Kenom
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nah s-video is like this:
or
or
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FrozenGate by Avery
Power Meter Calibration and Comparison
- Thread starter pullbangdead
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Zom-B
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Hm now I see it, indeed. Strangely enough I do have a female specimen of the scientech plug, though I don't know where I got it even if you shoot me.
Kenom
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OK I got a cable and tested it and on lower powered lasers like less than 200mw it's roughly 20-50mw off. When I bump up to over 200mw then it climbs to almost 100mw off. Daguin, I'm hoping I can ship this to you and have you hook it to your meter and see what the results are. This way I can verify if the issue is the head or the meter. If it's the meter then I'll either have to get a new one or ship it back for recalibration which will cost me a TON! Hydro since you also have this same meter would you be willing as well to test it?
Ken
Ken
jayrob
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Hey hydro, did you get the lasers from scopeguy yet?
jay
jay
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^woot.
Great timing too. I'm using the testing set-up of one of my officemates, and tomorrow I'm putting together an 803T laser for this same officemate to use in his lab's photoluminescence test set up. So I'm building him a laser as a partial favor the same time I have to remind him he promised to do me a partial favor by letting me use his lab's meter.
Completely aside, but a great application of these lasers: I'm actually getting a lot of praise for making these things for the labs: 405nm, 100mW CW for hours, in a tiny package for less than $30, and it's a GREAT tool for what the labs around me are working on. For those that don't know this background, when making a gallium nitride device, LED or laser, the general technology now is an InGaAs "active region" (usually quantum well, but that doesn't matter for this discussion), surrounded by cladding layers and some other films to make the device function properly. So the active region ends up being a film sandwiched in the middle of everything else. One great to evaluate semiconductor materials is photoluminescence, hit the material with light and watch what color light gets fluoresced from the material, just like fluorescing things like everyone does for fun, but with a spectrometer to see the full resulting spectrum. The emitted spectrum can tell you a ton about defects and the structure of the material.
Well, with the gallium nitride devices we're making, aiming for the blue to green region of the spectrum, it is the general practice to use a 325 nm HeCd laser to fluoresce the samples. This is great for just a single film or the surface of a device. But, the 325nm light can't penetrate the cladding layers mentioned above, so basically there was no way to do photoluminescence of the middle of a diode structure, and no way to do it for the active region of the device (arguably the most important part of the whole thing). BUT, 405nm CAN penetrate, and infact goes straight through the whole thing. Thanks to these easily available, powerful, reliable 803Ts, for the first time, our labs are able to routinely and easily do photoluminescence on the entire diode structure, including all the way through the active region, at a fraction of the cost of any other solution. It's pretty awesome, and I'm getting mad brownie points for bringing these things along, as well as mad nerd points for being able to answer "oh yeah, I can just build the laser tonight, I've got my static-free soldering and work station set up all the time at home" when someone asks for one.
So yeah, I should be able to measure it soon, as long as there is no backlog of work in the lab. There's a big conference coming up soon for some of our people, but hopefully it won't be too bad.
Great timing too. I'm using the testing set-up of one of my officemates, and tomorrow I'm putting together an 803T laser for this same officemate to use in his lab's photoluminescence test set up. So I'm building him a laser as a partial favor the same time I have to remind him he promised to do me a partial favor by letting me use his lab's meter.
Completely aside, but a great application of these lasers: I'm actually getting a lot of praise for making these things for the labs: 405nm, 100mW CW for hours, in a tiny package for less than $30, and it's a GREAT tool for what the labs around me are working on. For those that don't know this background, when making a gallium nitride device, LED or laser, the general technology now is an InGaAs "active region" (usually quantum well, but that doesn't matter for this discussion), surrounded by cladding layers and some other films to make the device function properly. So the active region ends up being a film sandwiched in the middle of everything else. One great to evaluate semiconductor materials is photoluminescence, hit the material with light and watch what color light gets fluoresced from the material, just like fluorescing things like everyone does for fun, but with a spectrometer to see the full resulting spectrum. The emitted spectrum can tell you a ton about defects and the structure of the material.
