In {HEAD ~ a nonlinear optical device}, {TAIL ~ a present invention nonlinear optical medium component} is transparent to both the incident and exit light frequencies 
In { HEAD ~ a nonlinear optical device } , { TAIL ~ a present invention nonlinear optical medium component } is transparent to both the incident and exit light frequencies
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH