Gain and bandwidth investigation in dual-pumped non-collinear optical parametric chirped pulse amplification

Abstract

Dual-pumped non-collinear parametric amplification of a chirped laser pulse is numerically studied by employing the pump beams of different wavelengths. Our results reveal that the output bandwidth and the efficiency-bandwidth product are improved, when non-collinear angles and phase matching conditions are separately optimized for each individual pump beam. Moreover, by studying the dependence of the bandwidth of the amplified signal on the pump intensity, gain stability and its fluctuations are compared in small signal gain and saturation regimes. It is verified that the effective interaction length in this dual-pumped configuration is reduced as a consequent of increased bandwidth, compared to that in a single pump scheme.

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“…We then introduce different pump beams' (different angles but same wavelength) produced ultrabroadband OPCPA, [117][118][119][120][121][122][123][124][125] and we call it the multiple-beam pumped OPCPA. [118,120,121,124] Figure 10a shows the schematic of the single-stage multiple-beam pumped OPCPA, and two pump beams with different propagation angles are used to realize two phase-matching conditions to simultaneously amplify two spectral components of the signal beam for ultrabroadband amplification.…”

“…We then introduce different pump beams' (different angles but same wavelength) produced ultrabroadband OPCPA, [117][118][119][120][121][122][123][124][125] and we call it the multiple-beam pumped OPCPA. [118,120,121,124] Figure 10a shows the schematic of the single-stage multiple-beam pumped OPCPA, and two pump beams with different propagation angles are used to realize two phase-matching conditions to simultaneously amplify two spectral components of the signal beam for ultrabroadband amplification. With the 527 nm pumped type-I LBO (in the x-y-plane, i.e., 𝜃 = 90°), Figure 10b shows the phase-matching curves when the pump angle varies from ϕ p = 12.7°to 14.7°every 0.2°, and the broadest gain spectrum (see blue curve in Figure 10c) is achieved by the phasematching condition of the purple line (ϕ s = 13.1°, ϕ p = 14.5°).…”