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Old 10-02-2010, 04:32 AM   #1
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Default DIY: 1W Green? eBay

Saw this on eBay and im wondering how difficult it can be to build for only 100$ if it is efficient at all.

BIG GREEN LASER POINTER CAVITY DIODE OPTICS CRYSTAL KIT - eBay (item 170544504918 end time Oct-04-10 01:18:25 PDT)

Edit: does need a better 808 pump. It comes with a 500mw 808 pump. The seller claims the optics and crystals will handle 5W if needed.

Found these on ebay: http://cgi.ebay.com/5W-808nm-High-Po...item3f037816ea

Should be okay?
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Old 10-02-2010, 04:35 AM   #2
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Default Re: DIY: 1W Green? eBay

your not going to get 1W of green out of 1W 808 from what I've read in the past.
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Old 10-02-2010, 04:37 AM   #3
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Default Re: DIY: 1W Green? eBay

Quote:
Originally Posted by Pilgor View Post
your not going to get 1W of green out of 1W 808 from what I've read in the past.
No, but it states in the auction that the crystals can handle up to 5W of 808
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Old 10-02-2010, 06:05 AM   #4
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Default Re: DIY: 1W Green? eBay

Quote:
Originally Posted by jeffreythe00 View Post
No, but it states in the auction that the crystals can handle up to 5W of 808
Correction, 2W. The assembly can fit/handle up to 5W lasers, I guess:

Quote:
Originally Posted by aerodynamics2006
CRYSTAL WILL HANDLE UP TO 2 WATTS OF 808nm PUMP POWER AND OPTICS WILL HANDLE OVER 5 WATTS OF PUMP POWER IF REQUIRED.
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Old 10-03-2010, 03:08 AM   #5
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Default Re: DIY: 1W Green? eBay

Best case is you could get 600mW using a 2W pump. However he claims 80mW using 500mW pump.. so that's more like 300mW out of a 2W pump.

Still not bad for the price.. however i'd almost rather have separate crystals instead of a bonded pair. That way they could be heated/cooled independently for maximum efficiency.
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Old 10-05-2010, 02:36 AM   #6
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Default Re: DIY: 1W Green? eBay

The optics can handle over 5watts if required. Crystals only 2
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Old 10-05-2010, 01:03 PM   #7
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Default Re: DIY: 1W Green? eBay

thanks guys for clearing that up. I still don't think its a bad deal for anyone looking to make their own green especially if you wanted to swap out the crystals and the pump 8D
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Old 10-05-2010, 02:05 PM   #8
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Default Re: DIY: 1W Green? eBay

Don't forget that he says the 500mW 808nm supplied has
a Grin lens (FAC lens)... and if you buy a good 5Watt C-Mount
with FAC lens it will cost a bit more than what you linked to...
I believe the Laser you linked to does not have a Fast Axis
Correction lens...

Here is one that does...

5000mw 808nm laser diode with fast Axis Lens on eBay.ca (item 120627789930 end time 29-Oct-10 11:41:15 EDT)

BTW... as it is being sold... it would be a good way to learn
the ins and outs of a raw 532nm build...


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Old 10-05-2010, 02:57 PM   #9
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Default Re: DIY: 1W Green? eBay

You wont get 1W without lots of fine tuning and temp control. The DIY greens I've seen in the past topped out at around 50mW.
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Old 10-05-2010, 03:11 PM   #10
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Default Re: DIY: 1W Green? eBay

Quote:
Originally Posted by qumefox View Post
Best case is you could get 600mW using a 2W pump. However he claims 80mW using 500mW pump.. so that's more like 300mW out of a 2W pump.

Still not bad for the price.. however i'd almost rather have separate crystals instead of a bonded pair. That way they could be heated/cooled independently for maximum efficiency.

The efficiency of the crystals increases with pump power rather than staying the same and scaling linearly. This means that more pump power equals SIGNIFICANTLY more green output in a properly aligned cavity.
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Old 10-05-2010, 03:29 PM   #11
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Default Re: DIY: 1W Green? eBay

Quote:
Originally Posted by ElektroFreak View Post
The efficiency of the crystals increases with pump power rather than staying the same and scaling linearly. This means that more pump power equals SIGNIFICANTLY more green output in a properly aligned cavity.
Really? Learn something new every day. Is the increase in efficiency logarithmic or.. just not linear. heh.
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Old 10-06-2010, 01:02 AM   #12
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Default Re: DIY: 1W Green? eBay

It's non-linear to a degree, but I don't think it's as simple as saying it's logarithmic due to different heat and crystal-structure effects and the host of other things going on in there. While I can't quantify it myself, I know that pulsed lasers get very efficient doubling in a single pass from KTP because of the high peak powers generated.
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Old 10-06-2010, 01:22 AM   #13
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Default Re: DIY: 1W Green? eBay

So when it comes to the chineese cheeppys 532nm 5mw pointers, what is the I.R. pumping out to get 5mw green?
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Old 10-06-2010, 01:47 AM   #14
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Default Re: DIY: 1W Green? eBay

sometimes up to 200mW.
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Old 10-07-2010, 02:29 AM   #15
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Default Re: DIY: 1W Green? eBay

For the sheer awe of seeing a green laser beam that bright. I've been quite happy with my 50mW (half as bright as my >1W 445nm, perceptually) and I can't wait to get some higher power greens. I'm also delving a bit into the idea of building my own greenies, since I've got 2 cheap crystal sets from broken 5mW pointers, and I've got a 300mW pump diode on the way (may or may not work, I've read many of the ones sold on Ebay are out of spec with the wavelength, but it will be a learning experience).
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