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Opt Express. 2010 Mar 29;18(7):6945-56. doi: 10.1364/OE.18.006945.

Autocorrelation and phase retrieval in the UV using two-photon absorption in diamond pin photodiodes.

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Westfälische Wilhelms-Universität Münster, Physikalisches Institut, 48149 Münster, Germany.


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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