1C4 - Infrared difference frequency generation

Several molecular vibrational frequencies have been generated by beating together a laser and laser-stimulated Raman emission. A Nd
³⁺
/glass laser was used to excite Raman emission from C
6
H
6
, C
6
D
6
, and CH
3
. NO
2
. The difference frequencies were generated in a single crystal of CdS and appeared at 992, 944, and 927 cm
^-1
, respectively. A difference frequency has also been detected at 944 cm
^-1
following mixing in CdSe. The data presented for HgS indicates that phase-matched outputs can be generated over a limited range of frequencies, provided that the Raman emission is excited with a Nd
³⁺
/glass laser. Experimental details are given and the results are discussed.