Abstract
In optical analogy of the event horizon, temporal pulse collision and mutual interactions are mainly between an intense solitary wave (soliton) and a dispersive probe wave. In such a regime, here we numerically investigate the probe-controlled soliton frequency shift as well as the soliton self-compression. In particular, in the dispersion landscape with multiple zero dispersion wavelengths, bi-directional soliton spectral tunneling effects is possible. Moreover, we propose a mid-infrared soliton self-compression to the generation of few-cycle ultrashort pulses, in a bulk of quadratic nonlinear crystals in contrast to optical fibers or cubic nonlinear media, which could contribute to the community with a simple and flexible method to experimental implementations.
Highlights
Optical event horizon has attracted great interests soon after its proposal [1], which refreshes the understanding of nonlinear interactions of light, especially for the classic topic of the two-color pulse collision [2,3,4,5]
Here we numerically investigate the probe-controlled soliton frequency shift as well as the soliton self-compression
We propose a mid-infrared soliton self-compression to the generation of few-cycle ultrashort pulses, in a bulk of quadratic nonlinear crystals in contrast to optical fibers or cubic nonlinear media, which could contribute to the community with a simple and flexible method to experimental implementations
Summary
Optical event horizon has attracted great interests soon after its proposal [1], which refreshes the understanding of nonlinear interactions of light, especially for the classic topic of the two-color pulse collision [2,3,4,5]. Based on the cross-phase-modulation (XPM) effect, an optical event horizon is formed when an intense pump light which gives rise to a strong refractive index barrier so a weak probe light hits the barrier will be velocity inversed as well as frequency shifted, just named in the optical analogue of physics behaviors at an event horizon [1]. Such phenomena were understood in terms of the four-wave mixing effect [6]. We highlight such pulse compression schemes with the application in the few-cycle pulse generations in near- and mid-infrared, and with the implementation in a quadratic nonlinear crystal in contrast to commonly known optical fibers as well as cubic nonlinear media, which is a complementary to the experimental implementation of optical event horizon
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