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Athermalization of the Lasing Wavelength in Vertical-Cavity Surface-Emitting Lasers

L. Persson1, F. Hjort1, G. Cardinali2, J. Enslin2, T. Kolbe3, T. Wernicke2, M. Kneissl2,3, J. Ciers1, and Å. Haglund1

Published in:

Laser Photonics Rev., vol. 17, no. 8, pp. 2300009, doi:10.1002/lpor.202300009 (2023).


A concept for vertical-cavity surface-emitting lasers (VCSELs) is proposed and demonstrated to obtain a lasing wavelength with unprecedented temperature stability. The concept is based on incorporating a dielectric material with a negative thermo-optic coefficient, dn/dT, in the distributed Bragg reflectors (DBRs) to compensate the positive dn/dT of the semiconductor cavity. In a short cavity, the optical field has a significant overlap with the DBRs, and the redshift of the lasing wavelength caused by the semiconductor cavity can be compensated by the negative dn/dT of the DBRs. Here, proof of this concept is presented for optically-pumped VCSELs emitting at 310 nm, demonstrating a lasing wavelength that even blueshifts by less than 0.1 nm over an 80 °C range with a maximum slope of –3.4 pm K−1. This is to be compared with a redshift of 1–1.5 nm over the same temperature range reported for III-nitride blue-emitting VCSELs. Furthermore, this method can also be implemented in VCSELs with longer cavity lengths by including a dielectric layer between the semiconductor and the DBR. The approach used here to obtain a temperature-stable lasing wavelength is generic and can therefore be applied to VCSELs in all material systems and lasing wavelengths.

1 Department of Microtechnology and Nanoscience Chalmers University of Technology, Gothenburg 41296, Sweden
2 Institute of Solid State Physics Technische Universität Berlin, 10623 Berlin, Germany
3 Ferdinand-Braun-Institut, 12489 Berlin, Germany


AlGaN, dielectric DBR, electrochemical etching, ultraviolet, UVB, vertical-cavity surface-emitting lasers, wavelength stability

© 2023 The Authors. Laser & Photonics Reviews published by Wiley-VCH GmbH.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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