Recent content by Analogue

This is very interesting; I'm surprised that there are no replies yet. I'll start. The original research article is not pay-walled and can be found here (just click on the pdf link): https://www.osapublishing.org/ol/abstract.cfm?uri=ol-44-3-622 One technique uses scanning but reproducing this...

Navy Breaks World Record With Futuristic Free-Electron Laser - FoxNews.com

U.S. Navy’s giant laser beam program achieves ‘milestone’ An ONR design project has made a breakthrough allowing for 100 KW continuous operation tunable free electron lasers. They are envisioned for ship use in shooting down incoming missiles etc. The video in the link is fairly informative...

Thanks for posting that Dave. Excellent link!

A fan of Neil Stephenson and the golden ratio/Fibonacci numbers. Nice!

So fire broke your heart and then your plasma poured fourth. Perhaps this could be considered a case of stimulated emission?

German researchers have modified the principle of laser construction to create a Bose-Einstein condensate at room temperature. An overview of the research can be found here: Researchers get trapped photons to act like massive particles

Benm has the right idea. Put the expensive exotics together and let the popular frequencies have their own boards.

I have one of these rated at 200 mW. After warming up, it outputs 200 mW, but about 70-71 mW is IR. So it burns like 200 mW but is as bright as about 130 mW of 532 nM. Edit: Oh, and the 5 min duty cycle is about right. The focusing ring is very convenient. I have used this laser for doing wood...

I wonder if you would get rabbit powers if he bit you? Which rabbit powers would you want?

I don't have one with the locking tail cap, only the one with the "screw hole". Anyway, putting on that cap, one turns the screw clock-wise to "arm" the laser. As you turn the screw in the cap, you will feel positions where the screw wants to stop. Those locations represent different currents to...

I thought that people here might find the following article interesting. A small helicopter was powered by laser pointers. Ascending Technologies and LaserMotive create a new record. | sUAS News I wonder if it wouldn't be too difficult to pull this off at home. They seem to set a flight...

Benm-- Thank you for your comments! You raise the question of the consistency of the Hoya R-72 filters. Honestly I don't know how up to spec they usually are, or how the product may have changed over the years, or how much variance there is in the product line, so calibration makes sense. You...

Thank you Mike. :thanks: The only IR absorbing lens I have played with was from an old point-and-shoot digital I took apart-- and it had horrible green transmission-- I recall it transmitting something like 30% of green. (I originally toyed with the idea of using it on one of my TriAngle...

Vega-- I just posted a how-to for accurately measuring IR: http://laserpointerforums.com/f51/using-hoya-r-72-ir-transmission-filter-measure-ir-dpss-lasers-videos-57036.html I hope it is helpful.