The resonator for {TAIL ~ a laser} 1 further comprising turning optics affixed to the optics plate and configured to intercept {HEAD ~ the fourth reflected beam} 
The resonator for { TAIL ~ a laser } 1 further comprising turning optics affixed to the optics plate and configured to intercept { HEAD ~ the fourth reflected beam }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD