Posted by
S. Brunet on
URL: http://confocal-microscopy-list.275.s1.nabble.com/image-databases-tp591976p591981.html
Search the CONFOCAL archive at
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocalHello:
If you choose a waveplate or a rotator, ask the manufacturer about wavelength
range and power threshold. In either case, the travel path through the optic
is a lot less than a Faraday Isolator. The double Fresnel-Rhomb is ONE KIND of
rotator with 'broad' wavelength range, but the travel through the optical
material is big. Make sure you don't have a front reflection from the optic (I
do not know if they can AR coat these optics).
I any case, if your laser is tunable... this may be a bigger obstacle. You do
not want to realign for each wavelength. I would chase down the main source of
reflection first. Anyone else had to solve this problem? My beam path is so
big, it is not a problem.
CVI tends to give good advice on their optics and knows about short pulsed
lasers. No financial interest. I do not know if the merge/purchase of Melles
Griot changes things. Plenty of suppliers for these types of parts though and
any of them should be helpful.
Good luck!
Sophie
____________________________________________________
Sophie M. K. Brunet, Ph. D.
Research Officer
Optical Spectroscopy, Laser Systems and Applications
Chemistry 112 sessional lecturer
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306-966-1719 (office) 306-966-1702 (fax)
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Saskatchewan Structural Sciences Centre
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Quoting Ann Haberman <
[hidden email]>:
> Search the CONFOCAL archive at
>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>
> Dear List,
>
> Thank you all for the many helpful suggestions.
>
> One of the manufacturers of a Faraday isolator feels that a rotator
> by itself would be insufficient to reduce the reflected laser and
> indicated that a isolator would be necessary. Given the amount of
> dispersion I would get with just a rotator, I'm loathe to get an
> isolator. Their assumption is that the polarization of the reflected
> laser will be identical to the laser output. Is likely that it would
> be different ?
>
> The suggestion of using a 1/2 or 1/4 waveplate sounds like a good
> idea. Would there be less dispersion in this arrangement? What would
> be disadvantages of this compared to the rotator?
>
> Many thanks again for this helpful advice,
> Ann
>
> --
>
> Ann Haberman, PhD
> Department of Laboratory Medicine
> Yale University School of Medicine
> 1 Gilbert St.
> TAC S541
> New Haven, CT 06510
>
> 203-785-7349
> 203-785-5415 (fax)
>
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>