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Interesting discussion. Thought experiment: Perhaps a Brewster's angle setup could be used to combine two polarized beams using only a flat glass optic? One laser's beam would be directed at the glass at Brewster's angle with polarization parallel to the surface; this beam would be almost...

First of all I would like to thank you for going through all of this. But I would like to know more about the trip to the U.S. from Canada. Wouldn't the lasers/parts have to be declared as such when crossing the border, and what if any risks are there? Thanks, T.

Consider that a laser powerful enough to slice through a redwood tree would also heat and ionize the gaseous products from the cutting, if not the air itself, with resultant defocusing/degradation of the beam from thermal effects and absorption. Perhaps a better (if not far more time-consuming...

"Brown" is just very dim orange. A pyro buddy of mine told me a story about a group discussion that started about the possibility of "brown" fireworks stars for aerial shells. There is no way to do it directly. The way it was finally achieved, someone built a shell with a mix of brilliant white...

You might consider running your 3W laser beam through another large telescope to recollimate/increase the beam diameter/decrease the divergence so as to produce the smallest "spot" possible at the Moon reflector.:beer: T.

Re: CLOSED: Taking payments ROUND 4!: THE "Skylaser" (laserBtB) groupbuy! Got 'em yesterday (been playing with them :na: and not posting ;) ). NICE GREEN! LOVE this (515-520) color! Thanks for the tripod and diffraction caps. Most of all, kudos to Offroad and Kevin for another great GB! :beer: T.

Re: CLOSED: Taking payments ROUND 4!: THE "Skylaser" (laserBtB) groupbuy! I got the text message about an hour ago, my lasers are to be delivered tomorrow!:drool: :beer: Nice thing about the HL hosts in the above pics, that flat spot toward the back of the host is a perfect place for a strip...

Re: CLOSED: Taking payments ROUND 4!: THE "Skylaser" (laserBtB) groupbuy! Ditto that.:beer: I just hope I don't have to fill out accession forms - again. :na: T.

Ran across this interesting thread, I may have something to contribute toward the generation of "random" dots/sparkles. I have a jar of "Glowble Metalflake", a product intended to be added to transparent automotive finishes to give a sparkling appearance. It looks like glitter but the flake size...

Could one pass the beam of a suspect laser through a prism (preferably with the beam properly oriented at Brewster's angle ;) ), and then find and meter-measure the visible versus the IR component? Might be a good way to build a comparison library for all the different lasers out there. 2c, T.

IMHO we need that kind of new year vacation here in the USofA - and with the firecrackers too! ;) T.

Re: CLOSED: Taking payments ROUND 4!: THE "Skylaser" (laserBtB) groupbuy! +1 That's what I like to hear, I am complete agreement. :beer: Patiently waiting, T.

:thinking: For single line laser use shouldn't single-element lenses always be better than any three-element lens, which are built for chromatic correction across a wide band? Why use or even consider a three element lens except for multiple wavelengths? Thanks for the study - good info to...

Re: CLOSED: Taking payments ROUND 4!: THE "Skylaser" (laserBtB) groupbuy! Paypal sent this afternoon (Pacific time).:wave:

Payment sent! :)

Please belay my last message. Sorry about that DUHH! ;)

Re: OPEN: Taking orders ROUND 4!: THE "Skylaser" (laserBtB) groupbuy! Thank YOU Offroad, for doing/keeping up these GBs!!:beer: I've been waiting on this wavelength range for a LONG time:wave:, can't wait to see it with the 445/450 and 405 from one of the previous buys. T.

Re: OPEN: Taking orders ROUND 4!: THE "Skylaser" (laserBtB) groupbuy! Offroad, please put me down for one each of the HL515- 30mW and HL520- 50mW. Thanks! :) T

How do you get a long enough coherence length for holography from/using a diode laser? T.

Just because it's a "necro" post doesn't mean the topic is absolutely closed for discussion? :o As for the poor infinitely powerful laser, it would instantly vanish in an infinitely powerful explosion. 2c, R.