An optical parametric generator and amplifier producing 15 ps pulses at wavelengths tunable around 2 μm, with energies up to 15 mJ/pulse, has been realized and characterized. The output wavelength is chosen to match a vibrational combination band of water. By measuring the induced birefringence changes we prove that a single pulse is able to completely melt samples of ice in the 10−6 cm3 volume range, both at room pressure (263 K) and at high pressure (298 K, 1 GPa) in a sapphire anvil cell. This source opens the possibility of studying melting and freezing processes by spectroscopic probes in water or water solutions in a wide range of conditions as found in natural environments.
Picosecond optical parametric generator and amplifier for large temperature-jump / Citroni, Margherita; Fanetti, Samuele; Guigue, Bastien; Bartolini, Paolo; Taschin, Andrea; Lapini, Andrea; Foggi, Paolo; Bini, Roberto. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 22:24(2014), pp. 30047-30052. [10.1364/OE.22.030047]
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