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Hello:

I used to have a tripled Yag pumped dye laser.  I forget if they put a 1/4
waveplate or a 1/2 waveplate to prevent reflections from affecting the laser
between the dye laser and the Yag.  The reflections do enter the laser but the
polarization rotation prevents interaction.  If you put a 1/2 waveplate, that
will rotate the polarization of the laser beam entering you microscpe, so you
will have to account for that.  Ensure that the waveplate can handle the laser
power involved.

Also, my Mira can loose modelock when I use my harmonic generator with a 'dull
surface' crystal.  The reflections from the crystals are the problem.  The new
crystals do not do this.

Input windows with a wedge or off-axis windows are sometimes used to redirect
reflections.

You might want to see what causes the reflection(s) first.

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)
____________________________________________________
Saskatchewan Structural Sciences Centre
University of Saskatchewan
Thorvaldson Bldg.
110 Science Place
Saskatoon, Sk   S7N 5C9
____________________________________________________


Quoting Ann Haberman <[log in to unmask]>:

> Search the CONFOCAL archive at
> 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)
> [log in to unmask]
>