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Author Topic: LED > Fiber Optic  (Read 3441 times)

P47

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LED > Fiber Optic
« on: July 28, 2012, 09:38:26 AM »
I'm looking to pump light from an LED engine into "one" strand of fiber optic. If I hold it close, I get a pretty good amount of light at the other end, but I know I'm losing a lot of energy. Does anyone have, or know where I can get a small collimating or reducing lens so I can focus the led. The led I'm using is a star shaped 3W RGB led light engine. I ripped apart an old laser pointer to get the lens assembly, but it was made for one of those tiny square leds and didn't work well. My led is approx .22" round and the fiber is .03".

Any help would be appreciated.


Thanks,

P47
« Last Edit: July 28, 2012, 09:56:13 AM by P47 »

Simply7

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Re: LED > Fiber Optic
« Reply #1 on: July 30, 2012, 12:44:23 PM »
I did something like this once. I didnt use a lense though.  I drilled a hole in the led  right up to the emitter then used superglue to hold the fiber optic in place. The drilling roughs the led surface but the superglue filled in the roughed (scratched area of the lef) so that the optical clarity was not that bad.

This was for some lighting effects and not communication so depending on what you are doing this may not be the best option.

Skycraft has the small drill bits, but they are very fragile.

Good luck.

P47

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Re: LED > Fiber Optic
« Reply #2 on: July 30, 2012, 01:24:16 PM »
Simply7,

WOW! That's so funny. On my way driving back to swfl, I was thinking about getting the fiber closer to the actual led, and what the possibility of drilling would be to get it closer??? If you say it can be done, I'm going to give it a whirl.

I also found on the net a high power blue led laser pointer... that might also do the trick if all else fails.

Thanks again for the pointers, it was great help.

P47
« Last Edit: July 30, 2012, 04:02:59 PM by P47 »

Simply7

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Re: LED > Fiber Optic
« Reply #3 on: July 31, 2012, 05:42:43 PM »
One other thing, use liquid super glue. The superglue gel can trap air bubbles which will difuse the light.

Good luck and let us know if it works out.

P47

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Re: LED > Fiber Optic
« Reply #4 on: July 31, 2012, 07:42:28 PM »
***Update***

Much to my amazement, I drilled the led (had a set of wire drills). It was difficult as the led is an RGB and has three diodes, so the bit had be drill off the center of the dome. Superglue worked great. The results were okay, but not great. I think if I had a single led, this technique would work AWESOME (I Love it), and I am definitely going to use this in the future. Thanks Simply7 for the very cool technique.

For another method I tested, I bought a cheapo red laser pointer and focused the beam as close as I could to the one strand. The results were pretty darn good. So, I ordered a 445nm blue laser diode, as I didn't want a cheap blue/violet one. My problem might be with having too much power, as these things can light cigarettes and pop balloons. Hopefully I can adjust the driver down to a manageable level. If all else fails, I can use this to light my grill.

Backup plan>>> cheap blue/violet laser diode.

Thanks again Simply7 for the wicked tips.

P47
« Last Edit: August 04, 2012, 07:45:58 PM by P47 »

P47

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Re: LED > Fiber Optic
« Reply #5 on: August 04, 2012, 07:44:15 PM »
*** Update II ***

Well the 445 laser diode came in and the driver didn't work, luckily I bought another driver. I put on safety glasses and fired it up at it's lowest voltage only to realize this thing is just too damn crazy powerful. If I wanted my can character's torch to be functional this would be the ticket. HA! I'll save this for something else.

Backup plan II > I just ordered a few 447nm blue led's and I'm going to try Simply7's tip on drilling into the lens. I think with a single led Simply7's tact will be perfect, and I'll have a beautiful blue torch tip that you won't need safety glasses to see.

Thanks again,

P47

« Last Edit: August 04, 2012, 07:46:28 PM by P47 »

P47

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Re: LED > Fiber Optic
« Reply #6 on: August 05, 2012, 02:11:25 PM »
*** Update III ***

Laser diode too powerful for my torch effect, so I made this quick 1 1/2" outline test burning plywood at low power. It needs cooling, focus and an air pump. I tried a filled version, but it was getting too hot and I didn't want to burn it out.
« Last Edit: August 05, 2012, 02:20:09 PM by P47 »

P47

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Re: LED > Fiber Optic
« Reply #7 on: August 05, 2012, 03:43:02 PM »
Better focus...




ThantiK

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Re: LED > Fiber Optic
« Reply #8 on: August 05, 2012, 08:37:43 PM »
Wow, that's awesome.  What laser did you purchase?  I'd love to throw one of these on a 3D printer gantry and cut paper with it =P

P47

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Re: LED > Fiber Optic
« Reply #9 on: August 05, 2012, 09:50:33 PM »
ThantiK,


I'll bring it on tuesday and show it to you. I'll PM you some info. Though it's available on the net, I'd rather not post it here... don't want to be responsible for someone getting their retinas burned out.


If peeps want info PM me.


P47
« Last Edit: August 05, 2012, 09:56:23 PM by P47 »

P47

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Re: LED > Fiber Optic
« Reply #10 on: August 06, 2012, 08:14:12 AM »
ThantiK,


PM sent


P47

J. Bowser

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Re: LED > Fiber Optic
« Reply #11 on: June 20, 2013, 04:05:09 PM »
I'm looking to pump light from an LED engine into "one" strand of fiber optic. If I hold it close, I get a pretty good amount of light at the other end, but I know I'm losing a lot of energy. Does anyone have, or know where I can get a small collimating or reducing lens so I can focus the led. The led I'm using is a star shaped 3W RGB led light engine. I ripped apart an old laser pointer to get the lens assembly, but it was made for one of those tiny square leds and didn't work well. My led is approx .22" round and the fiber is .03".

Any help would be appreciated.


Thanks,

P47

I have done short of this thing but i haven't used lens. It did work for me .......
« Last Edit: June 25, 2013, 08:35:12 AM by J. Bowser »