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Autocorrelation and phase retrieval in the UV using two-photon absorption in diamond pin photodiodes
Nils Fabian Kleimeier1, Thorben Haarlammert, Henrik Witte
1Westfälische Wilhelms-Universität Münster, Physikalisches Institut, 48149 Münster, Germany.
Abstract:
We report on the utilization of the two-photon induced free carrier generation in a diamond pin-type photodiode to record fringe-resolved second-order autocorrelations of femtosecond pulses in the UV. Measurements in photovoltaic mode are performed at the second and third harmonic of a Ti:sapphire laser (lambda(0)=401 nm and lambda(0)=265 nm) with pulse energies down to about 2 nJ. The band gap of diamond of 5.5 eV sets a short wavelength limit at about 225 nm. Combined with the simultaneously recorded linear autocorrelation the spectral phase is reconstructed employing an iterative algorithm.
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