http://confocal-microscopy-list.275.s1.nabble.com/image-databases-tp591976p591980.html
lower. But do
remember that they are very wavelength specific. You probably need one
> 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
>
>
>> Search the CONFOCAL archive at
>>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal A Faraday rotator
>> isolator is a large chunk of crystal. It will cause a lot of dispersion to
>> your pulses if you are using a femtosecond laser. Our own laser went from
>> 70fs to 300fs after passing through ours. This effect can be minimized by
>> getting as short a crystal as possible in your isolator.
>> EOT <
http://www.eotech.com/>
http://www.eotech.com/ has decent isolators
>> although it can be hard to tell which one has the shortest crystal. We
>> originally selected ours based on the assumption that the smallest entrance
>> aperture will have the shortest crystal. This turned out to not be the
>> case, so check with the company before buying. Last I heard recently that
>> their 8mm aperture unit:
>> <
http://www.eotech.com/store/products.php?categoryParentName=Faraday+Rotators+%26+Isolators&categoryName=Broadband++%28Ti%3ASapphire%29+Rotators+%26+Isolators>
http://www.eotech.com/store/products.php?categoryParentName=Faraday+Rotators+%26+Isolators&categoryName=Broadband++%28Ti%3ASapphire%29+Rotators+%26+Isolators>> actually had the shortest crystal, but make sure to check with the company
>> first.
>> Regarding the utility of an isolator, if you have any reflections at all
>> having one is critical for the stability of your laser. In some laser
>> designs the reflected light can actually be physically harmful to the laser
>> as well!
>>
>> Craig
>>
>>
>> On Thu, Feb 14, 2008 at 11:51 AM, Ann Haberman
>> <<mailto:
[hidden email]>
[hidden email]> wrote:
>>
>> Search the CONFOCAL archive at
>> <
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>>
>> Dear List,
>>
>> I am considering placing a Faraday rotator or isolator in front of a
>> two-photon laser and am wondering what others have experienced with
>> such a configuration.
>>
>> I am currently experiencing a lot of "feedback", ie return reflected
>> laser, that is wrecking havoc with my laser's stability. When it
>> senses the reflected light, it can not maintain a mode locked state
>> and can only lase in CW.
>>
>> I'm heard that a Faraday rotator should be sufficient, but I am
>> wondering if an isolator is necessary to stop the reflected light
>> from entering the cavity of the laser source. Also, I would love to
>> get a recommendation for a reliable company that makes them.
>>
>> Many thanks for any 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)
>> <mailto:
[hidden email]>
[hidden email]
>
>
>
Dept. of Chemical Sciences