Method for discriminating {TAIL ~ anomaly} in {HEAD ~ gas composition} and discharge excitation type gas laser oscillator 
Method for discriminating { TAIL ~ anomaly } in { HEAD ~ gas composition } and discharge excitation type gas laser oscillator
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH