Multiple diodes and one lens? Is it possible?

[crazyhobo]

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:

 

[Jubathoph]

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.....

 

[bloompyle]

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?

 

[Oceansoul]

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.

 

[crazyhobo]

Is the light emitted from a bare diode directional? Or does it scatter in all directions?

 

[Oceansoul]

It scatters in all directions.

 

[crazyhobo]

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:

 

[Jubathoph]

Green arrow

 

[bloompyle]

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.

 

[crazyhobo]

Green arrow

Crap. Thanks. And thanks bloompyle.