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You're bringing drama where there is none. I'm done responding to your continued off topic harassment. Go back to your "fight club", please stop bringing such conflict into everything else, and keep it about lasers. Or holography (in my case).

"You need to check that attitude Eidetical." I disagree. What's got your knickers all in a twist?

Any countertop or table is suitable for making Denisyuk type reflection holograms like those above. It's been shown that many laser pointer lasers can be used to record them, despite common thought. I encourage others here to try it, and will do whatever I can to support your efforts if you do.

Wasn't being defensive. Just didn't want to spend 15 minutes typing out the basics of gas lasers to save you 5 minutes of searching for your answer on this site or Google. And your questioning my reply told me you didn't bother to look at my profile or any of my other posts, or click on my...

Because I've been working with lasers of many types since 1980.

Great start! DCG is really time consuming and difficult because one has to get the film preparation right as well as the exposure stability. But it doesn't have to be perfect to be really cool.

Don't recall hearing about any TEA lasers other than nitrogen or CO2. Argon certainly won't work.

Good thing Gould didn't suggest light oscillation by stimulated emission of radiation.

Gordon Gould coined the acronym LASER before the first one was built. Ted Maiman originally called his invention an "atomic radio light". Bell Labs pushed the phrase "optical maser" for a few of the first years.

Look at your closets. Maybe everything can be hung higher so you can sit at a bench underneath. Locked door is great advice. A light-trapping beam dump on a heavy base right in front of a mounted laser is good to let you walk away for a few minutes so pets won't have access to the beam.

I got my first laser pointer as a gift in the mid-'90s. I think it was made by Apollo. The first pointer I bought was this battery operated He-Ne made by RMF Products in the early '80s, bought after I first joined this forum.

Can you use a volume Bragg grating? I make those in photopolymer material and could make something for you for free if it helps get me 100mW of SLM at 520nm. Wasatch Photonics sells a 1200 lpm Bragg grating for 830nm for about $400.

I'd look at an old ruby laser. Even a small one will poke such a hole into a razor blade. I made the video below over ten years ago.

Continuous lasers melt things. Because pulsed lasers vaporize, they're generally used for drilling holes. Your cheapest option is probably the conventional approach, even if you break a dozen drills. Pulsed lasers are used to drill pinholes easily down to 5 microns in stainless steel. Deja vu?

I remember how expensive green laser pointers were when those first showed up. A few years from now similar things will be available, but for now Mr. Farbe2 is freakin' KING !!! You did your own anodizing too?!? Truly awesome.

This is the 60th anniversary of the introduction of laser holography of 3D imagery. In 1982, Tung Jeong (known as "TJ") started a triennual gathering of holography scientists, artists, and technicians and business people called the International Symposium on Display Holography (ISDH) which is...

Learning about lasers and building them is a good way to acquire skills that will qualify one for a good job. Playing with laser light can be a fun and well-paid career. In the late '70s I saw an exhibit of holography and got hooked on that immediately. Went to a 2-year laser technician program...

Wonderful design and workmanship!!! I can't imaging grinding on a 5mm prism! Knocked it out of the park with this one!!

I recently made some hologram optical elements that worked at 1550nm for laser communication system use. It was to allow for rapid characterization of beam distortions via the parallel processing done by the HOE, so an adaptive optics system could undistort it. The HOEs were looking good but the...

I visited Dale Harder at HHR Lasers in Cleveland a few years ago, and bought most of his old Laser Focus and Photonics Spectra magazines. It takes real dedication to pump those old tubes but I'd be surprised if he is still doing it. If so, kudos!