Funded by   Air Force Office of Scientific Research (2004-2009)                                                PI: Mansoor Sheik-Bahae




















 Laser Refrigeration of Solids III  (Jan. 23-28, 2010, San Francisco)



July 13 2009

































 UNM Today

Physics Today's Search & Discovery Article  (PDF)

UNM reports a major milestone in Optical Refrigeration: T<160K !

   Presented at IQEC'09  (postdeadline),  Published:  Nature Photonics - January 2010

UNM researchers, in collaboration with their coworkers at the University of Pisa (Italy) and LANL have now achieved the first ever all-solid-state cryogenic operation using laser cooling of a Yb-doped crystal down to 155 K ! (April 28 2009).  Graduate students Denis Seletskiy and Seth Melgaard (Sheik-Bahae's Group ) achieved this by exploiting sharp resonance in the Stark manifold of Yb:YLF, thermal load management and a resonant cavity enhanced approach. Another new redord that was achieved in this experiemnt was a cooling power  of 120 mW, nearly twice the earlier record obtained in Tm:ZBLAN (also by UNM). The Yb:YLF cystals were grown by Mauro Tonelli's group (Dr. Stefanao Bigotta) at EST-CNR, Dipartimento di Fisica, Universita di Pisa, Italy.



Earlier record cooling down to 195K was reported in a paper at the SPIE's Photonics West conference in San Jose, CA on Jan. 29.  Paper 7228-14 (Seletskiy, et al.).



MURI Review and LCS '05 Workshop

LCS '05

LCS '04





G. Rupper, N. H. Kwong, Ch.-Y. Li, R. Binder, and M. Sheik-Bahae, " Effect of n-p-n heterostructures on interface recombination and semiconductor laser cooling "  J. Appl. Phys.  108, 113118  (2010)  (pdf)


D. Seletskiy, M.P. Hasselbeck, and M. Sheik-Bahae, �Resonant cavity-enhanced absorption for optical refrigeration�, Appl. Phys.  Lett.  96, 181106 (2010)


  W.M. Patterson, M. Sheik-Bahae, R.I. Epstein, M.P. Hehlen, �Model of laser-induced temperature changes in solid-state optical refrigerators,� J. of Appl.  Phys107, 063108 (2010)


W.M. Patterson, Denis Seletskiy, M. Sheik-Bahae, R.I. Epstein, M.P. Hehlen, �Measurement of Solid-State Optical Refrigeration by Two-Band Differential Luminescence Thermometry,�  J. Opt. Soc. Am. B 27, 611-618 (2010).


D. V. Seletskiy, S. D. Melgaard A. Di Lieto, M.  Tonelli, and M. Sheik-Bahae, "Laser cooling of a semiconductor load to 165 K," Optics Express, Vol. 18, pp.18061-18066 (2010) .


M. Sheik-Bahae and Denis Seletskiy �Laser Cooling in Dense Atomic Media�, Nature Photonics, 3, 680-681 (2009).

Denis V. Seletskiy, Seth D. Melgaard, Stefano Bigotta, Alberto Di Lieto, Mauro Tonelli & Mansoor Sheik-Bahae, "Laser Cooling of Solids to Cryogenic Temperatures," Nature Photonics, Januray 2010 (Online)    (pdf)


M. Sheik-Bahae and R.I. Epstein, "Laser Cooling of Solids", Review Article,  Laser & Photonics Reviews, (2008) (pdf)

M. Sheik-Bahae and R.I. Epstein, "Optical Refrigeration: Advancing toward an all-solid-state cryocooler", Invited Progress Article, Nature (Photonics), Vol. 1, 693-699 (2007) (pdf)

W. Patterson, M. Sheik-Bahae, S. Bigotta, D. Parisi, M. Tonelli, and R. I. Epstein, "Anti-Stokes luminescence cooling of Tm3+-doped BaY2F8," Optics Express, Vol. 16, No. 3, 1704 (2008) (pdf)

B. Imangholi, M.P. Hasselbeck, M. Sheik-Bahae,R. I. Epstein, S. Kurtz, "Effects of epitaxial lift-off on interface recombination and laser cooling in GaInP/GaAs heterostructures”  Appl. Phys. Lett. 86, 81104 (2005) (pdf)

M. Sheik-Bahae and R. I. Epstein, “Can Laser Light Cool Semiconductors?, Phys. Review Lett. . 92, 247403 (2004) (pdf)

B. Imangholi, M. P. Hasselbeck, and M. Sheik-Bahae, “Absorption Spectra of Wide Gap Semiconductors in the Transparency Region” Opt. Comm. 227,  337-341 (2003). (pdf)

Hoyt, C., M. Sheik-Bahae, et al., Advances in laser cooling of thulium-doped glass. J. Opt. Soc. Am. B ,. 20,  1066-1074(2003). (pdf)

C. W. Hoyt, M. Sheik-Bahae, R. I. Epstein, B. Edwards, J. Anderson “Observation of anti-Stokes fluorescence cooling in Tm-dopes glass”,  Phys. Rev. Lett. Vol. 17, 3600 (2000)  (pdf)

New Book

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