Abstract
Near-ultraviolet (UV) broadband (370–470 nm) amplification up to 2.4 µJ energy from a single-pass β-barium borate (BBO) crystal is demonstrated by noncollinear optical parametric amplification (NOPA) pumped by the third harmonic (TH, 40 µJ pump energy) of Ti:sapphire laser pulses at 1 kHz repetition rate. The result of simulation with the pump depletion effect due to two-photon absorption (TPA) shows an excellent agreement with the experimental demonstration. Further simulation suggests that the intense pump (energy of 1 mJ) is useful, in spite of the increase in TPA, for obtaining high-energy amplification of 47 µJ for several femtosecond near-UV pulses with 4.7% efficiency using a commercially available high-power femtosecond laser system.
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