Breaking the low phonon energy barrier for laser cooling in rare-earth doped hosts

被引：0
|
作者：
Nemova, Galina [1 ]
Kashyap, Raman [1 ]
机构：
[1] Ecole Polytech Montreal, Dept Engn Phys, Montreal, PQ H3C 3A7, Canada
来源：
LASER REFRIGERATION OF SOLIDS IV | 2011年 / 7951卷
关键词：
laser cooling of solids; super-radiance; super-fluorescence; SUPERRADIANCE REGIME; CRYSTALS;
D O I：
10.1117/12.874066
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A new approach to cool rare earth doped solids with optical super-radiance (SR) is presented. SR is the coherent, sharply directed spontaneous emission of photons by a system excited with a pulsed laser. We consider an Yb3+ doped ZBLAN sample pumped at the wavelength 1015nm with a rectangular pulsed source with a power of similar to 700W and duration of 20ns. The intensity of the SR is proportional to the square of the number of excited ions. This unique feature of SR permits an increase in the rate of the cooling process in comparison with the traditional laser cooling of the rare earth doped solids with anti-Stokes spontaneous incoherent radiation (fluorescence). This scheme overcomes the limitation of using only low phonon energy glasses for laser cooling.
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页数：9
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