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We present the first measurements of tunable laser absorption spectroscopy in femtosecond laser ablation plasmas. Time-resolved absorption spectra of uranium and aluminum are measured with high spectral and high temporal resolution.
We demonstrate the excitation of surface lattice resonances on a flat semiconductor by optical illumination of the surface. This illumination is done with a spatial light modulator that defines periodic arrays of resonant structures by local photo-excitation of free charges on the semiconductor. This approach enables a full optical control of surface modes at THz frequencies.
We report a new technique, coined free-space angular-chirp-enhanced delay (FACED), to generate large-scale, wavelength-insensitive, actively tunable optical dispersion, at least 3 orders-of-magnitude larger in dispersion than the current techniques.
A precise multi-node frequency dissemination scheme for multiple users by feed-forward digital compensation technique is demonstrated. The fractional frequency instabilities of the third-level nodes were measured as 1.79×10−15/s (2.61×10−18/100s) and 1.45×10−15/s (4.58×10−18/100s).
We study the interaction of intense THz magnetic fields with ferromagnetic thin films. At higher field intensities, the THz electric field starts playing a role, strongly changing the dielectric properties of the cobalt thin film.
We investigate the nonlinear plasmonic absorption in graphene ribbons by THz pump-probe spectroscopy. The optical nonlinearity is increased by more than one order of magnitude, which is in excellent agreement with theoretical calculations.
A method for analyzing the statistical nature of laser noise is demonstrated. By application to CEP noise characteristics, the method is shown to enable discriminating between deterministic technical and stochastic quantum noise contributions.
We report terahertz pump-probe experiments on multilayer graphene that measure both reflected and transmitted radiation. The data reveal complex reflection and transmission dynamics which calculations attribute to a transition from interband to intraband processes.
Effective axial confinement to the self-rolled-up SiNx microtube was incorporated to form a vertical microring resonator. 3× wider FSR was observed in the monolithically integrated vertical microring coupler and a silicon nitride ridge waveguide.
GLIM is a novel label-free imaging method with applicability from nanoscale topographic structures to 2–300-micron thick tissues. We present its principle and illustrate the performance with nano pillars, cells, and embryos.
We demonstrate label-free single-cell image cytometry of Euglena gracilis, a lipid-producing microalga, with a high throughput of 15,000 cells/s for evaluating and optimizing its lipid production efficiency.
The optical performance of AR surface microstructures on optics for laser systems is presented, as applied to large windows, laser crystals, lenses and optical fibers. Ultralow reflectance and very high laser induced damage thresholds have been demonstrated.
We propose a hyperspectral imaging method based on the combination of dual optical comb spectroscopy with single pixel imaging. We describe the concept of the method and demonstrate a proof-of-principle experiment.
We demonstrate that large-area plasmonic photoconductive sources fabricated on ErAs:InGaAs can offer record-high pulsed terahertz radiation power levels as high as 300 μW over 0.1–5 THz frequency range at telecommunication optical pump wavelengths.
We employ two-photon absorption and polarization-selective Michelson interferometer to measure fs-scale polarization dynamics of stationary unpolarized beams, allowing us to estimate the time span within which the polarization state remains essentially unchanged.
We propose a compact one-shot multispectral imaging method using SF-STAMP system. As a demonstration, we measure 20 spectral images in visible range (500 ∼ 650 nm) using a supercontinuum laser pulse.
An ultrahigh-speed fiber optic imager based on all-optical Haar wavelet transform is presented. Images are compressed to less than 30% of their original size by thresholding the most significant wavelet coefficients.
A silicon integrated circuit is reported for radiating picosecond pulses with tunable repetition rate, covering frequencies from 30 GHz to 1.03 THz. This source is used in a gas spectroscopy setup to measure the absorption lines of ammonia and water in the terahertz region.
We polarized ground-state population thermal-Rb in inner-wall core-coated and uncoated Kagome HC-PCFs and measured its relaxation-time rate and its dependence with the pumping-laser intensity and detuning. Enhancement in relaxation-time in coated fibers is observed.
Multi-mode random terahertz lasing with strongly localized modes has been realized for the first time, by fabricating two dimensional randomly distributed quantum cascade pillars with a small short-range order.
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