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With DPSS lasers, the wavelength is converted, while with diode lasers, the laser is emitted directly without conversion. Now I've noticed that other than red (standard pointers) and violet (bluray player) diode lasers, most diode-based lasers (including blue, green, and yellow) are DPSS lasers...

Here's a news story about some guy busted for shining a laser pointer at a helicopter. Quoting the story: Ha ha, PWNED! And here's what he said about the incident (also in the story). And I'm thinking, you're sure right you did something wrong and dumb. What a n00b he was to think he could do...

What does this mean? I have heard lasers (usually diodes) described as being single or multi mode. I have also heard this terminology used to describe fiber optic cables. What does it mean?

I know that scattered laser dangers aren't mentioned until Class 3b. Basically, Class 3b is danger to your eyes from even scattered light, and danger to your skin from direct exposure to beam. Class 4 is danger to your skin and eyes from even scattered light. But I'm wondering about the...

No, I'm not talking Spartan Laser, blow everything up, from Halo 3. Nor am I talking about a simple laser sight for a rifle. I closer example to this is what the US military and police are using for dazzling someone to get them to stop by producing such an optical glare that they can't see where...

This is REALLY OLD news, but I don't know if anyone here yet mentioned it. Also it points out a specific incident where someone had serious eye damage from a laser (albeit a laser weapon), so I that's why it's here in the safety section. Anecdotal evidence is often a good way of explaining...

I have seen various laser pointers on eBay and other sources claiming "5mW violet laser" or "5mW Bluray laser". Of course violet lasers are manufactured solely for their usefulness in Bluray players, so one must look to the power levels of Bluray laser diodes. I have indeed checked at...

The Bluray reading-laser in a BLuray player is actually outputing how many mW? And in a writer device, what is the output power? And how do these power levels compare to the red reading-laser in a DVD player and red writing-laser in a DVD burner, or the IR reading-laser in a CD player and the...

On ebay I so often see green laser pointers for just $5 that are rated at high power levels like 100mW. Are they REALLY 100mW? I can't believe that a $5 laser would be able to put out that much power. I mean if I put in front of a properly callibrated laser power meter intended for measuring...