Re: laser speckle reducer

Posted by Craig Brideau on
URL: http://confocal-microscopy-list.275.s1.nabble.com/laser-speckle-reducer-tp7586081p7586082.html

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Put together a Michelson or Mach-Zehnder interferometer and vibrate one of the mirrors. A pager motor (used to make cellphones vibrate) attached to one of the mirror mounts might do the trick. The frequency you need will depend on your sampling.

Craig

On Thu, Dec 1, 2016 at 3:11 PM, Alexander Asanov, TIRF Labs <[hidden email]> wrote:

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Dear Colleagues,

Does anyone know a laser speckle reducer, which twists, bends, and/or rotates optical fiber for temporal averaging of the speckles at the photodetector?  We have ~1W of visible light in a 100-micron fiber and have to return less coherent light back into a 100-um fiiber. Diffusers offered by Optotune and other vendors will not work. The best diffuser handles less than 600 W/cm2, while 1W in 100-um fiber translates into ~10,000W/cm. We can afford up to 40% losses, though.

Several years ago we worked with such speckle reducer made by a company from Montreal, Canada. It was a small black box fed by 5 or 12 VDC.
We need it urgently. Does anyone know a source? Thank you very much for your help.
Best regards,

Alexander Asanov, Ph.D.
President,  TIRF Labs
TIRF-Labs.com; TIRFmicroscopy.com
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