser output difficult.

Method used

By combining diamond Raman conversion with traditional nonlinear frequency doubling, and through the combination of a pump source, a fourth-harmonic light generation unit, a seed light generation unit, a reflection beam splitting unit, and a sum-frequency light generation unit, high-power, high-conversion-efficiency five-wavelength light output was achieved.

Benefits of technology

It achieves high-power, high-conversion-efficiency multi-wavelength light output at 1512nm, 520nm, 260nm, 222nm and 193nm, overcoming the difficulty of directly generating deep ultraviolet lasers with wavelengths less than 200nm by frequency doubling, and improving the performance and application range of the laser.

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Abstract

This invention relates to a laser based on nonlinear optical frequency conversion, belonging to the field of lasers. The invention addresses the problem that existing lasers, limited by the development of nonlinear crystal materials, struggle to balance the material bandgap, frequency doubling effect, and birefringence within the same crystal structure, thus hindering the realization of multi-wavelength laser output. The invention's solution involves a pump source emitting two pump beams with wavelengths λ1 and λ2. The pump beam with wavelength λ1 passes through a fourth-harmonic generation unit to output fourth-harmonic light; the pump beam with wavelength λ2 passes through a seed light generation unit to output light with wavelength λ... S The Stokes light, after passing through a portion of the Stokes light beam and the fourth harmonic light in the first reflection beam splitting unit, is incident together into the first sum frequency light generating unit and outputs the first sum frequency light. The remaining Stokes light beam after passing through the first reflection beam splitting unit is incident into the second reflection beam splitting unit. The Stokes light after passing through the second reflection beam splitting unit and the first sum frequency light are incident together into the second sum frequency light generating unit, and the output second sum frequency light is used as the output beam of the laser.
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