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The atmospheric profiling of water vapor is necessary for finding life on Mars and weather on Earth. The design and performance of a water vapor lidar based on a Tm:germanate fiber laser is presented.
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A quartz-enhanced photoacoustic spectroscopy based gas sensor was optimized to improve its compact spectrophone design and performance. The impact of a 2-tube microresonator geometry on the detected signal and signal to noise ratio (SNR) was investigated. Experimental studies demonstrate that the l=4.4 mm long tubes (ID=0.5 mm) result in a significantly enhanced SNR.
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We design dispersion-compensated Raman/EDFA hybrid amplifiers recycling residual Raman pump for WDM systems. The first experimentally demonstration of broad band gain-clamped and gain flattened dispersion-compensated Raman/EDFA hybrid amplifiers by recycling residual Raman pump with a single FBG for WDM systems.
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We have demonstrated bulk (51 mum thick) photonic metamaterial based on anodized alumina membranes filled with silver. The material is highly anisotropic and follows the hyperbolic dispersion law at lambda>0.84 mum.
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We investigate the phenomenon of resonant-infrared laser ablation of polymers using polystyrene as a model material. Ablation is initiated by a picosecond free-electron laser tuned to various infrared wavelengths that are resonant with vibrational modes of a polystyrene target. Time-resolved plume imaging, coupled with etch-depth measurements and finite-element calculations of the temperature rise...
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We have developed a hybrid optical tomography system combing optical coherence tomography (OCT) and line-scanning fluorescence laminar optical tomography (FLOT). This system could be used for concurrent depth-resolved tissue-structural and molecular imaging.
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We demonstrate the advantage of combining high-resolution Fourier domain optical coherence tomography (OCT) with wide-field time-gated fluorescence lifetime imaging microscopy (FLIM) for a comprehensive morphological and biochemical characterization of atherosclerotic vulnerable plaques (VP).
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Electroabsorption properties of 1.3mum InAs/InGaAs/GaAs quantum dot electroabsorption modulator (EAM) are investigated. Onset of absorption to higher electric field suggests the potential to achieve higher optical power handling capability than conventional EAM.
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We demonstrate robustly single-mode power scaling in fiber laser systems built using 35-mum core Yb-doped double-clad chirally-coupled-core (CCC) fibers. Up to 250 W have been demonstrated up to date and further power scaling is in progress.
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Coherent terahertz emission and hard x-ray emission from a laser-driven plasma in a solid target are measured simultaneously revealing a complementary picture of the ultrafast plasma.
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We propose pilot decision-aided maximum likelihood phase estimation for nonlinear-phase-noise-dominant coherent optical phase-shift-keying (PSK) systems. The receiver sensitivity is shown to be improved by ~1 dB compared to the differentially encoded PSK counterparts.
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We demonstrate quantum entanglement and global spin dynamics between a few trapped ions, using lasers that couple to all modes of transverse motion in a way that could be scaled to large numbers of spins.
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A mode-locking mechanism by active gain modulation is studied numerically and experimentally. The parameter window for the emission of stable pulse trains was found. Pulses as short as 3 ps (~0.5 pJ) were characterized by second-order autocorrelation.
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We investigate Hartman saturation effect in multilayer dielectric stacks. We show that the experimentally observed jumps of photon transversal times due to adding single quarter-wave layers to structures is caused by appearance of surface modes.
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Using the unique characteristics of multiphoton ionization with focused femtosecond pulses, we report on a pump and probe metrology to analyze carrier dynamics inside dielectrics. We characterize the sub-picosecond trapping of carriers inside fused SiO2.
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Relaxation and emission dynamics of a dense quantized magneto-plasma excited by intense femtosecond laser pulses in In0.2Ga0.8As/GaAs multiple quantum wells are probed by time-resolved transient absorption and time-resolved photoluminescence experiments in high magnetic fields.
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Terahertz is nonlinearly upconverted to telecommunication wavelengths, resulting in detection with 4.5 pW/Hz1/2 noise equivalent power and nanosecond temporal resolution. Optical frequencies from an ultrashort pulse mix, generating 3 mW of broadband terahertz.
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We demonstrate second harmonic generation from a single GaAs nanoneedle with a wurtzite crystal structure. The optical anisotropy of the polar crystal results in strong nonlinear optical conversion compared to normal zincblende GaAs.
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A method for thermal-stabilization of silicon microdisk resonators, based on thermooptic polymer coatings, is proposed. Two orders of magnitude improvement in thermal stability is expected. Effects on Q and major fabrication challenges are discussed.
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The amplification of light by a single excited molecule in free space is demonstrated in this paper. The extinction effect is the result of a destructive interference between the incident laser beam and the coherently scattered light from the molecule in the ground state. Thus, inversion of the population should lead to a phase shift of the scattered light and amplification of the laser light.
