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