Anti-Stokes laser refrigeration of a nanoscale semiconductor gain medium

Anupum Pant; Xiaojing Xia; E. James Davis; Peter J. Pauzauskie

doi:10.1117/12.2507991

1 March 2019 Anti-Stokes laser refrigeration of a nanoscale semiconductor gain medium

Anupum Pant, Xiaojing Xia, E. James Davis, Peter J. Pauzauskie

Proceedings Volume 10936, Photonic Heat Engines: Science and Applications; 1093606 (2019) https://doi.org/10.1117/12.2507991
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Laser radiation has conventionally been used to cool the mechanical amplitude of oscillators with approaches based on electronic feedback and cavity-induced radiation pressure. However, the direct laser refrigeration of an optomechanical oscillator has remained a challenge. Optically refrigerating the lattice of an optical resonator promises to impact several fields including the development of radiation balanced lasers. In this work, we demonstrate laser refrigeration of a hydrothermally synthesized 10 % ytterbium (Yb³⁺) doped lithium yttrium fluoride (YLF) crystal placed at the free end of a cadmium sulfide nanoribbon (CdSNR). An incident 1020 nm laser is used to cool the crystal and the back-scattered up-converted Yb³⁺ emission is analyzed using two-band differential luminescence thermometry (DLT) to monitor the temperature of the YLF crystal. A temperature drop of 23.6 K below room temperature is recorded at a focused laser power of 40.1 mW. Lastly, a combination of finite element wave optics and heat transfer calculations were used to estimate the imaginary part of the refractive index of the YLF crystal.

Citation Download Citation

Anupum Pant, Xiaojing Xia, E. James Davis, and Peter J. Pauzauskie "Anti-Stokes laser refrigeration of a nanoscale semiconductor gain medium", Proc. SPIE 10936, Photonic Heat Engines: Science and Applications, 1093606 (1 March 2019); https://doi.org/10.1117/12.2507991

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