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Metal film materials have been widely used in optical devices, green energy field, biosensor technologies, and so on. In these applications, the properties of metal surface play the significant role. However, propagation characteristics of light in metal-based materials are still confusing. Wavelength-dependent refraction going from negative to positive at air/metal interface was reported in previous...
Femtosecond laser micro and nano-processing is a versatile material processing tool which has opened up a broad range of technologies and applications. However, in the particular context of the fabrication of deep trenches and channels, precise control of profile of the ablated structure is extremely challenging. We have recently developed a novel approach to fabricate controlled high aspect structures...
Performance of SPM based all-optical regenerator is evaluated for 40-Gb/s data. Results indicate that as the ratio between the product of fibre dispersion and length to the nonlinear phase-shift keeps constant, overall system performance improvements are similar.
Rapidly responding, high-sensitivity terahertz (THz)-wave detection with an organic DAST crystal was demonstrated using nonlinear frequency up-conversion to near-infrared light. Detection of THz-wave signals from 16.4-THz to 26.3-THz was achieved at room temperature.
We present a numerical investigation of nonlinear propagation of chirp-free femtosecond pulses at 1550-nm wavelength in a nonlinear photonic crystal fiber (PCF) with anomalous dispersion. The PCF has a second-order dispersion of − 8.67 ×104 fs2/m, third-order dispersion of 2.8×105 fs3/m and nonlinear coefficient of 11 W−1km−1 at 1550 nm. The simulation results show that efficient spectral compression...
We report the first detailed characterization, to the best of our knowledge, of wavelength dependence of two-photon absorption and the Kerr nonlinearity in silicon over a spectral range extending from 1.2 to 2.4 mum.
Nonlinearity characteristic of pump light absorption for rare-earth-doped double cladding fiber is analyzed. The characterized nonlinear effective absorption coefficient is integrated into the high power fiber laser model and numerical analysis is conducted to evaluate this new model. Our proposed model is applicable for CW fiber laser with any cavity length and any inner cladding shape design
Plasma as a nonlinear optical medium has the potential to produce extremely powerful terahertz (THz) emission when irradiated by ultrashort high-intensity laser pulses. Different schemes to produce THz emission associated with laser wakefield excitation will be discussed, which include THz emission from inhomogeneous plasma via linear mode conversion, emission from magnetized plasma, as well as from...
We experimentally demonstrate label encoding/erasure and transmission for an orthogonally labeled signal using a 40 Gbit/s DPSK payload and an IM label. The influence of the modulation depth and the label erasure are discussed.
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