Pulse duration from interferometric autocorrelation

Voxynn
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Hi,

I have some interferometric autocorrelation traces of ~20fs pulses. Does anyone know how to convert to or calculate the actual pulse duration from the fringes of the trace?

Thanks,

Richard
 
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Are your pulses Gaussian, Sech, or Lorentzian?

Use the pulse type to figure out the time bandwidth product \delta t \delta \omega. The spectrum tells you \delta \omega. For example, a Gaussian has \delta t \delta \omega = \frac{2 \log 2}{\pi}.
Use this equation to solve for \delta t
 
Woah sorry. \delta t \delta \omega is 4 \log 2. What I quoted was \delta t \delta \nu. In case you wonder, \nu is ordinary frequency in hertz and \omega is angular frequency.
 
My pulse is gaussian (or near enough). I know how to calculate time/bandwidth product for actual spectra (wavelength vs intensity etc) but how can I extract similar info from the autocorrelation trace? I've attached a picture of the trace I have.
 

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Units?
 
The data is taken from an oscilloscope, so the units are time and voltage (intensity).
 
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