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    Beam Width Question

    most of diode lasers are multimode, and will expand and become hard to focus pretty within a short distance. to answer the original question, in an ideal world when you have a well collimated laser beam, the beam will still expand due to diffraction. the angle of expansion is the wavelength of...
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    Update to my case posted in "Damaged eyes?" sticky thread - 6 years later

    Re: Update to my case posted in "Damaged eyes?" sticky thread - 6 years later You are extremely lucky to be recovered from the damage. I think this website is doing everyone a favor to make this topic sticky. It is extremely important for anyone with a cheap laser to keep it away from kids.
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    Best laser that can burn objects 20 feet away for under $400?

    yes the key thing is to get a good lens to focus nicely. you will also need to pay attention to the beam quality. the closer the beam is to a single mode, the easier and tighter you can focus it.
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    1w Blue Laser Pointer Faulty Batteries?

    Did you figure it out? you may try it with regular battery to isolate the problem.
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    Laser Pointer that Uses AAA or AA Batteries.

    I am surprised that eBay allow the sale of this, these laser can be dangerous if not handled properly.
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    mastech PS killed my cree

    Sorry for your loss, VegasF6. I am a technician with Mastech Power Supplies, and have written a tech notes about how to set current limit for Mastech Power Supplies, and you can see it at our website at www.mastechpowersupplies.com: http://www.mastechpowersupplies.com/howtosetculi.html
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