Author(s): Qiu, PP (Qiu, Pingping); Wu, B (Wu, Bo); Fu, P (Fu, Pan); Li, M (Li, Ming); Yan, WN (Yan, Weinian); Jia, RW (Jia, Ruiwen); Xie, YY (Xie, Yiyang); Kan, Q (Kan, Qiang)

Source: OPTICS COMMUNICATIONS Volume: 504 Article Number: 127450 DOI: 10.1016/j.optcom.2021.127450 Published: FEB 1 2022

Abstract: A novel method to realize single-transverse-mode emission by incorporating a built-in index guide is employed on vertical-cavity surface-emitting lasers (VCSELs) with a large oxide aperture. The etched index guide provides modal loss discrimination for mode selection and transverse optical field confinement for light propagating in the longitudinal direction. A single-transverse-mode VCSEL with side-mode suppression ratio >30 dB under the full range of bias currents is achieved. The thermal resistance of the device is lower than one half of the counterpart of the conventional GaAs-based single-mode VCSELs. Moreover, compared with an ordinary VCSEL with the same oxide aperture diameter, the beam quality of the device incorporated a built-in index guide has been significantly improved. The divergence angle of the output beam estimated from the full-width-half-maximum of the far-field pattern is as small as 9 degrees.

Accession Number: WOS:000709772100019

ISSN: 0030-4018

eISSN: 1873-0310

Full Text: https://www.sciencedirect.com/science/article/pii/S0030401821006994?via%3Dihub