pencil lead thin 445nm beam-no prisms no cylinderical lens

[shrad]

what you showed is a full telescopic system, so maybe there was some misunderstanding

[mccarrot]

The statement you are trying to make about how a telescope works is already known by 95% of the visitors on this forum and explained here many many times.

Peace and allot of Respect

You lost it here, sorry.

24W of blue and a scope would be on my list of things to do.

What takes most people a year to learn usually takes me 1 month....

[edison]

Hehe funny how the truth is always catching up

[Zoof]

Attachment 18284I got some 2x beam expaders and placed one after the glass collimator of my 445nm diode. My beam is now focusable to a fine dot in my room and up to about 30 feet away. You loose some of the beam off the scanner but when you got 1 watt and only need 500mw this is a clean straight forward way to correct the beam. The beam now matches my red open can diodes perfectly. You can even dial it in to be larger or smaller. Just thought I'd share the effort. You can buy the expanders from www.meshtel.com for $50.00. I glued it to the colimator adjustment ring. PS works for dpss lasers as well.

I added a picture. This was at about 20 feet from the projector. I had to run really low power to take the picture.

Kecked,
I'm just curious what is the beam size when it exits the telescope?
and if you know, what is the magnification of the telescope?
I'm guessing you have the 10x one and a rather large exit aperture.

[Xer0]

Then I realized I had a red Axixz lens.(they look blue).They eat easily half of 445

Sorry for OT, but which lens exactly is that; where to get?
For my low-power Pointer i need everything that looses power...

[CrazyMonkey]

Sorry for OT, but which lens exactly is that; where to get?
For my low-power Pointer i need everything that looses power...

The same company makes one AR coated for 405-445 as well.
Other lenses can give more power though, as these are 3 element.
http://aixiz.com/store/product_info....roducts_id=140
(you would have to email them to see if it's the 405-445)
here is a thread about it:
http://www.photonlexicon.com/forums/...ad.php?t=11675

There are other lenses like lens27, but I haven't used them,
so I can't comment on those.

[Xer0]

naaaah, i need the one red-coated you had, because i WANT to loose power!

[drlava]

Here is the red lens with diode mounting cylinder:

CLICK

Note that even the blu-ray aixiz lenses loose at least 25% of the diode power, but the red lenses loose more.

[kecked]

sorry I was away.

The beam is a little smaller than the size of a pencil when it comes out of the telescope. The expander is 2x. I actually did this just for fun. I was suprised that it worked. I also loose a ton of power doing it. I bet some of the beam is clipped in the telescope.

PS: I dropped the 660nm diodes and went 642nm. Much nicer colors and much brighter. Will be interesting to see what my quad does when loaded with 4 150mw 642nm diodes. I might need that blue power back!

I did as suggested try the beam at about 120 feet that is about as far as I can go. Its about 1 inch wide by 5-6 inches long. Still works for beam shows ok. As I said for my use in my house my solution works for me. I'm just sharing. Do what you will with it.

[drlava]

I did as suggested try the beam at about 120 feet that is about as far as I can go. Its about 1 inch wide by 5-6 inches long. Still works for beam shows ok. As I said for my use in my house my solution works for me. I'm just sharing. Do what you will with it.

With that measurement, the beam has about 3.74mrad divergence. You could probably get it close to 1mrad if you re-adjusted the system for far field focus instead of focus at 20 feet. But, you are clipping at the first lens, and again at the expander so losses are nearing 50%.