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The unique combination of the LCLS x-ray laser with high-power nanosecond and femtosecond laser beams at the Matter of Extreme Conditions allows precision pump-probe studies of high energy density plasmas. For this purpose, we are building a new 200 TW laser system to measure and uncover the underlying physics mechanism that determine the interaction of ultra intense laser beams with matter. The repetition...
We demonstrate a cold-atom Raman laser that operates quasi-continuously with as few as 0.2 photons on average inside the cavity and with a single-atom Raman decay rate below 1 Hz. We demonstrate that the laser's coherence is primarily stored within the atoms, and consider the relationship between the Schawlow-Townes linewidth and the standard quantum limit on phase estimation using unentangled atoms...
We demonstrate a pump-probe phase-contrast method that reconstructs the spatio-temporal profile of plasma structures at density as low as 1016 cm−3. The method is compatible with very thin, very long, even turbulent media.
We report on the first demonstration of the locking of a 28000 finesse cavity in picosecond regime. Besides, we have unambiguously measured the CEP drift of 2 ps pulses and characterized its effect on cavity locking.
We report on the generation of coherent N2+ emissions in a plasma string driven by two-color laser fields and measure their temporal structures. It is confirmed that the coherent emissions originate from seed-injected amplification.
We present the measurement of χ(3) nonlinearity of Green Fluorescent Protein. The nonlinear index is n2 = 10−19m2/W, opening the possibility of using genetically engineerable and naturally occuring proteins in cells as a source of four wave mixing experiments.
We investigate deformations of fluid interfaces caused by small (∼nN) optical force of a low power laser beam under total-internal-reflection. For air-water interface deformations are undetectable, unlike recently claimed in ref. [3]. Using a critical fluid-fluid interface having weak surface tension large fluid-lens effects in the form of a bump are seen. Our observations support standard optofluidic...
I present a new cross-correlation frequency resolved optical gating (X-FROG) algorithm, based on the principal components generalized projections (PCGP) algorithm that is fast, robust, and simple.
The relative carrier-envelop phase (CEP) of pulses are measured at different repetition rates, gain, and saturation levels of a three-pass amplifier, resulting in an increase of <100mrad CEP noise depending on the amplification conditions.
The radiation pattern of plasmon-based optical Yagi-Uda antenna was measured in a quasi-homogeneous medium realized by immersing the antenna in a liquid. The directional gain of the 5-element antenna was found to be about 3.7, consistently with the theoretical prediction.
We present the latest results in extending dual-comb spectroscopy to two-photon resonances. By measuring two-photon excitation of rubidium vapor and water-dissolved fluorophores, we demonstrate both the high resolution and speed of the technique.
We report on orthogonally polarized dual-wavelength operation of a continuous-wave Yb:KGW laser. Gain equalization of the two wavelengths with the Nm- and Np-polarizations was attributed to the effect of anisotropic thermal lensing.
We measure the polarization evolution of ultrashort pulses (filaments) propagating in air for various pulse widths and energies. We observe the change of light ellipticity close to circular polarization.
By coating a layer of polydimethylsiloxane (PDMS) on the silica microcavity surface, we observe the Raman laser emission from PDMS, which is to our knowledge the first demonstration of polymer cavity Raman laser.
We present work looking at the two-photon optical characterization of water soluble chemical probes based on surfactant nanomicelles encapsulation and ormosil PEBBLEs as well as in-vitro two-photon imaging of oxygen and hydrogen sulfide.
We report for the first time an alternative way to detect the mode splitting in a silica microcavity through measuring the heterodyne beat note signal of a Raman laser mode.
We validate the use of a quadriwave lateral shearing Wave Front Sensor (WFS) to make an ISO compliant M2 measurement. We compare measurements made following the ISO standard method with those made with the WFS.
We have proposed and developed a scanning laser terahertz (THz) imaging system using a 1.56μm femtosecond fiber laser for high-spatial resolution and high-speed measurement. The laser pulses are scanned over a 2D THz emitter plate such as DASC(4'-dimenthylamino-N-methyl-4-stilbazolium p-chlorobenzenesulfonate), GaAs, and ZnTe crystals by a galvano meter. In this system, THz wave pulses locally generated...
We characterized luminescent properties of InGaN nanodisks in both quantum well and dot regimes. The luminescent efficiency increases as strain is relaxed in the quantum well but peaks at the transition from well to dot.
No currently available clinical technique is capable of visualizing and quantifying the structure and function of the middle ear. Various pathologies directly impede the conduction of sound-induced vibrations through the human middle ear, and thereby produce a ‘conductive’ hearing loss. Direct clinical assessment of sound conduction by middle ear structures has been limited to measurements of the...
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