Complete characterization of weak ultra-short near-UV pulses by spectral interferometry |
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Authors: | M Kacprowicz W Wasilewski K Banaszek |
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Institution: | (1) Institute of Physics, Nicolaus Copernicus University, Grudzia̧dzka 5, 87-100 Toruń, Poland |
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Abstract: | We present a method for a complete characterization of a femtosecond ultraviolet pulse when a fundamental near-infrared beam
is also available. Our approach relies on generation of the second harmonic from the pre-characterized fundamental, which
serves as a reference against which an unknown pulse is measured using spectral interferometry (SI). The characterization
apparatus is a modified second harmonic frequency resolved optical gating setup which additionally allows for taking SI spectra.
The presented method is linear in the unknown field, simple and sensitive. We checked its accuracy using test pulses generated
in a thick nonlinear crystal, demonstrating the ability to measure the phase in a broad spectral range, down to 0.1% peak
spectral intensity as well as retrieving π leaps in the spectral phase.
PACS 42.65.Ky; 42.65.Re |
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