Effects of cryogenic temperatures on the performance of CW VECSELs

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

doi:10.1117/12.2002368

18 February 2013 Effects of cryogenic temperatures on the performance of CW VECSELs

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

Author Affiliations +

Proceedings Volume 8606, Vertical External Cavity Surface Emitting Lasers (VECSELs) III; 86060L (2013) https://doi.org/10.1117/12.2002368
Event: SPIE LASE, 2013, San Francisco, California, United States

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.

Citation Download Citation

Oliver J. Morris, Keith G. Wilcox, C. Robin Head, Andrew P. Turnbull, Ian Farrer, Harvey E. Beere, David A. Ritchie, and Anne C. Tropper "Effects of cryogenic temperatures on the performance of CW VECSELs", Proc. SPIE 8606, Vertical External Cavity Surface Emitting Lasers (VECSELs) III, 86060L (18 February 2013); https://doi.org/10.1117/12.2002368

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