A bit of hopefully on-topic self advertising :

A key part for pump probe experiments is a synchronizing
controller.
Our laser sync controller is able to synchronize a picosecond
or femtosecond laser to a synthesizer with a phase noise better
than 1ps rms.

While the current series is recommended up to 200MHz, a new
controller targeted for frequencies of 500MHz or higher is
under development.

http://www.ibrtses.com/products/sync.html

Rene