Effects of cryogenic temperatures on the performance of CW VECSELs
Effects of cryogenic temperatures on the performance of CW VECSELs
复制标题
低温对 CW VECSEL 性能的影响
DOI:
10.1117/12.2002368
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Morris O
中科院分区:
文献类型:
--
作者:
Morris O
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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