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Hello. I'm new to this forum, and just recently started to get interested in lasers. I am a mechanical engineer but so far in my career never seriously using laser. After googling for some hours I found this site looks very informative.

My project is to make a laser beam expander so that a laser beam can be focused far away from the source. I have read some sources on the internet but it ended up in "collimate the laser". For example galilean telescope. What I need is not just collimating, but to focus laser beam (waist become...