Abstract
We report on the implementation of intensity-dependent filter for picosecond pulse temporal cleaning based on an effect of pulse polarization rotation during the unbalanced phase matched second harmonic generation. The pulse contrast enhancement by more than two orders of magnitude and filter transmission of ∼25% has been demonstrated at pulse intensities of <1 GW/cm2. A simple and reliable all-solid-state filter scheme was integrated in a two-stage picosecond Nd:YAG regenerative amplifier seeded with pJ-energy femtosecond pulses of the Yb:KGW oscillator, and allowed us to reduce the ASE intensity level down to 1.5×10−8 with reference to the intensity of main 100 ps and 100 μJ pulse.
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Adamonis, J., Antipenkov, R., Kolenda, J. et al. Picosecond pulse contrast enhancement by use of polarization rotation in crystals with the second-order nonlinearity. Appl. Phys. B 106, 321–326 (2012). https://doi.org/10.1007/s00340-011-4793-8
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DOI: https://doi.org/10.1007/s00340-011-4793-8