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I picked up some of the 633 nm diodes for a project just like this. I haven't gotten around to developing it yet. I do have access to liquid nitrogen, though. At LN2 temperature, the wavelength shift is noticeable but considering the expense of these diodes, LN2 cooling is not something I want...

Mosfet is a good idea as well. However, it increases the drain on batteries and produces more heat, which I'm trying to minimize. A regular ol' switch seems to be the most efficient for changing resistor values. Spec sheet says AMC7135 has a dropout of 120 mV. That's quite good. With AMC7135s in...

I think I mentioned this many times, but CNI is not worth importing directly from anymore if you are in the USA. The import taxes are way too high - you will easily exceed $500 for a 589 nm module after shipping and taxes. They do not sell complete pointers to the USA. There are some USA and EU...

I'm doing this with red diodes, so the voltage and amperage requirements are not so high. LM338 is a good idea. Maybe AMC7135 would do the trick as well. The dropout voltage of these regulators can be quite high, though...

My reading suggests that laser diodes need to be run in series in order to achieve a balanced load across both LDs, so as not to overdrive one and underdrive the other - with catastrophic results. This may not be so much of an issue if the diodes are similar (same substrate and electrical...

The datasheet you provided is for a 60 W array, not 80 W.

You gotta work on your internet search skills, or put more effort into it. Try Laserglow.com. You're not going to get yellow or blue DPSS without paying hundreds of dollars for it, barring a very lucky find. It's just how the market is (I think Encap sufficiently summarized that). For direct...

If you want to stay with 3-5 mW, go with a 5 mW 635 nm laser. These can be bought cheaply, and with wall adapters for unlimited run times. The power is low, so heat won't be a problem either. While I can perceive a difference between the colors in my signature and the wavelengths they represent...

If you MUST (or really want to) use a laser, go with red. Common red laser wavelengths are brighter than common blue laser wavelengths for the same power. Green is better but if you have trouble perceiving that wavelength, red is better than blue. I probably wouldn't go beyond 15-20 mW to avoid...

Interesting application for a laser. I'd caution against this with lasers more powerful than 5 mW because reflections from the screen can cause permanent injury to your eyes or the eyes of anyone that may cross the beam. Lasers also have the potential to destroy the pixels in your display. You...

Using a convex lens to focus the laser beam onto the surface you want to burn will increase power density. An inexpensive 100-200 mW red laser module will do just fine for this. They can be found commonly on eBay in configurations that are mountable with wall adapted power supplies. These types...

Another option is to build one or have someone build one for you. Approximately where are you located?

I'm interested in these 685 nm diodes. Even though it's not bright and the color isn't going to be unique, I'd like to have one for the novelty. Wavelengths on the edge of the visible spectrum are pretty interesting in their own way, especially as a point of comparison. 50 mW is about right for...

If you navigate to the page that lists the product family for that diode, there is a table that indicates that it is single mode. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5260 You'll have to scroll down a bit to get to the 904-960 nm diodes. A general rule of thumb (not always...

All of this seems reasonable. I haven't done the math to check what it would take to get divergence that low but it seems possible with the right optics. It's possible to achieve under 1 mRad divergence with a single aspheric collimator. And a beam expander will be able to reduce divergence...

When I bought a CNI 589 nm module in 2019, I had no issues with customs but the cost was increased artificially due to heavy import taxes. Something else to consider.

Interesting. It looks like this host has less space to work with. What is the overall length?

It's easier if you can cut off the threads from the cap. I'll also usually file down the knurling on the cap so the press fit isn't as tight. This makes it easier to disassemble if repairs or upgrades are needed later!

Has anyone measured the divergence of the 525 nm FAC diode before external optics? I mean the "raw" divergence of the FAC "square beam" diode. It's too late to go down to the garage and measure it myself... but I'm looking into optics for these diodes.

Nice job! I'm glad to see your collection is growing. The chrome is my favorite but the black and gold looks pretty slick as well.