Old 02-13-2018, 07:12 PM #81
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Default Re: Super small YAG laser cavity

Quote:
Originally Posted by Alaskan View Post
Why not put a whole link? That number won't work.
A link would be more convenient, but you can just put the listing number into eBay search.


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Old 02-13-2018, 07:14 PM #82
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Default Re: Super small YAG laser cavity

That’s why I asked, didn’t work for me, now it is. Strange, I can cut and paste the item number out of one browser, then it appears to paste correctly into another browser for an ebay search, but ebay doesn’t recognise it. Does the same thing on my iphone too.

https://m.ebay.com/itm/Nd-Yag-Laser-...m/253424424226
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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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

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

Last edited by Alaskan; 02-13-2018 at 11:35 PM.
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Old 02-14-2018, 03:39 AM #83
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Default Re: Super small YAG laser cavity

Sorry I forgot to post earlier before work, but anyway sorry about not giving the link, I use the eBay app on my phone and canít get links just numbers. That crystal already sold but he has more in better condition, worth a shot? Or not?
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Old 02-14-2018, 03:49 AM #84
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Default Re: Super small YAG laser cavity

Depends on what you want to make with it, those come out of a Lumenis Novus Varia eye surgery laser, they aren't high power, maybe three to four watts or so output, perhaps more. You could put a KTP crystal in front of it and get 1 to 1.5 watts of green, depending upon how much power the 1064 YAG puts out and crystal efficiency, but the temperature must be carefully controlled for both the diode bar driving the YAG as well as the non-linear crystal/KTP.

This kind of project is likely to disappoint, unless you can get the mirrors designed for the YAG and crystal. I have two complete tri-color Novus Varia lasers, one I bought from this same seller, so I have the parts to do so, someday.... I HOPE. I bought them for the 561 nm parts. i had asked this seller to contact me when he lists more parts for those units, he forgot.

Here's a photo of the unit i bought from him showing that 1064 nm 2 x 2 x 12 mm YAG mount, plus my mark ups identifying the parts and how it works:

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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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

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

Last edited by Alaskan; 02-14-2018 at 05:33 AM. Reason: added photo
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Old 02-14-2018, 11:48 AM #85
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Default Re: Super small YAG laser cavity

Alright sounds like a project for another day thatís a super interesting laser though
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Old 02-15-2018, 01:52 AM #86
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Default Re: Super small YAG laser cavity

I asked that seller if he would let me know if he lists more of those, but he said you had spoken up for them. I thought you were too poor!
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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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-15-2018, 02:34 AM #87
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Default Re: Super small YAG laser cavity

I only asked how many more he had/how much they are never said I was going to get one, although I really want one I still canít afford it lol
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Old 02-15-2018, 03:06 AM #88
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Default Re: Super small YAG laser cavity

I don’t need one, but I’d like more, might not tear apart one of mt RGY units then.
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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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-15-2018, 03:39 AM #89
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Default Re: Super small YAG laser cavity

Well if you want to Alaskan you can have the ones I wanted, I probably wouldnít be able to use them anyway because I donít have anything to control temperature and align mirrors etc. but one day if I come lookin for one Iíll be sure to ask if you want to sell one
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Old 02-15-2018, 03:43 AM #90
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Default Re: Super small YAG laser cavity

Your decision, don't step out of the way for me, you contacted him first.
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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: - https://laserpointerforums.com/f37


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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-15-2018, 03:50 AM #91
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Default Re: Super small YAG laser cavity

Are they even possible to pump with say a 3 watt hhl package diode to get a few hundred millieatts out of? If you havenít seen one just type in HHL laser diode package on google. Itís basically a c mount diode in a housing with built in TEC. Would that be possible? Or does it need those 20-30 watt coherent diodes that need huge heat sinks and stuff?
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Old 02-15-2018, 04:51 AM #92
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Default Re: Super small YAG laser cavity

It was used with a 20 watt diode array in the Novus Varia, I don't know how little drive would be needed to do that.
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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: - https://laserpointerforums.com/f37


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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-15-2018, 10:43 AM #93
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Default Re: Super small YAG laser cavity

Well main question is I wonder if it has to be as long as the bar to pump it? Or can it be concentrated in one area to get light out of it still? You might not know and thatís okay but thatís what is keeping me from saying yes or no that I want to get it
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Old 02-15-2018, 02:33 PM #94
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Default Re: Super small YAG laser cavity

They are designed to be side pumped with a full bar to have much efficiency, that's why the crystal is 12 mm long, matches the width of a array bar.
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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: - https://laserpointerforums.com/f37


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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3
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Old 02-16-2018, 12:49 AM #95
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Default Re: Super small YAG laser cavity

Alright thanks for explaining Chris I aprreciate it. You can take the crystals if you want them, I won’t ever get to a machine shop to make heatsinks and other things so might as well not get them. They are all yours my friend also I’ve got a question for anyone that can answer it. The c-mount laser diodes have a very small cube of white ceramic material right under the long flat cathode, is that just normal ceramic or is it BeO? If it is BeO I’m not going to touch it in fear I will die
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Last edited by Branson33; 02-16-2018 at 12:50 AM.
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Old 02-16-2018, 01:02 AM #96
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Default Re: Super small YAG laser cavity

Thanks, he might want too much for them, that last one sold cheap because the crystal had a flaw.

That might be BEO, but I just don't know, that stuff is safe in that form unless you grind it into a powder and breath it in etc.
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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: - https://laserpointerforums.com/f37


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 Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

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