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We experimentally explore the dynamics of surface plasmons propagating along a smooth gold film as they bounce between two sub-wavelength slits. We observe ring-down features reminiscent of an optical beam in a Fabry-Perot resonator.
A nanosecond-scale recovery component is observed in time-resolved differential transmission spectroscopy experiments on the electron relaxation in n-doped quantum dots. Polarization-dependent measurements show the recovery is not due to Pauli blocking driven by spin relaxation.
By changing the polarization of less than 7fs input pulses that was coupled into the single mode birefringent photonic crystal fiber, we achieved both polarization and power modulation of the anti-stokes line simultaneously.
We report on a nanosecond MgO:PPLN OPG tunable in the MIR from 3.5 to 4.6 μm with an average output power of 600 mW at 3.8 μm and more than 100 mW at 4.6 μm.
A theoretic study about a 170% conversion efficiency enhancement of cascade ξ(2) SIIG+DFG interactions by using a c h i period quasi-phase-matched waveguide.
We demonstrated simultaneous red, green and blue light generation in periodically poled lithium niobate pumped with single picosecond laser. The primary color peaks were temperature-insensitive owing to broadband optical parametric generation of participating infrared frequencies.
We observed the directional output from GaAs micro-stadium lasers at low temperature, by the scatted emission on a ring enclosure structure. Our numerical simulation shows the directionality of the laser emission fit classical ray dynamics.
The pump pulse induced charge dynamics in quantumcascade laser structures is analyzed for typical examples of infrared and terahertz lasers in pump-probe spectra and electronic wave packet propagation using a density-matrix approach.
We report on high duty-cycle pulsed and burst-mode operation of λ ˜ 8μm quantum cascade lasers under ambient conditions for photo-acoustic spectroscopy. An optimum in average optical power and efficiency is seen around 800kHz and 50% duty-cycle.
A room-temperature negative characteristic temperature is demonstrated for a p-type modulation doped 1.3-μm quantum dot laser. A photon coupling mechanism is purposed to explain the temperature-dependent Jth for both p-doped and un-doped QD lasers.
We have developed single frequency and single spatial mode laser structures with stable narrow linewidth (<1MHz) and high optical power (40mW), using an aluminium free active region for Cs pumping at 852nm.
It is shown that the optical sidebands generated via optical parametric oscillations in a monolithic microcavity are equidistant thus overcoming the intrinsic cavity dispersion. This leads to the generation of optical frequency combs at input powers < 10 mW.
Using fully microscopic models it is shown that piezoelectric fields in InGaN/GaN quantum well structures lead to complex structural dependencies of the optical gain and carrier losses resulting in non-trivial minima for the threshold current.
It is numerically revealed and properly interpreted a phenomenon of predominant amplification of an optical mode with lower modal gain in 7-core fiber laser. Mode beating is a key factor responsible for this effect.
A photonic-crystal fiber with a mode area of 3 80 ??m2 transforms an amplified prechirped output of a femtosecond Cr: forsterite laser into supercontinuum radiation with a spectrum spanning from 700 to 1800 inn and a total energy of 1.15 ??J.
We show that the in-channel dispersion of the chirped sampled fiber Bragg gratings can be tuned by controlling the duty ratio, thus various in-channel dispersion values can be realized using a single chirped phase mask.
We have developed a novel method to produce different grating periods in one chip and applied this in the fabrication for laser array. The result shows accurate controllability of lasing wavelength and low threshold currents.
We present the use of swept wavelength interferometry for distributed fiber-optic, temperature measurements of up to 850 ??C over a lm fiber segment in commercially available, single mode, gold coated fiber. The interrogation technique is based on measuring the spectral shift of the intrinsic Rayleigh backscatter signal along the optical fiber and converting the spectral shift to temperature.
We present a simple all-optical in-band optical signal-to-noise ratio (OSNR) monitor based on orthogonal polarization detection using a polarization maintaining fiber Bragg grating.
Transmission of 20 Gb/s optical signal over 200 km of uncompensated SMF fiber is achieved. The duobinary format dispersion robustness has been exploited together with polarization division multiplexing to significantly increase the maximum uncompensated reach.
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