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Old 11-19-2010, 07:15 PM #17
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Default Re: 7mm long DIY 532nm laser TINY!

Quote:
Originally Posted by Blord View Post
If I don't know better, I would say you invented the green laser diode.

Such a small laser module would bring alot of new possibilities.
Not really... This is still considered DPSS.. A green laser diode would
not use an 808nm IR LD to pump a crystal set.. Besides, green LD's
do exist and are available at a high $$$ value. Last I read, they may become
available to the hobby community when their use increases in items
like laser pico projectors..

I would like to think of it as the worlds smallest DPSS though

I cant really call it that yet... I still have
to work in the optics and IR filter, but it will be much smaller
and hopefully more powerful than any other.


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Old 11-19-2010, 07:51 PM #18
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Default Re: 7mm long DIY 532nm laser TINY!

That's impressive.
I have been contemplating doing something similar for some time, since I have too many different bonded crystal sets from all sorts of cheap greenies.
Making an RGY pointer out of this is pretty clever.

Just yesterday, before I saw this thread, I was feeling proud of myself for getting 205mW peak, 175mW avg. out of a DIY greenie.
The module with optics is minimized to 30mm x 12mm (excluding driver), but this mini-Aixiz greenie is just too small!

What kind of divergence do you hope to get with such a small setup?
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Old 11-19-2010, 08:28 PM #19
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Default Re: 7mm long DIY 532nm laser TINY!

Quote:
Originally Posted by RA_pierce View Post
That's impressive.
I have been contemplating doing something similar for some time, since I have too many different bonded crystal sets from all sorts of cheap greenies.
Making an RGY pointer out of this is pretty clever.

Just yesterday, before I saw this thread, I was feeling proud of myself for getting 205mW peak, 175mW avg. out of a DIY greenie.
The module with optics is minimized to 30mm x 12mm (excluding driver), but this mini-Aixiz greenie is just too small!

What kind of divergence do you hope to get with such a small setup?
I would at least like to match the divergence of a red with some hand picked
optics on the reds..

The optics im using on the reds make for a similar profile to the average greenie..
I have tried a combination of optics on the greens in larger setups, but with
the space constraints, im looking to reduce the length and use possibly
an aixiz acrylic after the expander..

200mW out of a DIY, in a pen at that... Thats a excellent result in my books

You should post your 532nm builds, there just aren't enough 532 stuff
in the forum. Not 'ground up' builds anyways..
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Old 11-19-2010, 08:59 PM #20
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Default Re: 7mm long DIY 532nm laser TINY!

Quote:
Originally Posted by wannaburn View Post
I would at least like to match the divergence of a red with some hand picked
optics on the reds..

The optics im using on the reds make for a similar profile to the average greenie..
I have tried a combination of optics on the greens in larger setups, but with
the space constraints, im looking to reduce the length and use possibly
an aixiz acrylic after the expander..

200mW out of a DIY, in a pen at that... Thats a excellent result in my books

You should post your 532nm builds, there just aren't enough 532 stuff
in the forum. Not 'ground up' builds anyways..
I see.
Are you using a 650nm diode or 635nm?

I don't normally document all my projects, but I should.
This latest one was a spur of the moment thing. I had a CNI module with a bum diode and decided to dig through the junk box and get it working again.

Next time I put something together, I'll make sure to share it.
Maybe I'll take up the challenge and see if I can get a mini green running as well...
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Old 11-19-2010, 09:02 PM #21
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Default Re: 7mm long DIY 532nm laser TINY!

Quote:
Originally Posted by wannaburn View Post
I would like to think of it as the worlds smallest DPSS though...
Have you seen these?
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Old 11-19-2010, 09:33 PM #22
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Default Re: 7mm long DIY 532nm laser TINY!

Thats Really Nice , Great Work , Where did You get the bonded Crystals ?
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Old 11-20-2010, 01:03 AM #23
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Default Re: 7mm long DIY 532nm laser TINY!

Quote:
Originally Posted by RA_pierce View Post
I see.
Are you using a 650nm diode or 635nm?

I don't normally document all my projects, but I should.
This latest one was a spur of the moment thing. I had a CNI module with a bum diode and decided to dig through the junk box and get it working again.

Next time I put something together, I'll make sure to share it.
Maybe I'll take up the challenge and see if I can get a mini green running as well...
Im using 650nm as the only 635's I have are 7mw 5.6mm. I have a couple
of c-mount 635's but the beam requires far too much correction to fit
in a small handheld.


Whenever I start any project, I just snap some pics as I go. Some
pics I use in posts, other I just keep like a diary for my laser work..



Quote:
Originally Posted by Traveller View Post
Have you seen these?
Yesh those are pretty small, I might try a couple out.
I wonder how the optics are. Im still going for a shorter module
but those are ready made which is never a bad thing.

Quote:
Originally Posted by ionlaser555 View Post
Thats Really Nice , Great Work , Where did You get the bonded Crystals ?
The ones im using for trials are just random parts from China / DX pens..
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Last edited by JLSE; 11-20-2010 at 01:06 AM.
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Old 11-20-2010, 01:59 AM #24
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Default Re: 7mm long DIY 532nm laser TINY!

I've gotten a few 635nm diodes from 5mW pointers to do up to 13mW.
Pushing them any more kills them. A good one will put out 8-10mW with an uncoated acrylic lens.

At 8mW, they are about twice as bright as a 10mW 650nm pen I have.
However, I suspect that the wavelength shifts toward 640nm as the power is increased, as the color seems slightly less red-orange and more red compared to another diode at 5mW.

It would make it easier to match the color balance with higher brightness red.
Also, the 635nm diodes are case positive like the 808nm pumps - which may make configuring the batteries easier.
And... IIRC, the red/IR combo diodes are case positive as well. I'm not sure what power they are good for.
Just in case that info could be helpful for your project.
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Old 11-20-2010, 02:52 AM #25
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Default Re: 7mm long DIY 532nm laser TINY!

I cant remember what mix ratio I had played with before, but I have not even tried
a 635 for yellow. Now you've gone and planted a seed

Im curious to see what colour range can be had with the 635 and 532.
The only problem is I cant fit a red green combo into a pen. So having to stick
with slightly larger builds, I would also prefer 2-300mW of red for a nice
hot beam.

I will experiment with the 635, and if I like it enough over the 650,
it may be time to look at doing it with higher power 635's.

Its unfortunate that the higher power 635's are so costly
and a pain to deal with. Too bad DVD's are not written and read
with 635nm
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