![]() ![]() A Ø9 mm laser diode can be directly installed into the tube with the included retaining ring, while a Ø5.6 mm laser diode can be installed with the use of the included adapter kit. The SPW301 spanner wrench can be used to install any of our Ø5.6 mm or Ø9 mm laser diodes in the collimation tube. However, the lens in these collimation tubes is not meant to be replaced. ![]() The large travel range of the optic ensures that these collimation tubes can be used to collimate any of Thorlabs' laser diodes that emit within their AR coating range. The lens translates inside the tube without rotation for enhanced pointing stability. Rotation of the cap by 5° corresponds to a linear displacement of the lens by 5.5 µm, and an engraved scale on the actuating cap allows for accurate lens positioning. The position of the lens can then be locked using the external locking ring. The position of this lens can be adjusted by up to 2.5 mm (0.1") by rotating the cap on the end of the tube. Thorlabs' Adjustable Laser Diode Collimation Tubes are shipped with an aspheric lens (collimation optic) premounted.
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