Acquisition of an IR Tunable Picosecond Laser System

提出了用红外可调谐皮秒激光系统对晶体、聚合物和玻璃态固体中的分子缺陷进行整个红外光谱范围内的抽运探测皮秒测量。调谐到红外振动跃迁的能力将使首次系统研究能量转移过程成为可能，而整个固体仍处于电子基态。需要为康奈尔远红外实验室购买一个激光系统，该系统产生波长从1.5微米到8微米可调的高强度红外脉冲。该系统由一台高能量锁模Nd：Y3+石榴石激光器组成，其部分倍频输出用于泵浦一组皮秒级染料激光器。然后，将染料激光输出与Nd：YAG激光的基本原理混合在一个非线性晶体中，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.