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A refinement of my dual NUBM44 benchtop laser.

There's a built-in LiPo charger. Charging is happening when the light is blue.

The aperture is threaded to accept a SanWu 3x beam expander (which uses a 11.4mm x.5 thread....that exists NOWHERE).

Targeting an unhappy cardboard box. Divergence with the new optics is great. This punched a pretty neat .25" square hole in the box.

Test firing @ 4% power. Just at the threshold of lasing.

Rotary encoder selects power with nice detents. The switch on the right toggles both up and down: press down for momentary fire, up to latch. Dual bar graphs monitor diode temperature. Too hot and the latch releases and the light will blink red.

My first surface mount project. Integrated LiPo charger and dual temp monitoring.

The internet is full of great tips, like sticking all your parts down with double stick tape and marking what they are.

JLCPCB is the cheapest place I've found to make boards, and they even offer these laser cut solder masks. Makes short work of applying solder paste.

I may be Digikey's best customer.

How does a rotary encoder work again?

If you look carefully there is a phantom beam on the left because a mirror is too small. New larger mirror inbound from Opt Lasers.

the black pieces are longer versions of the brass mounts Opt Lasers sells. They needed to be longer for the extra 2x cylindrical lens. The final lens is also mounted on a sliding platform so I can fine tune it.

3D rendering of my initial optics design. I ended opting for pre-built heat sinks because I don't have a mill.

The end goal for this is actually quite stupid. It started as an annual camping trip. First came a laser that could etch our names in firewood (about 3w). Next year I doubled the power and we were able to light the camp fire (6w). This laser was supposed to meet the third year goal: light...

Fantastic, thanks for all the info cdbeam777. I actually did have analog inputs monitoring the temperature thermistors. My PC board may have been wrong or I had the Arduino configured incorrectly, because I got no power output. That's one of the things I plan to debug in v2. Screen was too...

Fantastic, thanks! I will definitely check this out.

I've had no trouble running it for several minutes at a time. More worried about what it's pointed at. The heat sinks aren't very big but they are screwed + thermal compound to a large hunk of aluminum, which is itself screwed to the aluminum case.

I wanted to see if I could make something with two NUBM44 diodes beam combined and corrected for a better beam profile and decided on a lab format to give me space for optics. I also battery powered it from a large RC car LiPo, so it's portable. I partially succeeded. The NUBM44 is really a...

PWM control via an Adafruit Trinket Pro