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Abstract

A broadband continuously tunable semiconductor disk laser is reported in this paper. The active region of gain chip is composed of InGaAs multiple quantum wells with resonant periodic gain structure, and its fluorescence peak wavelength is around 965 nm. Using the wideband characteristics of the quantum wells in gain chip, along with the simple linear cavity that is formed by a high reflectivity external mirror, the laser has a low cavity loss and a wide tuning range. The continuously tunable laser wavelength can be obtained by inserting birefringent filters with different thickness into the cavity. When the thickness of the birefringent filter is 2 mm, the wavelength tuning range of the laser is 45 nm, the maximum output power is 122 mW, and the beam quality M ²factors in the X-and the Y-directions are 1.00 and 1.02, respectively. The temperature characteristics of the surface-emitting spectra of gain chip and the narrowing effect of birefringent filter on laser linewidth h are also discussed.

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Authors and contacts

Corresponding author:Wang Tao,wangt@cqnu.edu.cn; Zhang Peng,zhangpeng2010@cqnu.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 61904024), the Science and Technology Research Program of Chongqing Municipal Education Commission, China (Grant No. KJZD-M201900502), the Chongqing Research Program of Basic Research and Frontier Technology, China (Grant No. cstc2018jcyjAX0319), the “Blue Fire Plan” (Huizhou) Foundation of Industry University Research Joint Innovation of Ministry of Education, China (Grant No. CXZJHZ201728), the State Key Laboratory of Luminescence and Applications, China (Grant No. SKLA-2019-04), and the Scientific and Technological Research Program of Chongqing Municipal Education Commission, China (Grant No. KJQN201800528).

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Vol. 70, Issue 22 - 2021-11-20

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