445nm beam profile

dannybee · Post by **dannybee** » Tue Feb 01, 2011 8:45 pm

this is my wwork on 445nm beam profile

dannybee · Post by **dannybee** » Tue Feb 01, 2011 8:54 pm

Beam optics

dannybee · Post by **dannybee** » Tue Feb 01, 2011 8:58 pm

Beam spread by fiber optic lens http://www.surplusshed.com/pages/item/l3172.html

dannybee · Post by **dannybee** » Tue Feb 01, 2011 9:01 pm

clean spread of beam,

dannybee · Post by **dannybee** » Tue Feb 01, 2011 9:02 pm

photo of hologram coming soon, was able to do nice clean trans hologram ... need to make it a bit brighter for show

dannybee · Post by **dannybee** » Wed Feb 02, 2011 12:02 am

for information... this is a Dave Battin laser , Te cooling, run at 135mw with good coherence

Joe Farina · Post by **Joe Farina** » Wed Feb 02, 2011 7:30 am

135mW (with reasonable coherence) is an impressive amount of power with TE cooling only and no extended cavity. Was there any kind of feedback to the diode (microscope cover slip, etc.)?

I looked at the fiber optic face plate from Surplus Shed. That's pretty wild, I've never seen those before. It appears from your photos that you're using a single cylindrical lens first, then the beam goes through the face plate. The spread beam looks very nice and clean.

dannybee · Post by **dannybee** » Wed Feb 02, 2011 10:53 am

Joe Farina wrote:135mW (with reasonable coherence) is an impressive amount of power with TE cooling only and no extended cavity. Was there any kind of feedback to the diode (microscope cover slip, etc.)?

I looked at the fiber optic face plate from Surplus Shed. That's pretty wild, I've never seen those before. It appears from your photos that you're using a single cylindrical lens first, then the beam goes through the face plate. The spread beam looks very nice and clean.

feedback to the diode ? how do you do that? and will that alow me to turn up the power? can you use a beam splitter to throw back lets say 25% ? need more input? we are doing this resurch to get more of this units on the market

and give all of us cheap blue photons

Joe Farina · Post by **Joe Farina** » Wed Feb 02, 2011 11:06 am

If there's 135mW already, with enough coherence, without feedback, then I'm not sure if there's much of a need to look into the simple feedback technique (See the thread in the OLD forum, in General Holography, on the first page, called "Some experiments with the blue LD's," by Thieu). There is some more information and tests on Wler's pages.