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ArcticMyst Security by Avery

Multiple diodes and one lens? Is it possible?

Joined
Aug 18, 2009
Messages
202
Points
28
Would it be possible to de-can two 445 diodes and line up the emitters to make one long one and have one lens to collimate them into one beam? Or does the light even come out at that angle? :thinking:
 





Joined
Jun 4, 2011
Messages
137
Points
28
Nope.


In order to colimate, light must come from a single point source at the focus of the lens. No way to get two diodes to emit from the same point.....
 
Joined
Apr 26, 2010
Messages
4,175
Points
83
Nope.


In order to colimate, light must come from a single point source at the focus of the lens. No way to get two diodes to emit from the same point.....

That may be true, but have you looked into PBS cubes?
 
Joined
Apr 21, 2012
Messages
57
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0
That may be true, but have you looked into PBS cubes?

PBS cubes combine. They don't collimate.

You send two beams (one of which has their polarisation rotated by 90 degrees with respect to the other) through a cube. You then get one unpolarised beam out.

If you put an uncollimated beam through a PBS you'll just get an uncollimated beam out.

And collimating after a PBS is a lot harder than collimating before.

Also, re: OP

Two diodes one lens.
 
Joined
Aug 18, 2009
Messages
202
Points
28
Is the light emitted from a bare diode directional? Or does it scatter in all directions?
 
Joined
Aug 18, 2009
Messages
202
Points
28
I've attached a pic to better ask my question. Is light emitted from only where the green arrow is, or the red arrows too? Thanks in advance BTW. :beer:
 

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Joined
Apr 26, 2010
Messages
4,175
Points
83
PBS cubes combine. They don't collimate.

You send two beams (one of which has their polarisation rotated by 90 degrees with respect to the other) through a cube. You then get one unpolarised beam out.

If you put an uncollimated beam through a PBS you'll just get an uncollimated beam out.

And collimating after a PBS is a lot harder than collimating before.

Also, re: OP

Two diodes one lens.

I understand that the OP wanted a lens, I was simply providing an option OTHER than a lens, that would work. I know how PBS cubes work, I told the OP to look into them and learn about them.
 




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