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Yes, you need single mode fiber matched to the wavelength of the laser.
 ThorLabs sells patch cords pre-built for this purpose:
http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1362
They tend to be a good price.  You might find another vendor in your area
that offers similar.

The only thing to check is whether the fiber is terminated FC/PC (flat
cleave polished connector) or APC (angled polish).  The APC connectors have
a very slight angle on the tip to help prevent back reflections.  The most
common is FC/PC but it's good to check.

One option is to have a stainless steel jacket put on the fiber, which I
usually recommend for anything carrying a laser.  You have to request this
special order though.  The default is just a plastic cable, which will
work, but I prefer the steel just to be extra safe.

Craig



On Mon, Nov 25, 2013 at 2:20 AM, Pascal Weber <[log in to unmask]>wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> *****
>
> You should always use a mono mode fiber. You can find it in the laser
> dealer.
> It is not really expansiv.
>
> Cheers
>