Old 02-27-2017, 10:59 AM #17
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

It seems that it is possible for the laser of which it pumps to have a CW output according to a couple of references. There was reference in one article to the pump diode being QCW. The CW thulium was pumped by a 80W 782nm. So it seeming likely that the diode you have could be CW. These laser may be Q-switched for the medical applications?


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Old 02-27-2017, 11:02 AM #18
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

That's a lot of power then I like that. These were made so long ago hard to find info, Coherent here I come.
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Old 02-27-2017, 11:05 AM #19
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

If they are QCW/CW then yes, that is a lot of power. It is hard to find much on 782nm in general, let alone the diode that you want to get.

Edit: Just found this. All I keep coming across is 60/80W diode stacks, yours are 120W and do seem to be CW.
https://www.researchgate.net/publica...ctra_narrowing Click download full-text PDF.

You need to find out the operating voltage but they seem very similar to 808nm diodes. 2.2v per stack @ 75A? An 80W stack appears to have 6 diodes. If each is 2.2V then 13.2V is required. If we follow the same rule of thumb you can estimate that the 120W have around 9 diodes. 9 x 2.2V is 19.8V. 120W @ 19.8V/75A?
Let me know how far off I was when you get a reply from the manufacturer.
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Last edited by CurtisOliver; 02-27-2017 at 11:16 AM.
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Old 02-27-2017, 11:28 AM #20
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

Thanks, yes, that finding is great. Lemme see who I can reach at Coherent tomorrow. BTW: Here's a atmospheric transmittance graph for a range of near-IR.

ET can call home at 780 nm, for that matter low atmospheric attenuation at 808nm and 1064nm too. Each in the wavelength ranges we can find fairly high power surplus lasers.



Regarding the voltage, I had assumed they were all fed ~2.2 DC voltage in parallel, maybe not, but all of my 40-50W 808nm diode arrays are built that way.
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Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

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Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

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Old 02-27-2017, 11:34 AM #21
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

You're welcome. It was a mission to find anything particularly useful to be honest. I hope Coherent reply and fill in the missing pieces of information.
780nm is by far the best wavelength to use for that.
If later on in my lifetime we get ET contact, then it will all be down to you.
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Old 02-27-2017, 11:36 AM #22
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

I need pulse for high peak power, but then the average power is crap.... I have YAG's for high peak power, diode arrays for CW or QCW, but nothing long pulse between the two. The advantage of 782nm is an inexpensive camera can be used to see the beam, 808nm too, but at 1064, the cameras I can afford are not very sensitive there.

I can do SHG with 1064nm for high peak visible power, but then airplanes are a problem. Better I stay at IR for my experiments and only use vis laser light indoors with goggles on. Must be very careful with IR too, for that matter, but at least I won't be flash blinding anyone at a great distance. Although it's all about power density in each case. To expand, or not expand the beam, is the question. Expanding the beam and you can deliver more power density at a distance, but then if expanded enough, far less a hazard. That's why I am collecting large PCX lenses, up to 14 inches diameter for my biggest one. Most are 3, 4, 6 and up to 10 inch diameter for my experiments.
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Attention new brothers of the collimated light!

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Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

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Old 02-27-2017, 11:43 AM #23
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

You may be able to pulse these still, but I can't say with any certainty. Different papers gave different testing conditions. You need Diachi to pop by, he's good with pulsed lasers.
I reached the limit of how much I can find for you. Nothing else on that diode whatsoever.

Edit: I thought the diodes were run in series, that is why you can get diode power supplies 10V 70A for up to 5 diodes.
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Optotronics RPL 532nm DPSS Portables

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Last edited by CurtisOliver; 02-27-2017 at 11:47 AM.
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Old 02-27-2017, 11:51 AM #24
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

All of my high power 808nm FAP arrays are 2 volt, a bit higher up to 2.2 for some. The bars they use are all fed DC in parallel.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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Old 02-27-2017, 11:55 AM #25
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

Ok, so the stacks are parallel. I was getting confused with multiple diodes rather than stacks. Well in that case who are probably looking at similar specs, 2.2V @ 75A.
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Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
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For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
Eagle Pair Safety Goggles

For more sites and information please check out this thread.
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Old 02-27-2017, 12:05 PM #26
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

At roughly 45-50% efficiency, 2 VDC X 75 amps could produce the 120 watt output rating. Edit: Either the voltage or efficiency, or both, must be less for 120 watts out if rated for that power at 75A.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

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Old 02-27-2017, 12:21 PM #27
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

After doing the calculations I can see that something isn't quite right. 2V x 75A = 150W. 150/80%=120W. At that rating the laser would have to have a electrical to optical efficiency of 80%. At 2.2V x 75A the laser would have an efficiency of ~73%.
2.2V x 65A is what my 50W 808 needs. 2.2V x 65A = 143W. That is roughly 35% efficient which sounds about right. For 120W we would need ~343W. 343W/75A=4.57V.
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Old 02-27-2017, 12:22 PM #28
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

Voltage must be different, or efficiency much lower than I think.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

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Old 02-27-2017, 12:23 PM #29
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

Yes, it is both. The efficiency is around 35% and voltage must be much higher.
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If you are after an RGB module, you can't go wrong with Optlasers. Their 400mW model is very high quality.
Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
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For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
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Old 02-27-2017, 12:33 PM #30
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

That tracks, I remembered the efficiency of my FAP800 high power laser modules incorrectly, only 35%. 2 to 2.2 VDC, depending upon the module power output rating.
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Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3
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Old 02-27-2017, 12:37 PM #31
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

Yep. It is possible that 782's could be more efficient as not much is know about them, but we should presume the opposite. Lets say 25-30% as 808 is pretty well developed. This could put the voltage anywhere in between 5-7V. This is why you need to find this out from Coherent. It is all guess work from now on.
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Notable products/sites:

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Jetlasers PLE Pro's

If you are after an RGB module, you can't go wrong with Optlasers. Their 400mW model is very high quality.
Optlasers RGB Modules

Optotronics offers some of the highest output DPSS Portable Greens on the market. Their 1.4W RPL-II is by far their most amazing product and is known to be overspec.
Optotronics RPL 532nm DPSS Portables

Dragon Lasers offers the best option for 589nm (Yellow) Laser pointers.
Dragon Lasers Yellow Laser Pointers

Sanwu are known to be very high quality and every newcomer should check them out.
Sanwu Home

Bang good is a good source for many electrical items and are often cheap and reliable.
Bang Good Home

For reliable safety goggles visit Survival Laser. Use LPF445 for a 10% member discount.
Eagle Pair Safety Goggles

For more sites and information please check out this thread.
Which company should I buy from? By Sta






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Old 02-27-2017, 02:29 PM #32
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Default Re: Can anyone help identify the purpose of this 782nm laser diode?

Here's a somewhat similar Coherent product, except for 808nm:

Web page: https://www.coherent.com/lasers/lase...e-laser-arrays



Two-bar through five-bar horizontal linear arrays designed specifically to provide the highest reliability and lifetime in high-cavity-power, side- pumping applications. Coherent’s industry-leading, front-end technology, including our unique AAA material systems, combine with rugged PulseLife technology to produce reliability of >20k hours for most products. CW diode laser arrays employ electrically-isolated macro-channels, enabling tap-water cooling.

QCW arrays are conduction-cooled and require no water cooling. Standard horizontal arrays are available at 808 nm, in 2-bar through 5-bar configurations. Custom configurations and additional wavelengths are available on a case by case basis.

Data sheet: https://cohrcdn.azureedge.net/assets...Data-Sheet.pdf

__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 02-27-2017 at 02:56 PM.
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