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This is going to suck. But perhaps the LPF community could form some sort of laser reshipping service.

A few days ago, I was trying to measure the divergence of a generic laser pointer (it was really bad, like 6 mrad or something) when I noticed a very faint beam. This only happens when I look in the direction of the source of the laser. Under normal circumstances, I could never get a visible...

Are lasers from certain sellers better than the others, or are they all about the same?

But it's OK, they're professionals. :rolleyes:

The beam divergence and diameter are greater than advertised, but it seems you got a really nice laser otherwise. If only other laser companies would offer 800 mW green lasers at these prices... P.S. What tripod are you using?

It seems many of the "5 mW" 405 nm lasers on eBay are really good deals. But before I consider making a purchase, there are a few more things I'd like to know: 1. Do flashlight-style lasers have higher outputs that pen-style ones? 2. How is their overall build quality? For instance, will the...

From the description, it's possible that the boat was hit by two different lasers.

Re: World's First Direct Diode 476nm Laser Pointer! The beam looks pretty thick in the pictures, though. Is the beam diameter really that large, or is it just the camera?

Re: World's First Direct Diode 476nm Laser Pointer! I take it these are single-mode?

I doubt we need to collect our own data as I'm sure some academic paper out there already has the figures. On the other hand, finding those papers probably isn't going to be easy.

From my understanding of nonlinear optics, laser crystals are only effective at certain wavelengths, but they become more efficient as the input power is increased. This may explain the existence of "freak" units with absurdly high powers. This got me thinking: it would be cool if there were...

Interesting story here: LIDAR system uses lasers to detect clear air turbulence before it hits

For what it's worth, green DPSS lasers can theoretically convert 808 nm to 532 nm light at up to 48% efficiency (60% for Nd:YVO4 times 80% for KTP) in perfect conditions. However, it would be extremely difficult for a laser to sustain such conditions. It's probably also possible to overdrive the...

From what I've read, the intensity of sunlight that reaches the Earth's surface is about 1 kW/m², or 100 mW/cm². For instance, a 500 mW laser would supposedly have the same burning power as a ~2.5 cm convex lens. But one thing I've noticed is that laser light seems to burn better than focused...

This video shows what is supposedly a 1.5 W green laser popping a row of 190 (!) balloons. According to the description, the laser was built from a 800 mW Lasever module, yet the author measured the output at 1,500 mW. However, it's rare for a green handheld laser to exceed 1 W in output, let...

The subscript and superscript tags (which are very useful in technical discussions) have not worked ever since the switch from YaBB to vBulletin. Several users (including myself) have requested this feature, but it was never re-implemented. Is there any reason why it can't be done?

Well, I found a video of someone doing it with a 1.2 W laser. I imagine a high-end Hercules could do it too if it were focused.

Has anyone here ever tried to light a wire sparkler with a laser? If so, did you succeed, and how much power did you use? I imagine the power required must be fairly high because these things seem a lot harder to light than regular fireworks.

I don't think it's fair to judge a person's knowledge by their post count. For all we know, he could be a hobbyist that just found out about the forum.

I would avoid it as WarnLaser doesn't have a great reputation around here.