High power broadband tunable long-wave mid-infrared femtosecond laser generation device and method

By using a 1.5μm high-power femtosecond laser pump source and BGGSe crystal optical parametric amplification, combined with phase matching angle adjustment, a long-wavelength mid-infrared femtosecond laser output with a wide tuning range and high power was achieved, solving the problems of narrow long-wavelength tuning range and low power in the existing technology, and significantly improving conversion efficiency and stability.

CN122136696BActive Publication Date: 2026-07-07CHENGDU DEANTKO OPTOELECTRONICS TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610615080.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-07
Publication Date
2026-07-07
Estimated Expiration
2046-05-07

AI Technical Summary

Technical Problem

Existing mid-infrared femtosecond laser devices based on BGGSe crystals suffer from problems such as narrow long-wavelength tuning range, low power, and the need to balance compact structure, making it difficult to achieve wide tuning range, high power, and stable output.

Method used

A 1.5μm high-power femtosecond laser is used as the pump source, combined with a BGGSe crystal for optical parametric amplification. Through two-stage cascaded optical parametric amplification and spatial beam combining, combined with phase matching angle adjustment, high-power, broadband tunable long-wavelength mid-infrared femtosecond laser output is achieved.

Benefits of technology

A wide tuning range, high power, and long-term stable output were achieved in the 10–16 μm range, significantly improving conversion efficiency and output stability, and solving the problems of low average power and narrow tuning range of long-wavelength mid-infrared femtosecond lasers in the prior art.

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Abstract

This invention discloses a high-power, broadband, tunable long-wavelength mid-infrared femtosecond laser generation device and method. The laser beam is split into a first beam and a second beam. The first beam pumps a first YAG crystal to generate a first supercontinuum, from which a signal light of a predetermined wavelength is selected. The signal light undergoes at least two cascaded optical parametric amplification stages to generate a high-power mid-infrared pump light. The second beam pumps a second YAG crystal to generate a second supercontinuum covering the long-wavelength infrared band as a seed light. This seed light is then incident on a BGGSe crystal for optical parametric amplification. Using a 1.5μm high-power femtosecond laser as the pump source, combined with the BGGSe nonlinear crystal for optical parametric amplification, the wide transmission range and high nonlinear coefficient of the BGGSe crystal are effectively utilized. Phase matching in the 6–18μm band can be achieved under 1.5μm pumping conditions, thereby obtaining a broadband, high-power, femtosecond-level laser output covering the long-wavelength mid-infrared band.
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