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- W2065005970 abstract "We discuss a novel method for generating octave-spanning supercontinua and few-cycle pulses in the important mid-IR wavelength range. The technique relies on strongly phase-mismatched cascaded second-harmonic generation (SHG) in mid-IR nonlinear frequency conversion crystals. Importantly we here investigate the so-called noncritical SHG case, where no phase matching can be achieved but as a compensation the largest quadratic nonlinearities are exploited. A self-defocusing temporal soliton can be excited if the cascading nonlinearity is larger than the competing material self-focusing nonlinearity, and we define a suitable figure of merit to screen a wide range of mid-IR dielectric and semiconductor materials with large effective second-order nonlinearities $d_{rm eff}$. The best candidates have simultaneously a large bandgap and a large $d_{rm eff}$. We show selected realistic numerical examples using one of the promising crystals: in one case soliton pulse compression from 50 fs to 15 fs (1.5 cycles) at $3.0mic$ is achieved, and at the same time a 3-cycle dispersive wave at $5.0mic$ is formed that can be isolated using a long-pass filter. In another example we show that extremely broadband supercontinua can form spanning the near-IR to the end of the mid-IR (nearly 4 octaves)." @default.
- W2065005970 created "2016-06-24" @default.
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- W2065005970 date "2013-09-12" @default.
- W2065005970 modified "2023-09-23" @default.
- W2065005970 title "Generating mid-IR octave-spanning supercontinua and few-cycle pulses with solitons in phase-mismatched quadratic nonlinear crystals" @default.
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- W2065005970 doi "https://doi.org/10.1364/ome.3.001647" @default.
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