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Abstract

In this paper, the 795-nm vertical cavity surface emitting laser (VCSEL) with sub-wavelength grating coupled cavity is proposed and designed based on the theory of resonant coupled cavity, and the mechanism of multi-cavity coupling linewidth narrowing and influencing factors are analyzed in detail by using the COMSOL software finite element method. The analysis results show that when photonic resonance takes place in a multi-coupled cavity, the grating-coupled cavity with reasonable design parameters and the multi-coupled cavity formed by precisely controlled lasers are phase-matched, which greatly strengthens the narrowing effect of the spectral linewidth resonance, and a 795-nm VCSEL laser with high beam quality and ultra-narrow linewidth output is obtained, finally. Theoretical results display that the reflection spectrum cold cavity linewidth Δλc of the coupling cavity with a thickness of 180nm of the spacer layer can reach 7 pm, which lays a theoretical foundation for achieving a kHz-level spectral linewidth output of VCSEL lasers.

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Authors and contacts

Corresponding author:Guan Bao-Lu,gbl@bjut.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 60908012, 61575008, 61775007), the Natural Science Foundation of Beijing City, China (Grant No. 4172011) and the Beijing Municipal Commission of Education of China (Grant No. 040000546319525).

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

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