19 February 2014 Intracavity optical refrigeration to 131K using high-power vertical external-cavity surface-emitting lasers (VECSELs)
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Proceedings Volume 9000, Laser Refrigeration of Solids VII; 900005 (2014) https://doi.org/10.1117/12.2040116
Event: SPIE OPTO, 2014, San Francisco, California, United States
Abstract
Laser cooling of Yb:YLF crystal to 131 K from room temperature has been demonstrated in an active intracavity arrangement for enhanced pump absorption. The laser is a high-power, broadly-tunable InGaAs/GaAs MQW VECSEL capable of producing 20 Watts at 1020 nm, directly at the E4-E5 transition of the Yb-ion. This is the coldest temperature achieved to date in an intracavity geometry and without sophisticated heat load management of the crystal. This progress presents a significant advancement towards an all-solid-state compact cryocooler.
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Mohammadreza Ghasemkhani, Alexander R. Albrecht, Seth D. Melgaard, Denis V. Seletskiy, Jeffrey G. Cedeberg, Mansoor Sheik-Bahae, "Intracavity optical refrigeration to 131K using high-power vertical external-cavity surface-emitting lasers (VECSELs)", Proc. SPIE 9000, Laser Refrigeration of Solids VII, 900005 (19 February 2014); doi: 10.1117/12.2040116; https://doi.org/10.1117/12.2040116
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