Is it possible to evaluate a B-integral of amplified laser pulse only from experiment data ?
Yes, if you have meausred the broadening of our laser radiation spectrum you can restore the B-integral.
so if I have a amplified pulse spectrum I can get a B-integral ? But how ?
otherwise I think I have to model a pulse propagation in amplifier and if my simulated pulse spectrum will coincide with experiment one I will be able to evaluate a B integral from its determined form, knowing from simulation a pulse intensity distribution in amplifier. That's you mean ?
I guess you are talking about ultrafast laser pulses, right? You might think about inserting e.g. a glass plate to generate defined post-pulses, which are depending on the B-Integral, converted into pre-pulses...
Yes, I try to find a way how to evaluate a B integral for ultrafast laser pulse in a fiber amplifier. B-integral determine a pulse distortion in a amplifier. So that is a some charcteristic of a amplifier. As B integral lower as it better. In common it evaluated from pulse amplification simulation and from model it determined. But is it possible to see it in experimental data ? Can you describe you scheme more detailed or give some link ? Thanks !
If you are interested in 4-wave mixing processes transforming post- to prepulses via B-Integral you might take a look at Didenko et al. 'Contrast degradation in a chirped-pulse amplifier due to generation of prepulses by postpulses,' Optics Express, 2008.
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