Confocal Microscopy List

laser speckle reducer

Classic

List

Threaded

4 messages Options

Alex Asanov

laser speckle reducer

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

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
[hidden email]

Craig Brideau

Re: laser speckle reducer

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:

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

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
[hidden email]

Eric Marino

Re: laser speckle reducer

Contact Spectral Applied Research

Eric Marino

[hidden email]

On Dec 1, 2016, at 9:09 PM, Craig Brideau <[hidden email]> wrote:

***** To join, leave or search the confocal microscopy listserv, go to: http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy Post images on http://www.imgur.com and include the link in your posting. *****
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:
*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

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
[hidden email]

Eric Girard

Re: laser speckle reducer

In reply to this post by Alex Asanov

Hi Alexander,

We produce patented all fiber laser speckle scramblers using MM silica fibers 50 to 400 um core, larger is possible. Chalcogenide, Zblan or GeO2 fibers can also be used.

Scrambling speed is programmable to over 1000 rad/s, producing significant spatial noise reduction even at 1 ms integration time.

The same is used for polarization control and scrambling with SM fiber 400 nm to 5 um.

Power handling is no problem as our insertion loss is <0.2 dB.

Best regads,

Eric Girard

[hidden email]
gigaconcept.com

Le 1 déc. 2016 5:11 PM, "Alexander Asanov, TIRF Labs" <[hidden email]> a écrit :

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

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
[hidden email]