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In photonic crystal fibres (PCF), light propagates in either a solid or hollow-core surrounded by a periodic microstructured cladding, which greatly affects its optical properties. We will report recent results for both types of PCF.
Hollow-core photonic crystal fibers (HC-PCF) offer a combination of long effective interaction length and small mode areas which has resulted in several major breakthroughs in low-power nonlinear optics. Recently, it was shown numerically that such fibers offer unique properties in terms of efficiency and low threshold for high harmonic generation. In addition to the substantial decrease in pump threshold,...
Here we report the observation of soliton-like pulses generated by BSRS in a gas-filled photonic crystal fiber (HC-PCF). The excellent performance of HC-PCF for SRS studies was shown recently in the quasi CW-regime. In the present experiment, we have observed high energy pulses of duration (0.7 ns) significantly shorter than the irreversible phase relaxation time T2 of the Raman transition. The fact...
We report the first HHG in a hollow-core photonic crystal fiber. We generate the 7th-13th harmonic of ap800 nm in xenon. The extremely low threshold of 0.4 muJ would be achievable by multimegahertz solid-state lasers.
Metallic nanowire arrays are created by pumping molten metal into the hollow channels of silica glass PCF. Measurements show that, at certain wavelengths, the core-guided light couples to leaky surface plasmon modes on the nanowires.
Acoustic resonances trapped within the glass core (1 mum diameter) of a photonic crystal fibre are excited electrostrictively using laser pulses. Using pulse sequences they can be coherently controlled leading to a 100-fold increase in their amplitude.
We demonstrate the fabrication of low-loss up-tapers in SMF-28 using a conventional tapering rig. Waist diameters of 240 mum, uniform over several cm, have been produced. The technique also works for photonic crystal fibers.
We report new nonlinear features observed in an adiabatically tapered photonic crystal fiber. When using femtosecond pulses, the soliton self-frequency shift and generation of nonsolitonic radiation result in a dasiashark-finpsila-shaped feature in the power-dependent spectrum.
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