Old 02-07-2018, 01:23 AM #1
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Default Super small YAG laser cavity

Hey guys, I recently got this tiny ND:YAG rod for free as a gift. I am wondering how the heck should I make a cavity for it? I have 20mm mirrors coming in the mail, but Iím not sure how Iím going to get it to work, Iíve been having the privalage of using rods with integrated mirrors, but Iíll need to find ways to perfectly mount the mirrors I guess, but back to the cavity, is anyone here good with making them? Please some tips would help. Thanks! I was thinking of using a camera flash lamp because they are the same size (super small!) pictures are below in the link and album titled Small YAG
https://ibb.co/cmOcFc


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Old 02-07-2018, 03:13 PM #2
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Default Re: Super small YAG laser cavity

The face of the rod shown in your picture looks pretty rough... Got a better picture?

As always, the FAQ is worth a read: https://www.repairfaq.org/sam/lasercps.htm
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Old 02-07-2018, 08:15 PM #3
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Default Re: Super small YAG laser cavity

Side or End pump with a 808nm diode

Last edited by jors; 02-07-2018 at 08:21 PM.
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Old 02-07-2018, 08:16 PM #4
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Default Re: Super small YAG laser cavity

Quote:
Originally Posted by jors View Post
Side pump with a 808nm diode

Or four, it's plenty long for that!

That'd be fun to build a pump chamber for...
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Old 02-07-2018, 10:18 PM #5
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Default Re: Super small YAG laser cavity

Hey guys, if I do side pump it with single diode, does it have to be focused? I have a 3 watt 808nm diode it’s in an HHL package it’s called SDL 2300 something. And also the rod has good ends those were just fingerprints, sorry
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Old 02-07-2018, 10:22 PM #6
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Default Re: Super small YAG laser cavity

Quote:
Originally Posted by Branson33 View Post
Hey guys, if I do side pump it with single diode, does it have to be focused? I have a 3 watt 808nm diode it’s in an HHL package it’s called SDL 2300 something. And also the rod has good ends those were just fingerprints, sorry

You want to pump that with a bar or four, at 20W each. There's more to it than that though. Much more.

Read. The. FAQ.

There's plenty of other websites out there with information too, not to mention threads on here, on Photonlexicon and on alt.lasers.

Also, BUY LASER GLASSES. If you're going to play around with high powered Nd:YAG (be it lamp pumped or diode pumped) you NEED appropriate glasses. At the very least you want OD5+ for 808+1064.

Last edited by diachi; 02-07-2018 at 10:25 PM.
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Old 02-08-2018, 02:00 AM #7
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Default Re: Super small YAG laser cavity

Yes, the design of the cavity, the placement of the pump diodes, the optics, temperature management and so much more is needed to make this a success. Sam's Laser FAQs is a great place to start. Another good reference is Walter Koechner's book, "Solid State Laser Engineering". Got a hardcover copy myself.
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Old 02-08-2018, 02:39 AM #8
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Default Re: Super small YAG laser cavity

Alright Iíll probably have to wait on that then and maybe just make a handheld YAG laser. If I can get the optics aligned that is. Thanks guys! Also I just got my ND:YVO4 + KTP crystal ordered, itís pretty large 5x5x3, so not to tiny like the old crystals that everyone used I forget the name something that starts with a D. Also a 6x6x5 KTP crystal that is huge. Should be fun and the first crystal stated is optically bonded, not glued.
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Old 02-08-2018, 02:59 AM #9
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Default Re: Super small YAG laser cavity

What are the units for your crystals? Inches, millimeters? You say large and then post numbers, but without units, they are meaningless.
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Old 02-08-2018, 03:19 AM #10
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Default Re: Super small YAG laser cavity

Sorry it is millimeters. They are still large compared to many other KTP crystals not all but bigger than most. If that was in centimeters or inches they would cost a legit crap ton lol
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Old 02-08-2018, 03:21 AM #11
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Default Re: Super small YAG laser cavity

I suspected it was mm. But, until you state it, one cannot know.
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Old 02-08-2018, 07:01 PM #12
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Default Re: Super small YAG laser cavity

If you want a project, you have one with that rod like that. I've seen people get rods working by simply wrapping aluminium foil around a rod and flash lamp together, but surely much less than optimal. Research elliptical cavities for rods, it's not a project I would want to take on, or driving them with bars for that matter. For myself, I would find a YAG already mounted in a cavity with flashlamp and mirrors already in place, that's enough work like that for me.
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Old 02-08-2018, 11:31 PM #13
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Default Re: Super small YAG laser cavity

Alright thanks Alaskan! I actually have a deal with a guy in Scotland named Caspar Clark he is the CEO of Helia photonics and he said he would coat the ends of my ruby rod from the m60 tank and the small YAG crystal for free if I paid shipping here and back (about 100 dollars give it take) so I think after that I might get a single 30-40 watt diode bar and line it up with the rod and see what happens. Also did you get my PM?
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Old 02-09-2018, 01:41 AM #14
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Default Re: Super small YAG laser cavity

hi, yea, i got your pm, i thought mirrored coatings on a rod like that would be big bucks to get done and you got it FREE! yes, i received your pm, what i was trying to tell you is the ssy-1 i got from you has the Q-switch already in it, that is why i'm perplexed why you said it was taken out and included an extra one in the package.

chris
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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

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

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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

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Old 02-09-2018, 02:15 AM #15
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Default Re: Super small YAG laser cavity

Might want to check again Alaskan...Iíve only owned 1 SSY in my life so it canít have 2 q-switches. Unless the laser fairy put one in there for you but really though I put the one in the little foam package and there isnít one already in the housing. Also I am very grateful there are people like that in this world. Originally the quote was 2000 USD to get one rod coated, but I told him I am a hobbyist and would love not using external mirrors. He was very nice about it and said he could help. So shortly Iíll be shipping them off to Scotland for coatings. Very awesome person!! And also just check once more for me Alaskan about q switch.
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Old 02-09-2018, 02:29 AM #16
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Default Re: Super small YAG laser cavity

ok, i don't know what the hell then, here's a photo showing one of these taken apart, with an arrow pointing towards the q-switch, that is there on the one i'm looking at. only explanation for this is i have looked at the wrong SSY-1, i have several, i will figure this out but i don't know how i could have gotten this wrong with keeping the one with the extra switch in a zip lock bag separate.

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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

Last edited by Alaskan; 02-09-2018 at 03:14 AM.
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cavity, diode, neodymium, optics, yag





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