I assume you meant '"field autocorrelation" instead of "Intensity autocorrelaton". What was your reference regarding "I know that from intensity autocorrelation, I simply need to divide the FWHM by 1.53 for sech2 pulses."? Was that numerical factor derived in your reference?IcedCoffee said:Summary:: How do I get the pulse width from interferometric autocorrelation?
I know that from intensity autocorrelation, I simply need to divide the FWHM by 1.53 for sech2 pulses.
But I can't seem to be able to find any reference on how to get pulse width from interferometric autocorrelation signal.
Can someone help me?
Intensity autocorrelation uses second harmonic generation from two non-collinear beam. It cannot resolve the fringes of a multi-cycle pulse.Baluncore said:What is the difference between "interferometric autocorrelation" and "intensity autocorrelation"?
There seems to be some difference between "field autocorrelation" and "interferometric autocorrelation" - the latter uses second harmonic generation while the first directly measures the pulse itself. As for the reference, I couldn't find the detailed derivation but I believe taking an autocorrelation of sech2 envelope can be done.Andy Resnick said:I assume you meant '"field autocorrelation" instead of "Intensity autocorrelaton". What was your reference regarding "I know that from intensity autocorrelation, I simply need to divide the FWHM by 1.53 for sech2 pulses."? Was that numerical factor derived in your reference?
Slides 15, 17-21 have the relevant calculations; are you able to verify the numerical factors on your own?IcedCoffee said:There seems to be some difference between "field autocorrelation" and "interferometric autocorrelation" - the latter uses second harmonic generation while the first directly measures the pulse itself. As for the reference, I couldn't find the detailed derivation but I believe taking an autocorrelation of sech2 envelope can be done.
https://www.brown.edu/research/labs...ch.labs.mittleman/files/uploads/lecture14.pdf
Interferometric autocorrelation is a technique used to measure the pulse duration of ultrashort laser pulses. The sech^2 pulse is a mathematical model that describes the shape of the pulse.
In interferometric autocorrelation, the pulse is split into two identical beams that are then recombined. The resulting interference pattern is recorded and analyzed to determine the pulse duration.
The sech^2 pulse has a well-defined shape that allows for accurate measurement of the pulse duration. It also has a flat top, which makes it easier to measure the peak intensity of the pulse.
No, interferometric autocorrelation is most accurate for measuring pulses with durations in the femtosecond range. It becomes less accurate for pulses that are shorter or longer than this range.
Yes, interferometric autocorrelation can only measure the pulse duration of a single laser pulse. It cannot measure the duration of a train of pulses or pulses with varying durations.