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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 27, Iss. 3 — Mar. 1, 2010
  • pp: 611–618

Measurement of solid-state optical refrigeration by two-band differential luminescence thermometry

W. M. Patterson, D. V. Seletskiy, M. Sheik-Bahae, R. I. Epstein, and M. P. Hehlen  »View Author Affiliations


JOSA B, Vol. 27, Issue 3, pp. 611-618 (2010)
http://dx.doi.org/10.1364/JOSAB.27.000611


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Abstract

We present a non-contact optical technique for the measurement of laser-induced temperature changes in solids. Two-band differential luminescence thermometry (TBDLT) achieves a sensitivity of 7   mK and enables a precise measurement of the net quantum efficiency of optical refrigerator materials. The TBDLT detects internal temperature changes by decoupling surface and bulk heating effects via time-resolved luminescence spectroscopy. Several Yb 3 + -doped fluorozirconate ( ZrF 4 BaF 2 LaF 3 AlF 3 NaF InF 3 , ZBLANI) glasses fabricated from precursors of varying purity and by different processes are analyzed in detail. A net quantum efficiency of ( 97.39 ± 0.01 ) % at 238 K (at a pump wavelength of 1020.5 nm) is found for a ZBLANI:1% Yb 3 + laser-cooling sample produced from metal fluoride precursors that were purified by chelate-assisted solvent extraction and dried in hydrofluoric gas. In comparison, a ZBLANI:1% Yb 3 + sample produced from commercial-grade metal fluoride precursors showed pronounced laser-induced heating that is indicative of a substantially higher impurity concentration. The TBDLT enables rapid and sensitive benchmarking of laser-cooling materials and provides critical feedback to the development and optimization of high-performance optical cryocooler materials.

© 2010 Optical Society of America

OCIS Codes
(160.5690) Materials : Rare-earth-doped materials
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6430) Spectroscopy : Spectroscopy, photothermal

ToC Category:
Spectroscopy

History
Original Manuscript: October 20, 2009
Revised Manuscript: December 14, 2009
Manuscript Accepted: January 5, 2010
Published: February 26, 2010

Citation
W. M. Patterson, D. V. Seletskiy, M. Sheik-Bahae, R. I. Epstein, and M. P. Hehlen, "Measurement of solid-state optical refrigeration by two-band differential luminescence thermometry," J. Opt. Soc. Am. B 27, 611-618 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-3-611

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