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Geometric structures of some van der Waals Complexes were determined by precisely measuring three-dimensional momentum vectors of correlated atomic ions produced in the laser-driven Coulomb explosion of these van der Waals complexes.
We demonstrate coherent control of the generalized Snell's law in ultrathin gradient metasurfaces constructed by an array of V-shaped slot nanoantennas.
A simple technique for directly generating a radially-polarized output beam from an ytterbium-doped fiber laser using an intracavity S-waveplate is reported. The laser yielded 7W of output with a corresponding slope efficiency of 67%.
We demonstrate an all fiberized, passively mode-locked thulium holmium co-doped fiber laser operating at a wavelength of ∼1.95 µm using the graphene-oxide evanescent field interaction. A temporal pulse width of ∼590 fs is experimentally obtained at 33.25 MHz.
We suggest using divergence angle as a quality parameter for pure fiber modes. We demonstrate a measurement of the divergence angle of an LP11-mode and obtain agreement with numerical predictions with 2-digit precision.
A doubly-resonant AgGaSe2 mid-infrared optical parametric oscillator (OPO) is synchronously pumped by a hybrid 2 µm Er:fiber/Tm:fiber femtosecond mode-locked laser. The OPO produces spectra ranging from 3–5 µm. Numerical simulations confirm the observed behavior.
Increasing coupling of terahertz radiation into a low dispersion, broadband two-wire waveguide is an important issue to address. To resolve this, we demonstrate an active two-wire waveguide with higher performance compared to its passive counterpart.
Optical-path length difference of Mach-Zehnder structures embedded on an optical switch can be adjusted within less than 1.6 % of FSR of the structure, without detecting radiation mode of the structure.
Waveform dependence of laser spectral compression in a dispersion-increasing fiber is investigated. Experimentally, record-high spectral compression ratios of 35.3 and 41.7 are respectively achieved using a stretch-pulse mode-locked fiber laser and an all-normal dispersion laser.
Experimental studies on the chemical detection sensitivity of high surface area photonic crystal microring resonators are presented. We report a detection sensitivity of ∼170nm/RIU for slow-light resonance modes close to the band edge.
We investigated quarter-laser-cycle oscillations in the transient absorption signal of attosecond pulse trains and infrared pulses interacting in helium. We discuss their physical origin and show their usefulness for experimental delay-zero calibration in attosecond science.
In this paper, we demonstrate dynamic strain measurement at arbitrary points by a basic BOCDA system with 500 points/s random access speed. This is the highest speed of the random accessibility reported so far.
Single-shot spectral measurements using the dispersive Fourier transformation reveal sporadic emission of parasitic Raman pulses at the output of an ultrafast Yb-doped, all-normal dispersion fiber laser. A statistical analysis reveals rogue-wave-like extreme energy fluctuations.
We experimentally demonstrate rogue event statistics of dispersive waves from 3-dimensional spatiotemporal light bullets. Similarities to fibre solitons, with the added complexity related to spatiotemporal dynamics render this system ideal for future rogue wave studies
Self-assembly approaches to construct plasmonic materials often result in high-symmetry structures within a thermodynamic limit. Here we demonstrate a novel selective self-assembly route for synthesis of a new class of nanoplasmonic structures with symmetry-breaking.
A metal/dielectric multilayered metasurface can be used to engineer the plasma frequency by controlling the ratio between the metal and dielectric layers. In this work, we demonstrate that a multilayered nanodisk metasurface based on semiconductor materials offers the design flexibility for tuning the plasmonic resonance.
We characterize high-power photodiodes under short pulse illumination for microwave generation. Photodetection limits the 10 GHz instability to 1.4 × 10−17 at 1 s, corresponding to 1/f phase noise of −135 dBc/Hz at 1 Hz.
A 1.8 W RF output power at 10 GHz and 60 % power conversion efficiency (PCE) at 6 GHz have been achieved using a modified uni-traveling-carrier photodiode flip-chip bonded on diamond.
Far field characterization of light propagation in metamaterial with multi metal-dielectric layers is performed by introducing rough surface and nano grating structures. Light directional imaging and evanescent wave moiré fringes are observed in experiments.
For the first time, we present direct experimental evidence of the presence of spatial hole burning within switchable aperiodic DFB terahertz quantum cascade lasers. This will lead towards the development of quasicontinuous tuneable terahertz lasers.
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