Multipass nonregenerating laser amplifier crystal

Claim 1

A MULTIPASS NONREGENERATING LASER AMPLIFIER CRYSTAL COMPRISING: AN ELONGATED CRYSTAL BODY HAVING EXTERIOR PLANAR SURFACES; A FIRST END FOR THE BODY INCLUDING MEANS DEFINING A FIRST CRYSTAL-TO-AIR INTERFACE PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID CRYSTAL AND ADAPTED TO SERVE AS AN INGRESS PORTION OF THE CRYSTAL FOR RECEIVING LASER LIGHT AND DIRECTING THE LIGHT IN A FIRST PASS ALONG A FIRST LONGITUDINAL PATH EXTENDING PARALLEL TO SAID LONGITUDINAL AXIS OF THE BODY AND TERMINATING AT A SECOND END OF THE BODY; A FIRST TOTAL INTERNAL REFLECTING SURFACE DISPOSED AT THE SECOND END OF THE CRYSTAL BODY ARRANGED DIAGONALLY ACROSS SAID FIRST LONGITUDINAL PATH FOR DIRECTING THE LIGHT ALONG A FIRST TRANSVERSE PATH AT RIGHT ANGLES TO SAID FIRST LONGITUDINAL PATH; A SECOND TOTAL INTERNAL REFLECTING SURFACE DISPOSED DIAGONALLY ACROSS SAID FIRST TRANSVERSE PATH FOR DIRECTING THE LASER LIGHT IN A SECOND PASS THROUGH THE BODY ALONG A SECOND LONGITUDINAL PATH PARALLEL TO SAID FIRST LONGITUDINAL PATH AND EXTENDING TO SAID FIRST END OF THE CRYSTAL BODY; A THIRD TOTAL INTERNAL REFLECTING SURFACE DISPOSED DIAGONALLY ACROSS SAID SECOND LONGITUDINAL PATH FOR DIRECTING THE LASER LIGHT ALONG A SECOND TRANSVERSE PATH AT RIGHT ANGLES TO SAID FIRST LONGITUDINAL PATH AND EXTENDING IN A COMMON DIRECTION WITH SAID FIRST TRANSVERSE PATH; AT LEAST A FOURTH TOTAL INTERNAL REFLECTING SURFACE DISPOSED DIAGONALLY ACROSS SAID SECOND TRANSVERSE PATH FOR DIRECTING THE LASER LIGHT IN A THIRD PASS THROUGH THE CRYSTAL BODY ALONG A THIRD LONGITUDINAL PATH EXTENDING PARALLEL AND IN A COMMON DIRECTION WITH SAID FIRST LONGITUDINAL PATH TO SAID SECOND END OF THE BODY; AND A SECOND CRYSTAL-TO-AIR INTERFACE PARALLEL TO SAID FIRST CRYSTAL-TO-AIR INTERFACE DISPOSED ACROSS THE THIRD LONGITUDINAL PATH ADAPTED TO SERVE AS AN EGRESS PORTION OF THE CRYSTAL FOR PASSING LASER LIGHT FROM THE CRYSTAL BODY.