The compact design of our OT.5-5SF spatial filter makes it ideal for crowded beam path applications.  This compact spatial filter incorporates our OT.5-5 as the basis for this small package.  We use 80TPI adjustment screws for precise positioning of all 5 axes and uses our Soft Touch color coded knob caps for easy axis identification in low light conditions.  The Y-axis knob uses a unique capture screw design to ensure no drift due to overloading in that axis.

   The OT.5-5SF is simple to align.  The first step is a rough alignment done by eye before the device is even tied down to the experiment.  This is done by opening the iris and looking through the objective as the unit is held up toward the room light.  Adjust the vertical and horizontal position of the pinhole until a spot of light is seen.  Center this spot and then focus it with the axial adjustment.  This procedure generally results in some light getting through the pinhole when the spatial filter is positioned in the LASER beam.  Once this is done it usually only takes minor translation of the pinhole and/or tilting of the whole assembly to get into full alignment.