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02-26-2017, 01:19 PM #1
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,209 Rep Power: 1092842
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Can anyone help identify the purpose of this 782nm laser diode?

I believe this 782 nm infrared water cooled laser diode might have been designed for pumping a laser rod, but for what wavelength the rod could produce when pumped with 782nm I have no idea. Will 782nm work with a ND:YAG rod? Anyone here recognize this? I cannot find anything on it either at the Coherent.com web site, or on the web.

PN:

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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

02-26-2017, 02:33 PM #2
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lasersbee
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Re: Can anyone help identify the purpose of this 782nm laser diode?

IDK.... I'd contact Coherent tomorrow.

Jerry
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02-26-2017, 02:44 PM #3
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Re: Can anyone help identify the purpose of this 782nm laser diode?

I seldom have any luck contacting the manufacturers for info on obsolete products, I can't find this in their products now. Perhaps I should try.
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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

02-26-2017, 02:48 PM #4
 Class 4 Laser Join Date: Sep 2008 Location: Quebec, Canada Posts: 16,845 Rep Power: 1028649
lasersbee
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Re: Can anyone help identify the purpose of this 782nm laser diode?

Just ask to talk to an Application Engineer/Technician.
A salesman only wants to sell you something. He doesn't
want to be bothered looking up info on a non-sale... IMO
You do have the PO # and date Shipped....

Jerry
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Last edited by lasersbee; 02-26-2017 at 02:49 PM.

02-26-2017, 06:53 PM #5
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,209 Rep Power: 1092842
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Re: Can anyone help identify the purpose of this 782nm laser diode?

I think it might be an old LIDAR diode, pulse, but don't have specs for it.

Edit: Checking the absorption wavelengths/lines to pump ND:YAG, 782nm isn't high enough, well, worse than that, no absorption peaks there at all, so I don't think it is for that rod, or for that matter, any other rod when searching the net.

780nm is great for low atmospheric attenuation, that's probably why that wavelength was used for early high power LIDAR, but the wavelength keeps moving in the commercial devices market, went to 850nm, now 905nm for a lot of rangefinding gear. However, 905 is crap for that due to relatively high attenuation. I'm talking long distances though, most commercial rangefinder users don't need that, golfers don't need to measure very far.
__________________

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; 02-26-2017 at 07:23 PM.

02-27-2017, 09:25 AM #6
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CurtisOliver
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Re: Can anyone help identify the purpose of this 782nm laser diode?

782nm has been known to be used to pump Tm:YAG rods. The emission produced is 2010nm and is know as a thulium laser. They are used mainly for medical applications. As you already said, 782nm is too low a central wavelength for ND:YAG. You could also theoretically produce a 391nm SHG.
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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

Which company should I buy from? By Sta

Wavelength to RGB Converter

02-27-2017, 09:48 AM #7
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,209 Rep Power: 1092842
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Re: Can anyone help identify the purpose of this 782nm laser diode?

The guy I bought this from just emailed me that it was to pump 2 um rods, that matches what you suggested too. On his ebay listing he suggested it could be used for pumping a rod, but I thought he was wrong.. Nope, I see he was right and I just needed to ask again for more specifics.

The case says burn in tested at greater than 8M, any idea on that whether referring to time or pulse energy? I might just contact coherent on this, just that I have had so many laser companies ignore politely worded questions about old stuff that I am now conditioned to assume they won't answer me. I think they are worried I might shoot myself in the eye or the stuff is just too old and they don't know, either way often silence. Maybe just because it isn't a sale and I need to do what Jerry suggested from now on.

Regarding this device, I don't want it for pumping a rod, but for other experiments, so that doesn't matter. However, I want to find the specs to know if I should pulse it at a max of 75 amps and if so, for how long, or whether that current rating is for CW. Being water cooled and the size it is, my guess is it is a long pulse rating and not CW, I think it is just too small for that, but then again, I am unfamiliar with water cooled diodes and what their ratings can be.
__________________

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 09:57 AM.

02-27-2017, 09:52 AM #8
 Class 3B Laser Join Date: Jun 2015 Location: Brentwood, England (Near London) Posts: 4,435 Rep Power: 1061818
CurtisOliver
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Re: Can anyone help identify the purpose of this 782nm laser diode?

