Effects of cryogenic temperatures on the performance of CW VECSELs

Oliver J. Morris, Keith G. Wilcox, C. R. Head, Andrew P. Turnbull, Ian Farrer, Harvey E. Beere, David A. Ritchie, Anne C. Tropper

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report the effects of cryogenic temperatures on the performance of two CW VECSELs. Firstly we make use of a liquid nitrogen cooled copper cold finger cryostat to house an entire VECSEL device within the vacuum space and report a 3.3 fold reduction in lasing threshold and a 3.6 times increase in the slope efficiency when the gain chip is held at 133 K compared to 293 K. Secondly we show that a VECSEL utilising an unprocessed gain chip and pumped with constant pump-spot size, exhibits thermal rollover at twice the incident pump power when held at 20 K and compared to operation at 293 K. This enhanced performance will motivate the development of processed gain chips that are robust against thermal contraction.

Original languageEnglish
Title of host publicationVertical External Cavity Surface Emitting Lasers (VECSELs) III
DOIs
Publication statusPublished - 15 Apr 2013
EventVertical External Cavity Surface Emitting Lasers (VECSELs) III - San Francisco, CA, United States
Duration: 3 Feb 20135 Feb 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8606
ISSN (Print)0277-786X

Conference

ConferenceVertical External Cavity Surface Emitting Lasers (VECSELs) III
Country/TerritoryUnited States
CitySan Francisco, CA
Period3/02/135/02/13

Keywords

  • Cryogenic
  • OPSL
  • optically pumped
  • semiconductor disk laser
  • VECSEL

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