An acousto optic device is disclosed which can achieve both of suppression of secular change and {HEAD ~ prevention} of {TAIL ~ device damage} and can maintain a stabilized wavelength selection filtering operation 
of
An acousto optic device is disclosed which can achieve both of suppression of secular change and { HEAD ~ prevention } of { TAIL ~ device damage } and can maintain a stabilized wavelength selection filtering operation
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH