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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...
The discovery of passive mode-locking via saturable absorbers [1] has led to optical femto-second pulses with applications ranging from eye-surgery to the analysis of chemical reactions on ultra-short timescales. In the frequency domain a train of such optical pulses corresponds to a frequency comb (equidistant optical laser lines spaced by the pulse repetition rate) [2], which finds use in precision...
We demonstrate soliton mode-locking in continuously pumped, non-linear optical MgF2 microresonators, resulting in low noise frequency comb spectra and ultra-short pulses of 200 fs duration with a repetition rate of 35.2 GHz.
We demonstrate spectral broadening of a low noise microresonator based near-infrared frequency comb to almost two thirds of an octave as required for self-referencing. The low noise properties of the unbroadened spectrum are preserved.
We spectrally broaden 1-ps pulses from a 14.3-W, 10.6-MHz thin-disk laser in a 30.5-cm long Xe-filled HC-PCF. After compression, we achieve 9.1-W in 470-fs pulses (63% overall efficiency). No depolarization or damage is observed.
Crystal quality of a new nonlinear organic material BNA was much enhanced successfully. A novel hybrid THz-wave source with extremely ultrawideband frequency tunability was proposed using new BNA and established DAST crystals.
A monochromatic THz radiation source with broadband tunability utilizing N-benzyl-2-methyl-4-nitroaniline (BNA) crystal has been developed. BNA quality was improved by applying solution growth method instead of melt method. BNA-THz source using difference frequency generation was further optimized.
A high-sensitivity, fast-response THz-wave detection using an organic nonlinear optical crystal of DAST has been demonstrated. In this report, the optimum performance of THz-wave detection was investigated in parameters such as the thickness of DAST, pump wavelength, and pumping intensity. Consequently, a higher sensitivity was obtained.
We report on the first generation of broad Raman sidebands by employing room-temperature adiabatic Raman excitation in a parahydrogen filled kagome-lattice-type hollow-core photonic-crystal-fiber. The sidebands span over 160 THz with ultra-low pump laser power.
We investigate nonlinear frequency conversion in an ultra high-Q CaF2 whispering gallery mode resonator with finesse exceeding 1 million. Raman lasing and four-wave mixing in the intermediate infrared spectral region is reported.
We discuss monolithic integration of a 100-channel AWG with a 10-GHz channel spacing with 100 Michelson-interferometer-based phase- and amplitude-modulators. The AWG showed approximately 10 dB crosstalk, and the twin-integrated devices comprise a 2?? InP wafer.
We demonstrate a polarization-insensitive single-pumped optical-parametric-amplifier by depolarizing the pump using a polarization controller followed by a piece of polarization-maintaining fiber with /spl sim/ 100-ps DGD. The polarization-dependent-gain is reduced from 8 dB to <1 dB.
We demonstrate an all-optical XOR gate based on Kerr effect in a single highly-nonlinear fiber. We obtain a 25 dB extinction ratio using 2-km of highly-nonlinear fiber with a nonlinear coefficient of 9.1 W/sup -1/km/sup -1/.
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