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Old 08-29-2013, 07:00 PM #1
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Default Expanders vs Collimators

Hi guys

As far as I can see beam expanders change the size and divergence of a laser. Collimators collimate the light.

One article I read claims "Beam expanders improve a beamís collimation" so my question is why do we have both items if beam expanders can collimate beams?????

What are the practical uses of these?


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Old 08-29-2013, 09:45 PM #2
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Default Re: Expanders vs Collimators

Beam expanders recollimate collimated light. If you have a collimated laser that has a divergence of ~1.5mRad (arbitrary number), a 10x beam expander will reduce the divergence to 0.15 mRad. A collimating lens is used to collimate the laser light that is being emitted from the laser diode, a beam expander is used to collimate a laser's already-collimated beam. This gives the laser a nice and straight (albeit thicker) beam
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Old 08-31-2013, 12:31 AM #3
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Default Re: Expanders vs Collimators

Your confusion arises because you haven't realized beam expander and collimator are one in the same.
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