TECH - Researchers demonstrate laser cooling of a semiconductor

(Phys.org)-A team of physicists working in Singapore has, for the first time, demonstrated the cooling of a semiconductor using a laser. To achieve this feat, the team, as they describe in their paper published in the journal Nature, used a pump laser at a specified wavelength to annihilate longitudinal optical phonons (LOPs) causing a lowering of the temperature of the cadmium sulphide (CdS) sample.

http://phys.org/news/2013-01-laser-cooling-semiconductor.htm