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High-brightness and high-efficiency diode laser module based on double wavelength division multiplexing external cavities

In this Letter, a new, to the best of our knowledge, external cavity structure based on double wavelength division multiplexing external cavities is proposed and demonstrated. The electro-optical conversion efficiency is improved and the brightness of the spectral beam combining diode lasers is enha...

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Bibliographic Details
Published in:Optics letters 2022-10, Vol.47 (19), p.5012-5015
Main Authors: Zhang, Weiqiao, Liu, Wenzhen, Wang, Juwen, Cao, Peng, Chen, Jingxuan, Ting, Fu, Zhou, Xuyan, Zheng, Wan-hua
Format: Article
Language:English
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Summary:In this Letter, a new, to the best of our knowledge, external cavity structure based on double wavelength division multiplexing external cavities is proposed and demonstrated. The electro-optical conversion efficiency is improved and the brightness of the spectral beam combining diode lasers is enhanced. One wavelength division multiplexing external cavity is placed on the rear-side of the laser emitters to provide the strong optical feedback for wavelength locking and the other wavelength division multiplexing external cavity is placed on the front-side of laser emitters to combine three emitter beams to one beam. A maximum output power of up to 7.5 W is obtained and the brightness of the laser diode is 100 MW cm −2 sr −1 with an electro-optical conversion efficiency of 46.5%. Compared with a standard cavity for spectral beam combining, the use of double wavelength division multiplexing external cavities results in an electro-optical conversion efficiency improvement of 6.5%. The whole structure provides a new technology to achieve high-brightness and high electro-optical conversion efficiency for a laser diode source.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.469352