collimation of the 445nm diode?
collimation of the 445nm diode?
After seeing the output beam from the 445nm diode, I wonder how it could be collimated. It looks like the beam is elongated by a factor of about 8 or more. I have done this with a dpss beam that was elongated by a factor of about 3 or 4, with two cylindrical lenses in a good Melles Griot mount which was designed for the purpose (I got this as a freebie when I bought a Melles Griot blue dpss laser). The options seem to be either cylindrical lenses or anamorphic prisms. My guess is that the cylindrical lenses are a better choice, if someone has an appropriate mounting device for them. If not, then anamorphic prisms might be easier (?). But I've never used them.
collimation of the 445nm diode?
Hi Joe
Take a look here...
http://www.photonlexicon.com/forums/for ... y.php?f=51
There are plenty of folks there who are trying to tame the beam(s) from these diodes.
Cheers
Jem
Take a look here...
http://www.photonlexicon.com/forums/for ... y.php?f=51
There are plenty of folks there who are trying to tame the beam(s) from these diodes.
Cheers
Jem
collimation of the 445nm diode?
Thanks, Jem, I definitely want to follow those discussions. It looks like they are quickly making good progress.
collimation of the 445nm diode?
Yep, there are some clever folks over on PL i'm sure they will have an elegant solution shortly
collimation of the 445nm diode?
yes i too have been watching these guys
when i get up the nerve to hack into this nice piece of equipment(casio projector), i plan on trying the B&W optical train to see what happens, its two collimating lenses sit on either side of the prisim pair .................
when i get up the nerve to hack into this nice piece of equipment(casio projector), i plan on trying the B&W optical train to see what happens, its two collimating lenses sit on either side of the prisim pair .................
- Attachments
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- 473nm B&W laser optical train
- CIMG6670.JPG (236.04 KiB) Viewed 2328 times
collimation of the 445nm diode?
I think the prisms are easier to use. In fact I was pondering about a group buy for such prisms, which are usually quite expensive, and got a good offer for this. But I am not so keen getting into the kind of trouble dealing with this, and at any rate I first like to make some more detailed (simulated and hardware) tests to see what precisely is needed. One of the points is to get as much light through a spatial filter; the problem being that the beam can never be focused on an area that would be smaller than the aperture of the diode. I guess the problem is similar to coupling a diode to a fiber and it seems that the efficiency is typically low.Joe Farina wrote:The options seem to be either cylindrical lenses or anamorphic prisms. My guess is that the cylindrical lenses are a better choice, if someone has an appropriate mounting device for them. If not, then anamorphic prisms might be easier (?). But I've never used them.
I believe that the the width-to-length ratios apparent in the pictures in these forums are somewhat mislaeading, and that a magnification ratio of like 4 is appropriate; but let's see!
-Wolfgang