Laser cooling in the condensed phase by frequency up-conversion
Laser cooling in the condensed phase by frequency up-conversion
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DOI：
10.1103/physrevlett.76.2037
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发表时间：
1996-03-18
影响因子：
8.6
通讯作者：
Rumbles, G
中科院分区：
文献类型：
--
作者：
Clark, JL;Rumbles, G
在激光染料罗丹明 101 的流体溶液中，当以 1.96 eV 激发到距 0-0 能带原点 0.15 eV 的低能量吸收尾部时，观察到频率上转换。发射强度与温度相关，并且被证明是对样品温度的出色测量。我们首次展示了该光谱区域的强烈激光照射如何通过上转换过程去除热能，从而降低样品的温度。当用 1.96 eV 的 350 mW 激光照射时，热容量为 3 J K-1 的样品温度会以 0.7 K h(-1) 的速率下降。
Frequency up-conversion has been observed in fluid solutions of the laser dye, rhodamine 101, when excited at 1.96 eV into the low energy absorption tail 0.15 eV from the 0-0 band origin. The emission intensity is temperature dependent and is demonstrated to be an excellent measurement of the temperature of the sample. We show for the first time how intense laser irradiation in this spectral region leads to the removal of thermal energy by the frequency up-conversion process, and thus lowers the temperature of the sample. A decrease in temperature at a rate of 0.7 K h(-1) is demonstrated for a sample with a 3 J K-1 heat capacity, when irradiated with 350 mW of laser light at 1.96 eV.