elongated hollow stalk 60 having a first end 62 adapted to threadably receive mirror 21 and a second end 64 anchored on a fixed support member 66 outside of workpiece holder 30 cooling means for cooling the optic means 19 will now be described stalk 60 includes a stalk bore 68 with an internal stalk bore surface 70 forming an enclosed stalk passageway 72 that extends longitudinally along stalk bore axis 74 and terminates in first end 62 and second end 64 an elongated hollow fluid inlet tube 80 extends longitudinally along stalk passageway 72 and terminates in an open end 82 adjacent to mirror 21 on first stalk end 62 tube 80 forms a first passageway for carrying cooling fluid to mirror 21 stalk bore internal surface 70 and external surface 84 of tube 80 form a second passageway for carrying fluid out of stalk bore 68 via second stalk end 64 cooling fluid can be recirculated by conventional means not shown such as a pump and fluid storage tank or used once and discharged additional means for cooling the workpiece 1 will now be described a first jacket 90 is positioned surrounding external surface 34 of workpiece holder 30 adjacent first end 42 thereof first jacket 90 is a hollow housing 92 having a pair of spaced apart sidewalls 94 extending radially outwardly with respect to workpiece external surface 34 sidewalls 94 are positioned in close proximity to each other preferably 4 inches apart a cross member 96 connects sidewalls 94.