Abstract
We present an intuitive pulse characterization method that provides an accurate and direct measurement of the spectral phase of ultrashort laser pulses. The method requires the successive imposition of a set of quadratic spectral phase functions on the pulses while recording the corresponding nonlinear spectra. The second-derivative of the unknown spectral phase can be directly visualized and extracted from the experimental 2D contour plot, without any inversion algorithm or mathematical manipulation.
Highlights
Pulse characterization and compression are of critical importance in ultrashort laser science and technology
We present an intuitive pulse characterization method that provides an accurate and direct measurement of the spectral phase of ultrashort laser pulses
The method requires the successive imposition of a set of quadratic spectral phase functions on the pulses while recording the corresponding nonlinear spectra
Summary
Pulse characterization and compression are of critical importance in ultrashort laser science and technology. A spectral phase measurement should be simple, direct and insensitive to noise In keeping with the above requirements, we consider the direct measurement of the second derivative of an unknown phase φ′′(ω). It is at that frequency that any NLO process, for example second harmonic generation (SHG), reaches its maximum possible intensity (Fig. 1b). This condition allows us to identify the position of every intersection. We include measurements from a sub-5fs laser system obtained performing a single chirp scan
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