Demonstration of diode-pumped optical refrigeration to cryogenic temperature

Alexander R. Albrecht; Jackson L. Kock; Seth D. Melgaard; Richard I. Epstein; Mansoor Sheik-Bahae

doi:10.1117/12.2652259

17 March 2023 Demonstration of diode-pumped optical refrigeration to cryogenic temperature

Alexander R. Albrecht, Jackson L. Kock, Seth D. Melgaard, Richard I. Epstein, Mansoor Sheik-Bahae

Proceedings Volume PC12437, Photonic Heat Engines: Science and Applications V; PC1243708 (2023) https://doi.org/10.1117/12.2652259
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

We cooled a 10% Yb:YLF crystal to temperatures of approximately 130 K using a fiber-coupled laser diode module emitting at 1020 nm. Previous approaches to optical refrigeration typically relied on high-power fiber lasers and intricate multi-pass schemes to reach cryogenic temperatures. In the current experiments a combination of dielectric mirrors deposited onto the sample and total internal reflection confined the laser light inside the crystal. The divergent beams of laser diodes produce relatively low average intensity inside the crystal, mitigating nonlinearities like absorption saturation and lasing. We have designed a full diode-pumped cryo-cooler with a coldfinger to cool arbitrary loads.

Conference Presentation

Citation Download Citation

Alexander R. Albrecht, Jackson L. Kock, Seth D. Melgaard, Richard I. Epstein, and Mansoor Sheik-Bahae "Demonstration of diode-pumped optical refrigeration to cryogenic temperature", Proc. SPIE PC12437, Photonic Heat Engines: Science and Applications V, PC1243708 (17 March 2023); https://doi.org/10.1117/12.2652259

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