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  • Received: Apr. 21, 2020

    Accepted: Jun. 24, 2020

    Posted: Sep. 30, 2020

    Published Online: Sep. 22, 2020

    The Author Email: Mario Galletti (mario.galletti@lnf.infn.it)

    DOI: 10.1017/hpl.2020.27

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    Mario Galletti, Hugo Pires, Victor Hariton, Joana Alves, Pedro Oliveira, Marco Galimberti, Gonçalo Figueira. Ultra-broadband near-infrared NOPAs based on the nonlinear crystals BiBO and YCOB[J]. High Power Laser Science and Engineering, 2020, 8(3): 03000e29

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Representation of noncollinear phase-matching condition. o.a. is the crystal optic axis.

Fig. 1. Representation of noncollinear phase-matching condition. o.a. is the crystal optic axis.

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Parametric scan for the BiBO nonlinear crystal. (a) Simulated phase-matched wavelength (λsM) dependence of the amplified spectrum. The crystal thickness is 2.5 mm and the pump intensity is ~50 GW/cm2. (b) Simulated noncollinear angular dependence of the amplified spectrum over a range ~1.6. The crystal thickness is 2.5 mm and the pump intensity is ~50 GW/cm2. The box (translucent white) highlights the region of interest where the bandwidth is maximized but the central region (~0.9 μm) is not heavily depleted.

Fig. 2. Parametric scan for the BiBO nonlinear crystal. (a) Simulated phase-matched wavelength (λsM) dependence of the amplified spectrum. The crystal thickness is 2.5 mm and the pump intensity is ~50 GW/cm2. (b) Simulated noncollinear angular dependence of the amplified spectrum over a range ~1.6. The crystal thickness is 2.5 mm and the pump intensity is ~50 GW/cm2. The box (translucent white) highlights the region of interest where the bandwidth is maximized but the central region (~0.9 μm) is not heavily depleted.

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Simulated amplification spectrum for a 5 mm YCOB crystal pumped at 515 nm with an intensity of ~50 GW/cm2.

Fig. 3. Simulated amplification spectrum for a 5 mm YCOB crystal pumped at 515 nm with an intensity of ~50 GW/cm2.

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Simulated noncollinear angular dependence of the BiBO amplified spectrum. Crystal thickness is 2.5 mm and the pump intensity is ~50 GW/cm2.

Fig. 4. Simulated noncollinear angular dependence of the BiBO amplified spectrum. Crystal thickness is 2.5 mm and the pump intensity is ~50 GW/cm2.

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Schematic of the OPCPA chain used for crystal comparison. SHG, second harmonic generation; WLG, white light generation.

Fig. 5. Schematic of the OPCPA chain used for crystal comparison. SHG, second harmonic generation; WLG, white light generation.

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Noncollinear OPA stage seed: supercontinuum generation.

Fig. 6. Noncollinear OPA stage seed: supercontinuum generation.

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Experimental results for the YCOB NOPA stage compared to theoretical analysis. Amplified spectra for (a) 5 mm, (b) 7.5 mm and (c) 15 mm crystals. The shadowed curve is the numerically calculated amplified spectrum for the following parameters: λp = 515 nm, Ip ~50 GW/cm2, deff = 5, 7.5, 15 mm YCOB crystal thicknesses, and the signal and crystal angles are those reported in Table 2.

Fig. 7. Experimental results for the YCOB NOPA stage compared to theoretical analysis. Amplified spectra for (a) 5 mm, (b) 7.5 mm and (c) 15 mm crystals. The shadowed curve is the numerically calculated amplified spectrum for the following parameters: λp = 515 nm, Ip ~50 GW/cm2, deff = 5, 7.5, 15 mm YCOB crystal thicknesses, and the signal and crystal angles are those reported in Table 2.

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Experimental results for the BiBO NOPA stage: amplified spectrum for a 2.5 mm crystal. Different noncollinear angles are plotted to show the influence of θNC on the spectral dip around 920 nm.

Fig. 8. Experimental results for the BiBO NOPA stage: amplified spectrum for a 2.5 mm crystal. Different noncollinear angles are plotted to show the influence of θNC on the spectral dip around 920 nm.

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Theoretical amplified spectrum for LBO and BBO crystals in a noncollinear geometry to maximize the bandwidth.

Fig. 9. Theoretical amplified spectrum for LBO and BBO crystals in a noncollinear geometry to maximize the bandwidth.

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