This article is cited in 2 papers

Lasers, active media

Low-threshold, single-transverse-mode, 940-nm vertical-cavity surface-emitting laser with a mode filter and half-wavelength cavity

Q. H. Ren^a, J. Wang^a, M. Yang^a, H. J. Wang^a, Z. Cheng^a, Y. Q. Huang^a, X. M. Ren^a, H. M. Ji^b, S. Luo<sup>b

a</sup> State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, China
^b Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, China

Abstract: We demonstrate a structure for a vertical-cavity surfaceemitting laser (VCSEL) with a mode filter and half-wavelength (λ/2) cavity. The effects of λ/2- and λ-cavities on the threshold current are studied. The thickness and etched diameter of the mode filter are optimised to achieve single-transverse-mode output. The results show that when changing from λ-cavity to λ/2-cavity, the threshold current of the VCSEL decreases by 30.8% (from 0.85 mA to 0.65 mA). In addition, for the mode-filter thickness of 80 nm, and the etched diameter of 2.5 μm, the side mode suppression ratio reaches 90 dB, which meets the requirement of single-transversemode output. The VCSELs with the optimised design can overcome many difficulties and have great potential in 3D face recognition.

Keywords: VCSELs, mode filter, single-transverse-mode, halfwavelength cavity, threshold current.

Received: 25.02.2020
Revised: 13.05.2020

 English version: Quantum Electronics, 2020, 50:8, 714–719

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