Open AccessUltra-narrow linewidth characteristics of 795-nm subwavelength grating-coupled cavity vertical cavity surface emitting laser
Author(s) -
F. Zhang,
Lan Fu,
Peipei Hu,
Wei Han,
H. L. Wang,
Han Zhang,
Baolu Guan
Publication year - 2021
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.70.20210293
Subject(s) - laser linewidth , vertical cavity surface emitting laser , materials science , optics , laser , grating , optoelectronics , resonance (particle physics) , coupling (piping) , tunable laser , wavelength , physics , metallurgy , particle physics
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.