Ultrashort Laser Pulse Phenomena, 2nd Edition

494 Measurement Techniques of Femtosecond Spectroscopy

if the gating function I

g

(t) is known. Indeed, if I() is the Fourier transform of

the gate function I

g

(t), and S() is the Fourier transform of the measured signal

S(τ

d

), the Fourier transform f () of the physical quantity f (t) is just the ratio:

f () =

S()

I()

. (10.2)

The physical quantity f (t) can be calculated by taking the inverse Fourier

transform of Eq. (10.2). This deconvolution technique can be applied in numer-

ous cases where the gate function I

g

(t) does not depend on the phase of the

interaction.

1

10.3. BEAM GEOMETRY AND TEMPORAL

RESOLUTION

To obtain a better quantitative understanding ...