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Adjustable Mechanical Slits
Back View Opened
Front View Nearly Closed
Back View Closed
Mechanical Slit for
Click to Enlarge
The VA100(/M) Mechanical Slit and VA100C(/M) Mechanical Slit for our 30 mm Cage System provide precise adjustment of two A2 tool steel blades centered equally about an SM05-threaded through hole. Each blade is black to reduce unwanted reflections. The VA100C(/M) slit is mounted in a housing with four Ø6 mm through holes for 30 mm cage system rods; each rod can be locked in place with setscrews using a 0.05" (1.3 mm) hex key or balldriver. When mounted within a cage system, these through holes allow the slit to be oriented either vertically or horizontally. The unique design of both the VA100(/M) and VA100C(/M) mounts provides a 1-to-1 correlation between the adjustment of the precision micrometer drive and the subsequent change in slit width to within 0.001" (20 µm for the metric micrometer). The actual slit width ranges from fully closed to 0.24" (6 mm) wide with 0.025" (0.5 mm for the metric micrometer) of adjustment per revolution.
In the fully closed position, the two blades are touching. However, imperfections in the blades and the degree to which the blades are parallel can cause gaps as large as 0.001" (25 µm) in width. The slit opening remains centered on the SM05-threaded (0.535"-40) aperture as the slit width is varied. The slim profile of the mounts makes them ideal for use with compact optical assemblies. On each mount there is a bottom-located 8-32 or universal 8-32/M4 mounting hole that is compatible with our standard Ø1/2" posts. Each mount also has a through hole that is SM05 threaded on both sides. The back side threads are 0.24" (6.2 mm) deep on every mount, while the front side threads are 0.09" (2.4 mm) deep on the VA100(/M) and 0.09" (2.2 mm) deep on the VA100C(/M). This SM05 threading allows for compatibility with a variety of Thorlabs' products, including mounted optics and Ø1/2" lens tubes.