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  • Vol. 23, Iss. 8 — Apr. 15, 1998
  • pp: 639–641

Laser cooling of a solid by 21K starting from room temperature

X. Luo, M. D. Eisaman, and T. R. Gosnell  »View Author Affiliations


Optics Letters, Vol. 23, Issue 8, pp. 639-641 (1998)
http://dx.doi.org/10.1364/OL.23.000639


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Abstract

A fluorozirconate glass doped with trivalent ytterbium ions has been laser cooled in vacuo from 298 to 277 K by optical pumping of the ions at 1015 nm. The cooling effect arises from anti-Stokes fluorescence of the laser-excited ions and by virtue of the near-unit fluorescence quantum efficiency for Yb3+ in sufficiently pure solid hosts. The sample temperatures in the experiment are determined by measurement of the Yb3+ emission spectrum; the value of the observed temperature change from room temperature as a function of pump wavelength is successfully explained in terms of a simple two-level model that includes the effect of optical saturation.

© 1998 Optical Society of America

OCIS Codes
(120.6780) Instrumentation, measurement, and metrology : Temperature
(140.3320) Lasers and laser optics : Laser cooling

Citation
X. Luo, M. D. Eisaman, and T. R. Gosnell, "Laser cooling of a solid by 21K starting from room temperature," Opt. Lett. 23, 639-641 (1998)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-23-8-639


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References

  1. R. I. Epstein, M. I. Buchwald, B. C. Edwards, T. R. Gosnell, and C. E. Mungan, Nature (London) 377, 500 (1995).
  2. C. Zander and K. H. Drexhage, in Advances in Photochemistry, D. C. Neckers, D. H. Volman, and G. von Bünau, eds. (Wiley, New York, 1995), p. 59.
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  6. C. E. Mungan, M. I. Buchwald, B. C. Edwards, R. I. Epstein, and T. R. Gosnell, Appl. Phys. Lett. 71, 1458 (1997).
  7. See Ref. for an example of the relaxation waveform measured with a 250-mm fiber.
  8. W. C. Hasz, J. H. Whang, and C. T. Moynihan, J. Non-Cryst. Solids 161, 127 (1993). Owing to the small amount of PbF2 (2–3%) in the ZBLANP composition, values of the mass density and specific heat for ZBLAN are used as approximations to the corresponding values for ZBLANP.
  9. A value of 1.0 for the effective emissivity was assumed in Ref. 5.

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