Soliton-induced nonlocal resonances observed through high-intensity tunable spectrally compressed second-harmonic peaks

Abstract

Experimental data of femtosecond thick-crystal second-harmonic generation shows that when tuning away from phase matching, a dominating narrow spectral peak appears in the second harmonic that can be tuned over 100's of nm by changing the phase-mismatch parameter. Traditional theory explains this as phase matching between a sideband in the broadband pump to its second-harmonic. However, our experiment is conducted under high input intensities and instead shows excellent quantitative agreement with a nonlocal theory describing cascaded quadratic nonlinearities. This theory explains the detuned peak as a nonlocal resonance that arises due to phase-matching between the pump and a detuned second-harmonic frequency, but where in contrast to the traditional theory the pump is assumed dispersion-free. As a soliton is inherently dispersion-free, the agreement between our experiment and the nonlocal theory indirectly proves that we have observed a soliton-induced nonlocal resonance. The soliton exists in the self-defocusing regime of the cascaded nonlinear interaction and in the normal dispersion regime of the crystal, and needs high input intensities to become excited.

submitted, revised version

References in corpus (6)

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• Nonlocal explanation of stationary and nonstationary regimes in cascaded soliton pulse compression
• Limits to compression with cascaded quadratic soliton compressors
• On the Inhibition of Linear Absorption in Opaque Materials Using Phase-Locked Harmonic Generation
• Scaling laws for soliton pulse compression by cascaded quadratic nonlinearities
• The anisotropic Kerr nonlinear refractive index of the beta-barium borate (β-BaB2O4) nonlinear crystal

Cited by in corpus (11)

• Observation of geometric parametric instability induced by the periodic spatial self-imaging of multimode waves
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• Multiple-octave spanning mid-IR supercontinuum generation in bulk quadratic nonlinear crystals
• Experimental observation of long-wavelength dispersive wave generation induced by self-defocusing nonlinearity in BBO crystal
• Energetic mid-IR femtosecond pulse generation by self-defocusing soliton-induced dispersive waves in a bulk quadratic nonlinear crystal
• Parametrically tunable soliton-induced resonant radiation by three-wave mixing
• Raman Shifting induced by Cascaded Quadratic Nonlinearities for Terahertz Generation
• Mid-IR femtosecond frequency conversion by soliton-probe collision in phase-mismatched quadratic nonlinear crystals
• Super-resonant radiation stimulated by high-harmonics
• Mean-field equation for phase-modulated optical parametric oscillator
• Peregrine solitons and resonant radiation in cubic and quadratic media