Abstract

The optical parametric amplification of spectrally incoherent signals is analyzed and simulated using a set of normalized equations describing phase-matched three-wave nonlinear mixing. Varying the amplifier’s properties and the seeding conditions reveals different amplification regimes. In particular, the relative temporal walk-off of the signal, idler, and pump has a strong impact on the temporal and spectral properties of the amplified signal. The amplification efficiency for spectrally incoherent signals is not significantly lower than that of a coherent monochromatic signal, provided that the phase-matching bandwidth is sufficient. The results obtained with the normalized set of equations are in good agreement with simulations based on the full description of the crystals’ dispersion for high-gain lithium triborate and beta barium borate preamplifiers and a low-gain deuterated potassium dihydrogen phosphate power amplifier.

© 2021 Optical Society of America

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