At least I was correct on the application. >8M, I thought that was to do with lifetime, as in it will last 8 million shots but I could be totally wrong. I know, it is difficult to get a response from certain companies I have noticed.
__________________
Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
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

Which company should I buy from? By Sta

Wavelength to RGB Converter

Last edited by CurtisOliver; 02-27-2017 at 09:53 AM.

02-27-2017, 09:59 AM #9
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,209 Rep Power: 1092842
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Re: Can anyone help identify the purpose of this 782nm laser diode?

I was editing more into the post as you were typing an answer. I would think 8 million shots would use it up too much.
__________________

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

02-27-2017, 10:14 AM #10
 Class 3B Laser Join Date: Jun 2015 Location: Brentwood, England (Near London) Posts: 4,435 Rep Power: 1061818
CurtisOliver
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Re: Can anyone help identify the purpose of this 782nm laser diode?

The only way of getting exactly what you want is to find out from the manufacturer. These aren't that common AFAIK. I don't know if anyone on here has had any experience with these. All we know is what they are used for. You are probably right on the shots thing. It is possible that they are CW as it states power, not peak power or any mention of any duration. You would need sufficient water cooling for this laser it seems.
__________________
Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
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

Which company should I buy from? By Sta

Wavelength to RGB Converter

02-27-2017, 10:16 AM #11
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,209 Rep Power: 1092842
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Re: Can anyone help identify the purpose of this 782nm laser diode?

OK, I see what they probably meant now. Thanks.
__________________

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

02-27-2017, 10:18 AM #12
 Class 3B Laser Join Date: Jun 2015 Location: Brentwood, England (Near London) Posts: 4,435 Rep Power: 1061818
CurtisOliver
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Re: Can anyone help identify the purpose of this 782nm laser diode?

__________________
Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
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

Which company should I buy from? By Sta

Wavelength to RGB Converter

02-27-2017, 10:21 AM #13
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,209 Rep Power: 1092842
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Re: Can anyone help identify the purpose of this 782nm laser diode?

I'm thinking got to be a long pulsed device to pump a shorter pulsed output rod, I don't think a medical YAG would be used for anything but a pulse, certainly not going to weld anything together
__________________

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 10:23 AM.

02-27-2017, 10:26 AM #14
 Class 3B Laser Join Date: Jun 2015 Location: Brentwood, England (Near London) Posts: 4,435 Rep Power: 1061818
CurtisOliver
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Re: Can anyone help identify the purpose of this 782nm laser diode?

It is hard to say, I first thought pulsed as I saw articles about thuliums being used in ablation. But it doesn't seem to give any reference to pulsed for the diode you have. In that case, we have no idea about its peak pulse power, pulse duration etc. It would help the thermal management, by being pulsed. I'm going to take a look to see if I can find anything else for you.
__________________
Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
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

Which company should I buy from? By Sta

Wavelength to RGB Converter

Last edited by CurtisOliver; 02-27-2017 at 10:28 AM.

02-27-2017, 10:34 AM #15
 Super Moderator Join Date: Jan 2014 Location: Great White Frozen North Posts: 9,209 Rep Power: 1092842
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Re: Can anyone help identify the purpose of this 782nm laser diode?

He has more of them I might buy, that's why I'm trying to get the specs, or figure it out. Thanks, anything you find would be appreciated. I sure wasn't doing well with my earlier searches, couldn't find they were used to pump a rod.
__________________

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

02-27-2017, 10:36 AM #16
 Class 3B Laser Join Date: Jun 2015 Location: Brentwood, England (Near London) Posts: 4,435 Rep Power: 1061818
CurtisOliver
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Re: Can anyone help identify the purpose of this 782nm laser diode?

You're welcome, I'll at least give it a shot for you. I figured they probably was used to pump, so I looked that up first.
No description though seems to get any closer to the diode.
__________________
Notable products/sites:

Jet Lasers offers various high quality Diode/DPSS Portables in their PL-E Pro hosts. Jet Lasers are known for their quality and are respected on LPF.
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

Which company should I buy from? By Sta

Wavelength to RGB Converter

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