Anders Lindman
Penultimate Amazing
- Joined
- Sep 17, 2010
- Messages
- 13,833
According to my arithmetic, the difference in arrival times of the two signals is about 30 femtoseconds. You'll need measuring equipment capable of measuring to a precision significantly better than 30fs, and you'll have to time the pulses to a similar level of precision despite the fact that one laser is moving at 100ms-1 relative to the other.
Dave
"Optical autocorrelators are used for various purposes, in particular for the measurement of the duration of ultrashort pulses with picosecond or femtosecond durations, where an electronic apparatus (based on, e.g., a photodiode) would be too slow." -- http://www.rp-photonics.com/autocorrelators.html
"Titanium–sapphire lasers, often Kerr lens mode-locked, can generate the shortest pulses with durations down to approximately 5 fs." -- http://www.rp-photonics.com/ultrafast_lasers.html