Recent content by nmz787

thanks everyone, so far I got a lab bench power supply (mastech clone HY3005D, 0-30V 0-5A) and a 405nm SO6J from DTR's laser shop. I got sidetracked from the project so probably won't post here for a few weeks, but I'll update as things progress. My next goal is to measure the beam divergence...

aliexpress has 1000mW and 5000mW... are either real? 1000mw 405nm mini violet blue laser pointer/ focusable burning purple laser-in Laser Pointers from Office & School Supplies on Aliexpress.com 1000mw 405nm mini violet blue laser pointer/ focusable burning purple laser +light cigar,5pcs-in...

graind, thanks I didn't know a laser existed in that wavelength! What kind of Wattage can you get in that color?

Thanks, great info to have. With no experimental tests of 405nm and PDMS (Sylgard 184) I figure I want as high of radiance with best spot for now. I'm also interested in defocusing the target to increase the spot size, so I'll need power to get away with that.

For what purpose?

I guess I should man up and say that while it is the edge of the graph, it's heading down... this is the only spectrum I've found in 2 years for this compound though, so I'm not entirely convinced this is correct. I've marked right about where 830nm should be...

I don't think I missed anything. I also have a 1W 830nm laser but I don't know if it's single mode, and NIR optics are more expensive than VIS. I know the material has to absorb to get heated, unfortunately the only spectrum of the material (PDMS) I have cuts off just below 500nm, so the...

My buddy who helped with our openspectrometer.com project thought about using TOSlink as cheap spectrophotometer connections and probes and such. They are certainly the right price, and sure maybe not ideal for UV, but maybe "good enough" for a wide range of other purposes. They're almost cheap...

Thanks Jim. I need to cut silicone, not silicon... its an elastomer like RTV gaskget sealant, or bathroom caulking. It is clear, and I'd like it to stay clear (rather than mix in charcoal ash to blacken it), but luckily it's also very thin (0.1mm)! I've heard of the aixiz lens mounts, are there...

The blu-ray optics spec has the spot being close to diffraction limit, though the focus is about 0.6mm This is a great spot size, and its probably very near TEM00. Why don't I see anyone using the drive sled with manual control of the diode? Not removing the diode from the sled or anything...

any updates? this is pretty cool!

I wonder if the 12X 405nm laser diodes have the photodiode too. I've been looking at current controllers that use the photodiode to control max brightness, since the lasing mirrors can start to break down past a certain current

I know there are 14X bluray drives out now, are they higher power laser diodes than the 12X? Earlier I chatted with Edmund Optics online tech support for about 30 minutes... they said if the laser is elliptical (think 445nm bar lasers), these "anamorphic prism pairs" may help to correct it to...

So how did things end up? I need to cut ~2000mm/min in thin silicon ~0.1mm thick, so depth of field shouldn't matter too much. I want a spot size of <5 microns. The 445nm laser should be able to focus quite similarly to the 405nm laser, if you consider the diffraction limit being the...