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I've used lasers to try reflow soldering. Not ideal, but might have a purpose where normal reflow/soldering can't be used. I'll throw in a cool experiment idea. You can use a higher power single mode laser, I've used my~200mW ML101U29, to make perform optical trapping/levitation/optical...

I'd be doubtful it would work. Controlling that many beams to get a good focus would be very difficult. Since you'd be using CW pumping I would think you'd need to use pump/flowing dye. Did you see this thread yet...

The link that CynicalBrad posted from lambdawave gives a decent color representation by wavelength. Use that tool to get a colorr approximation. For myself, the transition from blue to green happens around 495nm-500nm. At 488nm it looks like a very light blue with no green to my eyes. At 505nm...

520nm diode lasers would not have any issues with lower temperature instabilities. Does the laser power need to be adjustable in the field or just once? I would suspect that pot-modding it should be OK, but without knowing the circuit it is hard to know for sure. Putting a polarizing filter in...

Quite the original intro, Stupid. :) I think you are correct in the annoyance of some people to rudimentary questions, and not searching it first. I also think it might be an issue with uninformed posters not accepting criticism or suggestions. Most simpler topics have already been discussed...

What gazer101 said. The BDR-209 is like many 405nm diodes and tends to be quite sensitive and not very robust, so it is best to under drive it. Even run modestly, with 600mW out, it is still a significant eye hazard. This could be mitigated by defocussing it and/or by wearing safety glasses.

What UV flashlight are you currently using? If it is a cheap one it may be part of the problem. 365nm LED flashlights at 3W can be had relatively low cost (aprox. $30.). For a laser, the best diode would be the BDR-209 (single mode/better beam quality) or GH04W10A2GC (multimode/worse beam...

Are you looking for a specific type of keyswitch or just any general good quality type? Something else to consider, does it matter if the key can be removed in either position or only in off. For a laser projector I built I had to use one that could only be removed in the off positions, but they...

Welcome aboard. Laser science has certainly progressed a lot since the 80's. The majority of stuff here at LPF is with diode lasers, however there are still a bunch of people interested in the other laser types. Given your professional introduction to lasers I assume you were introduced to the...

Very nice project. I am curious how you implemented the PWM variable brightness function. You say you are using filtered pwm to get an adjustable analog voltage, but how is that voltage controller the LD current. What buck IC are you using? For PWM are you using the normal 490Hz or 980Hz or a...

To start with, make sure you understand the dangers with lasers and how to use them safely. There is a lot of information on this forum that can be found by using the search bar also, so don't forget that resource. I would agree with your decision to start with lower power first. If you want a...

No idea. I got it from another member here, mariomaster, I doubt he ran it hard. In the 4 years I've had it I've only put 80 hours on it. I try to run it once every few month to keep the pressure from getting too high. Which reminds me that I should pull it out and give it a run as I haven't...

I think mines got around 5660 hours on it now.

Very nice, alway great to see mixed gas lasers get some love. Is it an Omnichrome? Mine is very high hours so the 647nm only shows up on warm up.

I immediately thought of someone here who did a small higher power build a number of yeas ago. I think it was Benmw? or one of the veterans here. He made a li-po powered 445nm build with custom small housing, kinda zippo sized/style. The one problem with a light weight build is you are...

It is practically impossible/unpractical. A suitable laser would either be too expensive or take way too long to cut. And additionally there would be problems (safety and legally) with shining a laser into the sky. Just from a practically perspective, just keep cutting it with a chainsaw or...

That AMC7135 also come in a special version for 380mA. I think the AMC7135 is an obsolete part by now, so it might be hard to find.

I would think they would have a slight improvement in the visibility of the writing beam (lower "violet" brightness). There would be less brightness from the 375nm over 405nm. The fluorescence/phosphorescence would have the same brightness though. The 375nm would eliminate the violet from the...

The specifications give it at 1.5mW or 2mW at 632.8nm. Although the power can sometimes be higher than specified, but not by much (3-4mW max likely). http://repairfaq.cis.upenn.edu/sam/brochures/SP196L/index.html Does the laser work? Sam's laser FAQ is always the go to resource for HeNe info.

Even for 405nm, the only recent development is the Sharp GH04W10A2GC. Otherwise you have to get UV from excimer, tripled/quadrupled YAG, HeCd, etc.