Cassegrainian mirror arrangement for lasers

Claim 1

A mirror system for controlling a supply laser beam comprising a housing, an opening in said housing, a first mirror disposed at an angle with respect to said opening, said mirror having a flat reflective surface and positioned to reflect the supply laser beam passing through said opening substantially 90* from the direction of travel of the supply laser beam, said first mirror having an opening disposed centrally thereof; a second mirror disposed forwardly of said first mirror and having a concave reflective surface and positioned to reflect the laser beam reflected from the reflective surface of the first mirror and defining an aperture through the reflective surface thereof, means for supporting said second mirror relative to said housing; a third mirror disposed within said first mirror opening and having a convex reflective surface positioned to convergingly reflect the laser beam reflected from the reflective surface of the second mirror outwardly through said aperture, independent means for adjusting each of said mirrors relative to one another to control the laser beam, said independent adjusting means for said first and third mirrors comprising a support ring fixedly disposed in said housing rearwardly of said mirrors, and defining a central opening, spaced adjusting locked screws positioned about said ring and engaging the back surface of said first mirror, for aadjusting the angle thereof, a second support ring, means supporting said second ring on said first ring concentrically thereof, said second support ring having an opening therein aligned rearwardly of said first mirror support opening, said third mirror having a body portion extending through said aligned openings, means securing said body portion to said second ring, a first set of lockable adjusting screw means positioned in said second ring and engaging said first ring for angularly and axially adjusting said third mirror, and a second set of adjusting screw means secured to said second ring for radially adjusting said third Mirror, said independent adjusting means for said second mirror comprising a support for said mirror; adjustable screw means disposed about said third mirror support for connecting the same to said housing; a first set of adjusting screws dispposed on said third mirror support and engaging the rear surface thereof for angularly and axially adjusting said mirror with respect thereto and a second set of adjusting screw means radially disposed with respect to said support and said third mirror for radially adjusting the same.