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We experimentally observed the self-distortion of picosecond pulses propagating in silicon wire waveguides. The asymmetry of output pulse shape was due to two-photon absorption generated free carriers within the pulse duration.
A channel waveguide exhibiting internal gain under pumping is fabricated inside erbium doped oxyfluoride-silicate glass using a femtosecond laser. The waveguide cross section and refractive index contrast is controlled using a multi-scan technique.
Imaging Bloch oscillations in curved waveguide arrays, fabricated by femtosecond laser writing in an erbium-doped glass substrate, is reported. The green fluorescence of erbium ions traces the flow of pump light along the array.
Small optical third-order nonlinearities of waveguides like hollow-core photonic crystal fibers are characterized using a femtosecond four-wave-mixing scheme. Possible perturbations arising from acoustical and optical phonons are suppressed by low-frequency operation.
Sub-picosecond all-optical switching at telecommunication wavelengths has been demonstrated by utilizing an intersubband transition of II-VI-based MQW fabricated in high-mesa waveguide devices with separate confinement heterostructure, where (CdS/ZnSe)/BeMgTe QW is employed as active layer.
We present the first full theoretical study of femtosecond pulse propagation in silicon wires. Dispersion effects up to the third order, Kerr nonlinearity, intrinsic losses, free carrier and two-photon absorption effects are included.
Waveguides were fabricated in fused silica using kHz and MHz repetition rate femtosecond lasers. Raman and fluorescence microscopy showed increases in 3-membered rings for both cases and fewer NBOHC-defects when writing with the MHz laser.
First experiments of proton exchange channel waveguides compatible with electric field surface periodic poling of congruent lithium niobate crystals are addressed. Picosecond nonlinear copropagating QPM-SHG measurements have been carried out on such structures.
A femtosecond fiber laser with 1.5-MHz repetition rate was used to write directional couplers inside bulk glasses for the first time in the 1550-nm band. Waveguide losses and coupling strengths are reported for borosilicate glass.
We have demonstrated a high-peak power output from a distributed feedback waveguide laser with a random scattering active media by using a pico-second pulse pumping. A maximum peak power of >150 kW was achieved.
We demonstrate the picosecond switching in 1D AlGaAs photonic crystal waveguides. We show the decay times vary with the structure parameters demonstrating excellent potential for ultrafast nonlinear switches with a controllable recovery time.
Measurement of spectral interference with a near-field scanning optical microscope is used to determine directly the variation of group velocity between modes of a planar slab waveguide as the modes propagate along the guide.
We demonstrated a novel two-dimensional photonic-crystal based Symmetric Mach Zehnder type all-optical switch (PC-SMZ) with InAs quantum dots acting as a nonlinear phase-shift source. The 600-mum-long PC-SMZ exhibited a 15-ps-wide switching-window at sufficiently low optical-energy of ~100 fJ.
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