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We report the operation of an optical parametric amplifier (OPA) capable of producing gigawatt peak-power laser pulses with tunable wavelength in either the visible or near-infrared spectrum. The OPA has two distinct operation modes (i) generation of > 350 μJ, sub 100 fs pulses, tunable between 1250 - 1550 nm; (ii) generation of > 170 μJ, sub 150 fs pulses tunable between 490 - 530 nm. We have recorded high-order harmonic spectra over a wide range of driving wavelengths. This flexible source of femtosecond pulses presents a useful tool for exploring the wavelength-dependence of strong-field phenomena, in both the multi-photon and tunnel ionization regimes.
David T. Lloyd,Kevin O'Keeffe,Adam S. Wyatt,Patrick N. Anderson,Daniel Treacher, andSimon M. Hooker
"Combined visible and near-infrared OPA for wavelength scaling experiments in strong-field physics", Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 1008815 (20 February 2017); https://doi.org/10.1117/12.2250775
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David T. Lloyd, Kevin O'Keeffe, Adam S. Wyatt, Patrick N. Anderson, Daniel Treacher, Simon M. Hooker, "Combined visible and near-infrared OPA for wavelength scaling experiments in strong-field physics," Proc. SPIE 10088, Nonlinear Frequency Generation and Conversion: Materials and Devices XVI, 1008815 (20 February 2017); https://doi.org/10.1117/12.2250775