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  1. RA_pierce

    Laser diodes in series or parallel?

    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...
  2. RA_pierce

    DIY spectrometer and 633nm diode

    This weekend I decided I would measure the wavelengths of a few lasers I have. Using a diffraction grating, some scrap plywood, and spare hardware, I assembled a simple setup for measuring the wavelength of any visible laser. Construction: A 1.15 meter length of plywood was drilled to hold 4...
  3. RA_pierce

    Hand-made Aluminum-Bronze host & 561 nm laser

    Here's my latest project: a 561 nm laser installed in a hand-made aluminum-bronze host. When I say hand-made, I mean I formed the host from stock using hand saws, files, abrasive paper, and tapped the threads by hand. The only power tools involved: drill press and belt sander. Here are some...
  4. RA_pierce

    M462 diodes - Where did they go?

    Does anyone know what happened to the M462 diodes? These were my favorite of the multimode blues but I didn't buy enough of them. My last one was accidentally smushed during an act of brutal negligence. I've looked high and low but they seem to have disappeared. If anyone has a spare or two...
  5. RA_pierce

    Sneak peek of a 561 nm project

    Normally I will post when a project is complete but I'm excited to have the electrical work done (just some simple wiring of components) and wanted to show it off. Its a 561 nm module from SuckPit doing about 3 mW. The laser is pulsed. Its going to be installed in a hand-made aluminum-bronze...
  6. RA_pierce

    589 nm Cu-Ni & Ti Host

    Last year I ordered a 589 nm laser module from CNI with plans for something special. Those of you who know my work will know I generally prefer to build simple pens. However, I have lots of plans for more unique designs. My main limitation is the work space and tools needed to produce them...
  7. RA_pierce

    Review: 2W 405 by thanhtung

    When I saw the thread, I had to have it. I took a look at the diode characterisitics and thought, "finally, a multimode diode with a respectable divergence angle." Yes, that's right. A multimode violet laser capable of close to two Watts out the barrel and low (relatively) divergence. Now, the...
  8. RA_pierce

    685nm and 690nm laser diodes

    I have been looking for some interesting red wavelengths to add to my collection. 685nm diodes can be found on eBay at ~15mW but I would like more power than that. During my search, I stumbled upon these: 685nm 50mW 690nm 35mW Just thought I'd share in case anyone else is interested. I may try...
  9. RA_pierce

    WTB LPC-840 diodes

    Hi, everyone. I'm looking for two LPC-840 diodes. It seems they are the best since the 815s years ago. I prefer not to order from China. Does anyone in the USA have a couple spares they are willing to part with?
  10. RA_pierce

    Optically corrected pen: MM 638 V1

    I've been planning this project for a long time but finally had some time to get around to setting it up today. The idea: Make a tiny, optical correction assembly to improve the beam quality from high power multimode diodes while minimizing losses and cost. The materials: HL63193MG 638nm...
  11. RA_pierce

    NEEDED: Custom Brass Lens Holder

    Hi, everyone, especially machinists offering their services. I am in need of a brass M9x0.5 lens holder designed for a lens with a diameter of 4mm. The design is simple since I will use adhesive to set the lens in the back of the holder (the side facing the diode) since it needs to approach the...
  12. RA_pierce

    Feeler: Universal Laser Labels *Photos Added*

    Hi everyone. I have been testing out some products to make custom laser warning labels and found a source that I think provides a good balance of quality and low cost. These labels are 1" x 1" with rounded corners printed on clear vinyl with a strong adhesive that can be removed easily with no...
  13. RA_pierce

    Police saw my lasers + laser pr0n

    While I was setting up and experimenting for some laser photos earlier tonight, I was visited by a stranger and a police officer. I went out to the back roads on the outskirts of the city because there is some scenic, flat, undeveloped land out there with lots of distant stuff to point beams...
  14. RA_pierce

    495nm Leadlight

    I managed to snag one of these new 495nm diodes (thanks!). Here is my chrome Leadlight pen (of course) built with this diode. G lens Flexdrive I didn't bother setting the current because I wanted to fire it up right away. It's somewhere in the low range for the Flexdrive, between 65-100mA...
  15. RA_pierce

    Sharp 638nm 185mW Pen

    My collection is filling out now. The latest installment is another chrome pen fitted with the Sharp GH0631IA2G 638nm 185mW diode. The other two pens I have now are built with 462nm and 505nm diodes. The threads for those builds are here: 505nm Leadlight Pen Tutorial with 462nm diode One note...
  16. RA_pierce

    How to Build a Laser Pen - Featuring M462

    Recently I received a question regarding how I build my pens. I don't remember if I made a tutorial before so here's a new one. Materials and tools: Epoxy Super glue Sharp, strong scissors Toothpick (for epoxy application) Wire stripper Soldering iron & solder Scotch tape Patience Step 0...
  17. RA_pierce

    A Tale of Two Metrics

    A Tale of Two Metrics: Useful Parameters for Diode Comparison and the Need for High Quality Data It's typical to choose a diode for a build based on uniqueness of wavelength in our current collection or maximum output power. Another feature we might consider is beam characteristics. Those of us...
  18. RA_pierce

    Long time; no build: 505nm Leadlight

    Hey everyone. I came back here a few weeks ago to find a lot of exciting new developments. I had some spare parts left from the days I built lasers more frequently so I decided to put them to use with a few new parts. I built a chrome leadlight with the last x-boost super mini. I was kindly...
  19. RA_pierce

    Power Supply Recommendations

    Hi everyone. I'm looking into purchasing a DC power supply. Can anyone make any recommendations regarding what I should look for in a power supply? What are some useful features? How clean should the output be for laser diodes? Anything else to think about? I'd like to use it for testing...
  20. RA_pierce

    I haven't been here in a long time...

    Hey everyone. It's nice to see some familiar usernames. How is everyone doing? Have there been any new developments for the blue and green diodes lately? Post your builds if you wanna show off! I'd like to see some 520nm stuff or 470s if there are any. I've been busy with school, work, and...




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