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Hello. I'm not ready to try it yet, but I'd like to get all my ducks in a row before I do. How is a laser (say red) actually focussed? Whatever the size of the dot, it appears to the eye as a speckly blob. How can one see tiny variations in focussing accuracy? (Not to mention with an invisible...

If it's dim through the safety glasses, can't you just make a small fluorescent area on a piece of card (eg. with a highlighter) and shine it at that? Talking of UV, is it possible to focus the fairly cheap 3-5v modules from eg Aixiz to a 0.1mm dot, with a depth of field of say 3-5mm so that...

Hi all - I'm wondering if multiple (say red) lasers are available in a single package? A line of ten with a separation of 2mm would be perfect. Or alternatively SMD ones that i can solder myself? Ideally including mini lenses for parallel beams.. It doesn't sound that outrageously esoteric to...

Hi - For burning (or rather heating, in actual fact, say 1-2W) lasers, I've been searching for single mode types, for ease of focussing, as I thought. But unfortunately they don't seem to be that thick on the ground. Is this a bit pointless? Can multi-mode types be used almost as easily? (How?)...

They are rather expensive (I know, no price on eyesight..) so I thought I'd try various cheaper ones first, sending back those that are no good. But what will be good / no good? I wondered if there was any chance of people kindly donating pairs of comparison pics of: A beam hitting a white...

Hi, As there's no newbies forum, I'll just dive in here. Sorry if it's all a bit basic - it's not for lack of googling! 1: I want to burn... YouTube is full of people making smoke, engraving black plastic etc, as if it's no problem. I'm experimenting with an LPC836 with an Aixiz (?) coated...