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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 beam’s collimation" so my question is why do we have both items if beam expanders can collimate beams????? What are the...

Hi guys, Doe a power meter differ in reading if the beam size is different or does it compensate for this? ie if I shine a 30mw laser at a power meter which has a 3mm dia beam will I get the same power reading if the beam was 1mm dia. Thanks :)

Hi, Is it possible to focus a laser to say a 0.1mm spot over a number of meters? How would the optics look for this? I'm looking to take some precise measurements and wonder what optics and how they are set up to achieve this. Thanks for your help.

Hi guys, I am trying to understand a bit more about lasers and have come up with some questions which I hope some of you can help with. 1) I there any relationship between wavelength and power? For example is a 1W 808nM any more or less powerful than a 1W 980nM laser? 2) What defines power...