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Old 04-23-2012, 09:11 PM #1
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Default Multiple diodes and one lens? Is it possible?

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?


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Old 04-24-2012, 02:30 AM #2
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Default Re: Multiple diodes and one lens? Is it possible?

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.....
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Old 04-24-2012, 04:01 AM #3
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Default Re: Multiple diodes and one lens? Is it possible?

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Originally Posted by Jubathoph View Post
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?
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Old 04-24-2012, 06:50 AM #4
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Default Re: Multiple diodes and one lens? Is it possible?

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Originally Posted by bloompyle View Post
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.
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Old 04-24-2012, 02:45 PM #5
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Default Re: Multiple diodes and one lens? Is it possible?

Is the light emitted from a bare diode directional? Or does it scatter in all directions?
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Old 04-24-2012, 02:55 PM #6
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Default Re: Multiple diodes and one lens? Is it possible?

It scatters in all directions.
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Old 04-24-2012, 03:34 PM #7
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Default Re: Multiple diodes and one lens? Is it possible?

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.
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Multiple diodes and one lens? Is it possible?-untitled.jpg  
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Old 04-24-2012, 03:58 PM #8
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Default Re: Multiple diodes and one lens? Is it possible?

Green arrow
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Old 04-24-2012, 04:08 PM #9
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Default Re: Multiple diodes and one lens? Is it possible?

Quote:
Originally Posted by Oceansoul View Post
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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405nm 500mW
442nm 15mW Melles Griot HeCd
445nm 1W
455nm 100mW LaserBTB
457nm Tunable OMNI 532
465nm Tunable OMNI 532
467nm 1.8W NDB7675
472nm Tunable Omni 532
473nm 2x 100mW Melles Griot lab heads w/ PSUs
476nm Tunable OMNI 532
488nm Single line 35mW
496nm Tunable OMNI 532
502nm Tunable OMNI 532
514nm Tunable OMNI 532
520nm 40mW MSV2
532nm Various pointers
543nm GreeNe 2mW
568nm ~20mW ArKr whitelight line
589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
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650nm Raman 6 line
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Old 04-24-2012, 04:23 PM #10
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Default Re: Multiple diodes and one lens? Is it possible?

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Originally Posted by Jubathoph View Post
Green arrow
Crap. Thanks. And thanks bloompyle.
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