Re: NIR excitation light source

Posted by Craig Brideau on
URL: http://confocal-microscopy-list.275.s1.nabble.com/NIR-excitation-light-source-tp7386530p7387203.html

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To drive an LED you need a 'constant current' supply.  You can make simple
ones with a small part called an LM317, but if you aren't up to electronics
hacking then I'd recommend getting one of Thor's T-Cube drivers.  The
LEDD1B is just under $300 USD and will drive an LED up to 1200mA.  It's not
a bad deal and it should already be wired for the connectors of Thor's own
LED products.  I think it would save you a lot of time and headache.

http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=2616

Craig

On Mon, Mar 19, 2012 at 2:40 PM, Judy Trogadis <[hidden email]> wrote:

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> Hello, Martin
>
> In addition to having a drawer of filter cubes, we will now have a drawer
> of LED's. Not a bad solution. Thank you, the prices are excellent but I
> need an electronics expert because these are just the raw components.
> Perhaps my nephew in his basement . . . . . . .
>
> Judy
>
>
> -----Original Message-----
> From: Confocal Microscopy List [mailto:[hidden email]]
> On Behalf Of Martin Wessendorf
> Sent: Monday, March 19, 2012 1:46 PM
> To: [hidden email]
> Subject: Re: NIR excitation light source
>
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> Dear Judy--
>
> On 3/19/2012 12:30 PM, Judy Trogadis wrote:
>
> > Excluding lasers, does anyone know of a light source that would emit in
> NIR (around 800nm) wavelength with a good quantum efficiency? Are there
> other benchmarks to measure signal power?
>
> A conventional incandescent bulb is pretty good--I've used one for NIR
> DIC--but it really depends upon how much power you need.
>
> The following link (no commercial connection) lists NIR LEDs in the 800
> nm range; no idea of cost:  http://www.roithner-laser.com/led_diverse.html
>
> Good luck!
>
> Martin
> --
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