used are caused largely by the laser waist focal position variation the beam lateral position variation requires that first lens 30 be mounted in such a way that its center could be shifted and then locked in position the variability of the waist focal position is overcome by mounting lens on a bracket or mount moveable in the z direction of the optical axis and then locked in position the angular pointing errors were compensated in combination with aom pointing as will be explained later the red lasers were laser diodes and were much more highly divergent first lens 30 for the red laser was of a stronger power to collect the more highly divergent light and forming the desired waist size in aom assembly 40 it also has lateral position adjustments and focal z adjustments the focal adjustments are of two types moving lens 30 with respect to the laser diode and then sliding the laser assembly and lens as a unit to position the waist in aom assembly 40 the motion of the laser diode with respect to laser assembly 20 affects both the waist size and position while the overall motion of laser assembly 20 and first lens 30 moves the waist to aom assembly 40 position aom assembly 40 has variability of small crystal.