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List - Existing Visible Wavelength Laser Diodes






Re: List of Visible Wavelength - Laser Diodes

rhd said:
I've actually been *semi* looking into getting a 622nm. To secure one in a 9mm package with a FAC lens is still an absurdly expensive endeavor. Like 80mW of yellow from CNI kind of expensive....

However, 150mW of 622nm is equivalent to over 1W of 660nm....
Beam: (622nm 150mw) vs. (660nm 1117.62mw)
...and it really truly IS orange ;)
Click to expand...

With a Ith of 750mA and operating temp of 5C, this diode is absolutely not suitable for portable use.
A TE cooled labby could work.
 
Re: List of Visible Wavelength - Laser Diodes

I know - I've been thinking of re-purposing a TEC, heatsink, and fans from a KasEO projector to make a labby - this would be it.

But a 589 is on my priority list before something crazy like this.
 
Re: List of Visible Wavelength - Laser Diodes

Added the 531nm (R) diode from Sumitomo that Coherent_Light mentioned in another thread.
 
Re: List of Visible Wavelength - Laser Diodes

I wasn't aware the projectors had any TEC's in them.
 
Re: List of Visible Wavelength - Laser Diodes

Just one - on the red LED emitter / heatsink. It looks fairly decent too.
 
Re: List of Visible Wavelength - Laser Diodes

Looks like you missed one thing:
Operating Temp. = 5°C ..... Operating Typical Current = 1250 mA ..... Divergence parallel = 7° ..... Divergence perpendicular = 50° (!)
Click to expand...

Althrough, a build with a TEC and a microcontroller would be the real challenge for a seasoned builder. (Being a hobbyist microcontroller developer, this is getting interesting even to me!)
 
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Re: List of Visible Wavelength - Laser Diodes

I question whether you would need a microcontroller. If the operating temperature is a MAX, then it might be possible to just driver the TEC to it's fullest. As long as that would keep the diode UNDER 5°C at all time, you might not need intelligence if 2°C was equally ok.

The other unknown is what happens at 10°C. Does it just increase in wavelength a bunch? Or does it fail permanently, etc.
 
Re: List of Visible Wavelength - Laser Diodes

Microcontrollers can get pretty small now - think QFN. I think one chip and minimal parts would be better than 50 passive components. Also - If the microcontroller was integrated into driver we could also dim the laser, have different modes and we could even connect it to PC and use a control program! Think sitting at your PC, laser mounted on the other side of room and you could turn it off and on, how sweet would that be?
 
Re: List of Visible Wavelength - Laser Diodes

Would be cool no doubt. Definitely not what I'm shooting for though :)
 
Re: List of Visible Wavelength - Laser Diodes

Imagine a computer program -- set mA or set PWM... OFF or ON etc. Woah. A photodiode pickoff lens so the program will even display current mW... Or even set diode temperature. The world's most deluxe laser ever. What diode should I put in... our favorite 635nm diode would look nice in it.

Gonna find an ATmega of choice... EDIT ATmega 32U4 is interesting and cheap but hard to get in QFN.

EDIT2: Found a Maxim document on how to use TEC's.
EDIT3: MAX8520 TEC driver... hmm!
 
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Re: List of Visible Wavelength - Laser Diodes

Hey guys,

There's a new 460nm laser diode that can do 100mW out there somewhere. It has been recently implemented in Toptica final products:
Toptica green diode laser offers CW and pulsed output up to 250 MHz - OptoIQ (news release) Toptica: iBeam smart (product page)
Side note - they've also got the new 515nm diodes on that page. Confirmation that these are in production and shipping, at least to industrial partners.

1) It would be nice to know who makes this 460. Any idea where this comes from?

2) Does anyone know whether InGaN diodes go up or down in wavelength with heat/current? IE, in terms of their given range, would you expect the wavelength to rise or fall with additional heat/current?

If it goes up in wavelength, then there's a chance this 460 might just be an over-driven Osram PL T4 NSB:
http://catalog.osram-os.com/jsp/dow...0.pdf&url=/media//_en/Graphics/00049856_0.pdf
I believe this is the diode that I'll find inside the ShowWX projector I'm going to harvest in a few weeks.

I've got diffraction gratings on their way so that I can compare the wavelength to a typical "445". From everything I've read though, I think this Osram tends to hit higher than a typical "445" by about 10nm. If that's the case, and I end up with a 455nm or 460nm diode out of the ShowWX, I'll create a new entry in the chart under the "(C) common OR cheap" category (since it will have effectively cost me half of $200. If that's not the case, we still need to figure out where Toptica is getting their 460nm diode from, so that I can add it in the "(E) exists but impractical or costly" category.

EDIT: I probably should have mentioned that they've also added a 420nm diode. It would be useful to figure out where that comes from also.
 
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Re: List of Visible Wavelength - Laser Diodes

I can't wait for the day that 488nm diodes are cheap and common - I'd love to be able to carry that beautiful blue-green classic argon wavelength around in a laser that I could fit in a pocket and hold in my hand! The only bad thing is that it will eventually drive argon lasers into extinction (or at least make them very, very rare, as it might take a while for the diodes to reach the high powers needed for some argon laser applications, such as surgery), but the upside is that you'll be able to carry that color around with you.
 
Update to OP:
Since 51?nm green laser diodes are now available, just astronomically priced, I've changed the letter from an "R" (for rumoured) to an "E" (for exists, but expensive)
 
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rhd said:
I thought this could be an interesting (and colorful) thread to keep updated. The idea is to track current diode laser wavelengths.

My proposed guidelines:
- Only visible wavelengths from 390 to 750, and only pure diodes, not DPSS.
- Cite sources unless it's a common wavelength
- Package type (9mm, 5.6mm, C-Mount, etc) isn't important, but something clearly outside the realm of portability doesn't count.
- If wavelength is given as a range, take the midpoint, and if that gives a .5, round up.
- Differentiate between (C) common OR cheap, (E) exists but impractical or costly, and (R) rumoured or anounced.
- If a particular wavelength has more than one entry, in different (C,E,R) letter categories, the most favorable letter will be indicated (C>E>R)

I'll give this a start:
375 nm - (C) - Nichia NDU1113E / NDU7216E
!
Click to expand...

Where is this commonly available?

Thanks!
 
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