Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

building green DPSS

.3lite

.3lite

0
Joined
May 4, 2009
Messages
287
Points
18
Hey,

I'm actually building a green DPSS laser using a Chris diode from bag (that 25 diodes in 9mm).

Half of diodes were 960nm and the other half actually are 808nm, and one 655nm which was damaged : /

So, using some old crystals from my 532nm module, and 808nm decan'ed diode we can get nice green light.

I'm still waiting for glue to dry, but I can atleast give some pictures of work for now:

001.jpg

002.jpg

003.jpg

004.jpg

005.jpg


More pictures soon!
 





Asherz

Asherz

0
Joined
Jan 18, 2009
Messages
1,623
Points
0
That's pretty sweet! Nice work, I think I might get be a grab bag
 
E

ElektroFreak

0
Joined
Nov 7, 2008
Messages
5,725
Points
0
Not bad at all! The output looks to be TEM00, so that's very good. Can't wait to see some power measurements.
 
.3lite

.3lite

0
Joined
May 4, 2009
Messages
287
Points
18
Just nothing, if you want a serious green you just need put diode die (I don't know if it is called that, I mean the structure, that small thing lol xD) in front of crystals, no lenses, thats why 9mm need to be decan'ed (c-mounts are better)
 
E

ElektroFreak

0
Joined
Nov 7, 2008
Messages
5,725
Points
0
That's not entirely accurate. While it can be done that way, it's much better to use a lens to focus the beam so that its waist is just inside the vanadate crystal, not on it's surface. You get MUCH higher efficiency and output..
 
.3lite

.3lite

0
Joined
May 4, 2009
Messages
287
Points
18
I don't think so, I've talked to many people, and one green modules seller, they all claim that the best is as I've told.
 
E

ElektroFreak

0
Joined
Nov 7, 2008
Messages
5,725
Points
0
Hmmm. Sounds like you need to do a little more reading. While I just said you can do it that way, it's not the best method. But hey, it's not my job to teach you how to build a laser, just trying to give some constructive criticism. It sounds like you're the real expert, though.. Good luck with your build!
 
GooeyGus

GooeyGus

0
Joined
Mar 8, 2008
Messages
2,669
Points
48
If you want REAL power, you focus the output into the crystal. Putting the crystals right on the die gets a pretty small beam into the diode, but not as small as you could get with a lens in front. The goal is the get the most energy density into the crystal as possible.
 
.3lite

.3lite

0
Joined
May 4, 2009
Messages
287
Points
18
ElektroFreak said:
Hmmm. Sounds like you need to do a little more reading. While I just said you can do it that way, it's not the best method. But hey, it's not my job to teach you how to build a laser, just trying to give some constructive criticism. It sounds like you're the real expert, though.. Good luck with your build!
Click to expand...

Well, I though always that, because in past I couldn't get anything good from focused beam to crystals, but as you've said that, I think I was wrong.

I will give a try soon, thanks for that.

#up

Thanks aswell.


#project

It's getting hot ashell ;P Remember that crystals from pointers? In cylinder? After few seconds it gets hot and loss effecivity very quickly, I've got a peltier, I think I will give it a try to cold that DPSS.
 
Last edited:
GooeyGus

GooeyGus

0
Joined
Mar 8, 2008
Messages
2,669
Points
48
if you are using separate crystals, try cooling the Nd:YVO4 and heating the KTP.

Those are 'ideal' conditions.
 
.3lite

.3lite

0
Joined
May 4, 2009
Messages
287
Points
18
If only I had that small peltiers which are inside TO3 laser diodes ;/ I've got that 40mm*40mm so it can be used only to cool whole laser.
 
E

ElektroFreak

0
Joined
Nov 7, 2008
Messages
5,725
Points
0
Well, I though always that, because in past I couldn't get anything good from focused beam to crystals, but as you've said that, I think I was wrong.
Click to expand...

The reason you've not had good luck with this method is that focusing the pump beam also makes the alignment much more critical and touchy. It's kind of a trade off. If you want maximum efficiency, you'll have to spend a good amount of time aligning.

Also, you can still use that TEC.. Just mount the entire heatsink assembly to it. It will work just fine, probably just as well as mounting the diode directly to a TEC, as long as the metal-to-metal contact between the diode and the heatsink is sound.
 
Last edited:
You must log in or register to reply here.




Top