The Model 12-1751 Collimation Tester is a wedged plate of interferometric
quality that is extremely useful for the adjustment of beam expander lens spacing
to achieve precise collimation. Compatible with our 50 and 52 Series
Beam Expanders, the collimation tester produces between 4 to 7 fringes at 632.8
nm over a 50 mm aperture and is suggested for use with visible and NIR lasers.
