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Triggering of guiding and antiguiding effects in GaN-based VCSELs

Seyed Ehsan Hashemi (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Jörgen Bengtsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Johan S. Gustavsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Martin Stattin (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; M. Glauser ; G. Cosendey ; N.R. Grandjean ; M. Calciati ; M. Goano ; Åsa Haglund (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
Proceedings of SPIE - The International Society for Optical Engineering. Vertical-Cavity Surface-Emitting Lasers XVIII; San Francisco, CA; United States; 5 February 2014 through 6 February 2014 (1996-756X). Vol. 9001 (2014),
[Konferensbidrag, övrigt]

We show numerically that many recently proposed GaN-based VCSEL cavities, with DBR mirrors deposited onto the current aperture, balance dangerously close to the border between the guided and antiguided regime. A guided cavity is often preferred because of its lower optical loss, but a strongly antiguided cavity offers built-in modal discrimination favoring single fundamental mode operation. We show that very small changes in the VCSEL structure are sufficient to strongly change the guiding character of the VCSEL cavity, and that thermal lensing caused by device self-heating under operation can dramatically reduce the optical loss but not the modal discrimination in the antiguided cavities.

Nyckelord: antiguiding, thermal lensing effect , Gallium nitride vertical cavity surface emitting lasers , mode discrimination

Article Number: 90010A

Denna post skapades 2014-07-01. Senast ändrad 2015-12-07.
CPL Pubid: 199993


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