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Optical collimators can be used to calibrate other optical devices, to check if all elements are aligned on the optical axis, to set elements at proper focus. 

An optical collimator consists of a tube containing a convex lens at one end and an adjustable aperture at the other, the aperture being in the focal plane of the lens. Radiation entering the aperture leaves the collimator as a parallel beam, so that the image can be viewed without parallax.

Fiberpark's Polarization maintaining collimator is basic component of many PM devices, such as PM Isolator and PM FWDM, this kind of collimator make a feature of high extinction ratio, low insertion loss, high return loss. Due to excellent coating technic, the collimator can load high optical power.

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