18 February 2013 Effects of cryogenic temperatures on the performance of CW VECSELs
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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.
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Oliver J. Morris, Oliver J. Morris, Keith G. Wilcox, Keith G. Wilcox, C. Robin Head, C. Robin Head, Andrew P. Turnbull, Andrew P. Turnbull, Ian Farrer, Ian Farrer, Harvey E. Beere, Harvey E. Beere, David A. Ritchie, David A. Ritchie, Anne C. Tropper, 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); doi: 10.1117/12.2002368; https://doi.org/10.1117/12.2002368
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