Acquisition of an IR Tunable Picosecond Laser System

提出了利用红外可调谐皮秒激光系统对晶体、聚合物和玻璃状固体中的分子缺陷进行皮秒泵浦-探针测量的方法。当整个固体保持在电子基态时，调谐到红外振动跃迁的能力将使对能量转移过程的首次系统研究成为可能。康奈尔远红外实验室申请资金用于购买一种激光系统，该系统可以产生波长在1.5微米到8微米之间可调的高强度红外脉冲。该系统由一个高能锁模钕钇铝石榴石（Nd:YAG）激光器组成，其部分输出频率翻倍，用于泵送一组皮秒染料激光级。然后通过在非线性晶体中混合染料激光输出与Nd:YAG激光的基波产生红外辐射。

It is proposed to make pump-probe picosecond measurements on molecular defects in crystalline, polymeric and glassy solids throughout the infrared region of the spectrum with an infrared- tunable picosecond laser system. The ability to tune to infrared vibrational transitions will make possible the first systematic investigation of energy transfer processes while the entire solid remains in the electronic ground state. Funds are requested for the Cornell Far Infrared Laboratory to purchase a laser system which generates high intensity infrared pulses with wavelengths tunable from 1.5 microns to 8 microns. This system consists of a high-energy mod-locked neodymium yttrium aluminum garnet (Nd:YAG) laser, part of whose output is doubled in frequency and used to pump a set of picosecond dye laser stages. Infrared radiation is then generated by mixing the dye laser output with the fundamental of the Nd:YAG laser in a nonlinear crystal.