Old 09-23-2007, 03:39 AM #1
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Default How to make green laser from 808nm diode?

How to make green laser from 808nm diode?

I want to buy 808nm IR diode, probably 2W one. Now, I heard that you can make green laser out of it, but how is that done? A link to some guide or something like that would help me a lot.

And, how powerful would the green laser be from a 2W 808nm diode?


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Old 09-23-2007, 04:13 AM #2
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Default Re: How to make green laser from 808nm diode?

well first you have to get some special crystals and some lenses. then you have to put it together! the first part isn't as easy as it sounds though!
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Solid state laser materials are commonly made by doping a crystalline solid host with ions that provide the required energy states. For example, the first working laser was a ruby laser, made from ruby (chromium-doped corundum).

Neodymium is a common dopant in various solid state laser crystals, including yttrium orthovanadate (Nd:YVO4), yttrium lithium fluoride (Nd:YLF) and yttrium aluminium garnet (Nd:YAG). All these lasers can produce high powers in the infrared spectrum at 1064nm. They are used for cutting, welding and marking of metals and other materials, and also in spectroscopy and for pumping dye lasers. These lasers are also commonly frequency doubled, tripled or quadrupled to produce 532nm (green, visible), 355nm (UV) and 266nm (UV) light when those wavelengths are needed.

Ytterbium, holmium, thulium, and erbium are other common dopants in solid state lasers. Ytterbium is used in crystals such as Yb:YAG, Yb:KGW, Yb:KYW, Yb:SYS, Yb:BOYS, Yb:CaF2, typically operating around 1020-1050 nm.
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Old 09-23-2007, 04:15 AM #3
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Default Re: How to make green laser from 808nm diode?

Oh jeez... good luck. You'll need a series of things...



You'll need to get a KTP crystal, which stands for Potassium Titanium Phosphate. You'll also need a Nd:YVO4 (neodimium doped yttrium orthovanadate). Then you'll need a bunch of optics... just good luck lol.
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Old 09-23-2007, 04:15 AM #4
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Default Re: How to make green laser from 808nm diode?

hmmm it didn't quote?????? oh well, in other words, you have to get some of the special crystal in a green laser, that can cope with 2W being pumped into it. good luck!
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Old 09-23-2007, 04:15 AM #5
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Default Re: How to make green laser from 808nm diode?

great pic rasel!!! that will help alot!
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Old 09-23-2007, 04:16 AM #6
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Default Re: How to make green laser from 808nm diode?

although the TEC's are not really necessary with good heatsinking!
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Old 09-23-2007, 04:20 AM #7
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Default Re: How to make green laser from 808nm diode?

There are several configurations but in essence the output from the 808nm Diode is the input to Nd:YAG or better, Nd:YVO4 which then outputs 1064nm. The 1064nm is pushed thru a KTP crystal which resonates generating a harmonic output at 532nm green. The theory is easy but building an efficient 532nm DPSS from scratch is somewhat difficult. It's not impossible but each method (side pumping or end pumping) has it's own set of challenges. The devil is in these details since most 808nm diodes have a very wide divergence it needs to be controlled for end pumping. Side pumping lends itself better to bars and donuts. Too much energy focused at the wrong point and you can blitz the Nd:YAG or Nd:YVO4 rod or crystal although YVO4 is more tolerant of thermal stresses. Your interface points need to have specific AR coatings to block the final output of any IR wavelengths as well as prevent standing waves from reflections back into the OC side of any particular interface. You can get a very high order of efficiency with a properly designed and constructed DPSS. Twenty percent is quite common but homebuilt tend to be much less efficient. It's certainly worth it if you want to see if you can do it but if you want a powerhouse it could get expensive collecting the necessary parts that can fit and work together efficiently.
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Old 09-23-2007, 08:00 AM #8
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Default Re: How to make green laser from 808nm diode?

:-? :-? :-? :-? :-?
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Old 09-25-2007, 03:13 PM #9
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Default Re: How to make green laser from 808nm diode?

i think he wants to just get a dpss either built or just a dpss system with a input for a 808 bought.. where you mount the diode and you get a nice green out to focus/collimate
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Old 09-25-2007, 04:03 PM #10
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Default Re: How to make green laser from 808nm diode?

Well, I gotta warn you, I get the impression you're not quite sure what you're getting into. Its completely possible, and there's plenty of manufacturers that do it, but its not really accessible to the casual hobbyist.

The cost of buying a pre-built lab module ~500mW would be quite expensive (~$1-2k), but the cost of actually making your own 500mW green from a 2W diode will likely be thousands more, and much much work. It would be a very cool project and you'd learn a hell of a lot, but if you are on a budget with the goal of getting green laser, DIY is not the way to go.

Sorry for the bad news!
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Old 09-25-2007, 04:15 PM #11
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Default Re: How to make green laser from 808nm diode?

Love the graphic Rasel, I guess it would be a bit easier on a large scale (optical bench) rather than pointer sized. But even so that is a lot of alignment....... :-? I don't think I will be trying it soon .

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Old 10-03-2007, 07:56 PM #12
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Default Re: How to make green laser from 808nm diode?

http://www.laserpointerforums.com/fo...num=1190572337
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Old 10-31-2007, 01:01 AM #13
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Default Re: How to make green laser from 808nm diode?

Here is another pic on a green laser setup. I know its big, but I'm leaving it this size for the detail.
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