Well, with the gallium nitride devices we're making, aiming for the blue to green region of the spectrum, it is the general practice to use a 325 nm HeCd laser to fluoresce the samples. This is great for just a single film or the surface of a device. But, the 325nm light can't penetrate the cladding layers mentioned above, so basically there was no way to do photoluminescence of the middle of a diode structure, and no way to do it for the active region of the device (arguably the most important part of the whole thing). BUT, 405nm CAN penetrate, and infact goes straight through the whole thing. Thanks to these easily available, powerful, reliable 803Ts, for the first time, our labs are able to routinely and easily do photoluminescence on the entire diode structure, including all the way through the active region, at a fraction of the cost of any other solution. It's pretty awesome, and I'm getting mad brownie points for bringing these things along, as well as mad nerd points for being able to answer "oh yeah, I can just build the laser tonight, I've got my static-free soldering and work station set up all the time at home" when someone asks for one.
So yeah, I should be able to measure it soon, as long as there is no backlog of work in the lab. There's a big conference coming up soon for some of our people, but hopefully it won't be too bad.
jayrob
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Cool! I'm after you pullbangdead... I sent you my address. It was quite some time ago though. Do you still have it?
Jay
Jay
Zom-B
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@pullbangdead
Doesn't it matter that these diodes are multimode?
Doesn't it matter that these diodes are multimode?
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im down to join in on this now that i finally got my meter 
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jayrob said:
::checks:: Yep, got it. No problem.
Zom-B said:
I think they're single mode....::confused now::. It's too early in the morning for any thinking for me, I've had 2 all-nighters this week. Either way, if the beam is good enough for optical storage/writing media, it's good enough for PL measurements.
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alright jay when you are done with it please let me know and we can do the exchange
jayrob
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Hey sk8, I personally don't mind if you join in on this testing, but this experiment has been a group effort that participants have contributed to from the beginning. Just a small contribution for the parts to build the two test lasers. I believe it was in the neighborhood of $10 bucks a piece.
Check this link to see a list of who is involved and the order of the route (there is a tab at the bottom - 'routing map'):
http://spreadsheets.google.com/ccc?key=pW49OuYfRMm7FXsb9trxWdQ&hl=en
There is a U.S. loop, and then they go over seas. The routing map was set up for the best order geographically. So, I think that maybe after the last one in the U.S. has tested the lasers, maybe you can get them before they go over seas. But I am not someone that can make this decision because it was a group effort.
Kenom built the test lasers, and they are supposed to return to him in the end. I'm sure, at the worst case scenario, you could test your meter after that. Check with Kenom though...
Jay
Check this link to see a list of who is involved and the order of the route (there is a tab at the bottom - 'routing map'):
http://spreadsheets.google.com/ccc?key=pW49OuYfRMm7FXsb9trxWdQ&hl=en
There is a U.S. loop, and then they go over seas. The routing map was set up for the best order geographically. So, I think that maybe after the last one in the U.S. has tested the lasers, maybe you can get them before they go over seas. But I am not someone that can make this decision because it was a group effort.
Kenom built the test lasers, and they are supposed to return to him in the end. I'm sure, at the worst case scenario, you could test your meter after that. Check with Kenom though...
Jay
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i dont have a problem at all putting money towards the cause.
who would be the best to ask? and thanks for that link!
who would be the best to ask? and thanks for that link!
jayrob
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Kenom built the test lasers but people have been waiting their turn... With that in mind, I would think that you might have to wait until they return to Kenom, and then ask him about sending them to you...
Jay
Jay
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that is honestly perfectly fine with me
i am in no hurry so i will just watch the thread and once its done with kenom ill be talking to him
i am in no hurry so i will just watch the thread and once its done with kenom ill be talking to him
Zom-B
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I'm in the Europe loop and I've been waiting for this to start rolling for three months already (that's how old this thread is). I also think it's not quite fair if he joins in midway, because we've paid the wage, split evenly. I'd like to think of this as at least as our ticket to get the lasers as planned, without interruptions from new people who join in later. Just my thoughts about this.
I've also got some news myself. I'll probably able to use the laser power meter and maybe even a spectrometer, at the University of Utrecht. So I'll be measuring them with two meters.
I've also got some news myself. I'll probably able to use the laser power meter and maybe even a spectrometer, at the University of Utrecht. So I'll be measuring them with two meters.