The generator comprises {TAIL ~ an envelope} and {HEAD ~ two mirrors} defining a resonant cavity, in which is maintained a monolithic wave guide with a capillary 
The generator comprises { TAIL ~ an envelope } and { HEAD ~ two mirrors } defining a resonant cavity , in which is maintained a monolithic wave guide with a capillary
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH