Optical refrigeration expected to enhance airborne and spaceborne applications

January 29, 2010
Under an AFOSR, MURI grant, a team led by University of New Mexico professor, Dr. Mansoor Sheik-Bahae and graduate student, Dr. Denis Seletskiy created the first-ever cryo (temperatures that can only be obtained by liquefying gases) cooler that can be applied to airborne and spaceborne sensors. Credit: Sheik-Bahae, University of New Mexico

Under an Air Force Office of Scientific Research, multi-university grant, a team led by University of New Mexico professor, Dr. Mansoor Sheik-Bahae created the first-ever all-solid-state cryocooler that can be applied to airborne and spaceborne sensors.

This technology, which allows coolers to reach temperatures so cold that they can only be obtained by liquefying gases, may lead to advances in superconducting electronics because it would enable miniaturization for cooling purposes.

Graduate students Denis Seletskiy and Seth Melgaard designed and performed the experiments at UNM's department of Physics and Astronomy in collaboration with researchers from Los Alamos National Laboratory and the University of Pisa, Italy.

"Optical refrigeration or solid state optical refrigeration technology offers many advantages over currently used, bulky mechanical coolers because it is vibration free (no moving parts), compact, lightweight and agile (fast turn-on and off)," said Sheik-Bahae.

Previously, only solid-state coolers based on standard were able to reach temperatures as low as 170K, and even so, only with minimal efficiency.

"We obtained cooling down to 155K using optical refrigeration,"said Sheik-Bahae. "We expect that material research may lead to temperatures dipping below 77K (boiling point of ) and in the future as low as 10K may be possible," he added.

In order to achieve their results, the scientists enhanced cooling efficiency by exploiting resonances in the absorption spectrum, growing pure crystals, using thin optical fibers, keeping their sample in thermal isolation inside a vacuum and by trapping laser light in a resonant space.

In the future Dr. Sheik-Bahae and his team will continue collaborations with Professor Mauro Tonelli and his researchers at the University of Pisa in Italy as well as with Dr.

Richard Epstein of the Los Alamos National Lab. Together they plan to research product purity and new materials for cryocoolers.

"We are also pursuing optical pump sources that can further enhance cooling efficiency of the devices," he said.

Explore further: A Pinch of Iron - Key to the Development of Magnetic Refrigerators

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vivcollins
not rated yet Jan 29, 2010
Would love to know more about that, for instance how much heat can it move at those temperatures?
seneca
not rated yet Jan 30, 2010
This is an important finding, as the lifetime of infrared telescopes like Spitzer or Planck is limited by the amount of helium supplies, which are used for their cooling.

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