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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.
|Title of host publication||Vertical External Cavity Surface Emitting Lasers (VECSELs) III|
|Publication status||Published - 15 Apr 2013|
|Event||Vertical External Cavity Surface Emitting Lasers (VECSELs) III - San Francisco, CA, United States|
Duration: 3 Feb 2013 → 5 Feb 2013
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Conference||Vertical External Cavity Surface Emitting Lasers (VECSELs) III|
|City||San Francisco, CA|
|Period||3/02/13 → 5/02/13|
- optically pumped
- semiconductor disk laser
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1/10/13 → 28/02/18