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Anti-Stokes laser refrigeration of a nanoscale semiconductor gain medium
Author(s): Anupum Pant; Xiaojing Xia; E. James Davis; Peter J. Pauzauskie
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Paper 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.

Paper Details

Date Published: 1 March 2019
PDF: 7 pages
Proc. SPIE 10936, Photonic Heat Engines: Science and Applications, 1093606 (1 March 2019); doi: 10.1117/12.2507991
Show Author Affiliations
Anupum Pant, Univ. of Washington (United States)
Xiaojing Xia, Univ. of Washington (United States)
E. James Davis, Univ. of Washington (United States)
Peter J. Pauzauskie, Univ. of Washington (United States)
Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 10936:
Photonic Heat Engines: Science and Applications
Denis V. Seletskiy; Richard I. Epstein; Mansoor Sheik-Bahae, Editor(s)

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