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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.
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.
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.
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.
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.
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.
Er concentration, energy-transfer upconversion and gain were investigated in Er-doped aluminum oxide channel waveguides. Net gain of up to 2.0 dB/cm was measured, demonstrating this material to provide a competitive active integrated optics technology.
Experiments and simulation demonstrate an instability of the intracavity pumped optical parametric oscillator against bidirectional operation. It is shown that nonlinear losses inside the signal cavity can stabilize the bidirectional operation.
Efficient broadband spectrum oscillation was obtained directly from a laser-diode-pumped Kerr-lens mode-locked Yb:YAG laser with intracavity nonlinear media. The spectrum was expanded to around 1040 nm to 1070 nm. The spectrum is much broader than the fluorescence spectrum at 1050 nm.
A new model of auto-oscillations in high concentration erbium doped fiber laser has been developed with accounting for statistical nature of the excitation migration and upconversion, as well as resonance-like pump-to-signal intensity noise transfer.
Doubly dressed states in a ladder-type two-photon, three-level coupling system are observed in our system. The quantum nature of the EIT system significantly suppresses Doppler broadening. The experiments were performed on a room-temperature atomic cesium cell .The cesium atoms are excited by two linearly polarized fields with parallel polarization. The spacing of the EIT doublet is strongly consistent...
We present a novel ultrafast pump-probe system, allowing for a drastic reduction in acquisition time, typically a few tens of minutes for 20,000 frames. We present acoustic waves and heat transfer measurements in nanometric layers.
Pulse compression in a differentially pumped gas-filled hollow-fiber was used to generate compressed laser pulses of 1.2 mJ at 3.7 fs, corresponding to 1.5-cycle, 0.3-TW output, from positively chirped 33-fs laser pulses.
We report on the formation of second-harmonic whispering-gallery modes (SH-WGMs) on the tapered ZnO nanotetrapod legs. The SH-WGMs have strong dependence on the polarization of the fundamental infrared excitation beam relative to the crystal axis.
We used pump-probe technique to investigate recombination dynamics of photogenerated carriers in photodiodes consisting of InAs/GaInSb W-structured superlattices. Recombination time constants of 1.6 ns and 10 ns were measured under high and low powers, respectively.
Temporal characteristics of band-edge photonic crystal lasers were explored with high resolution up-conversion system. The InGaAs/InP photonic crystal laser operates at room temperature at 1.55 mum with temporal responses indicating modulation speeds greater than 25 GHz.
Sublinear intensity dependence of photoluminescence from organic exciton-polariton microcavities under non-resonant excitation in two power regimes is shown. The sublinearity is attributed to exciton-exciton annihilation, which could compete with polariton-polariton scattering in these devices.
A radially polarized beam was amplified up to 1.1 W by passing through an Yb-doped double clad fiber pumped by a semiconductor laser, maintaining both the polarization and intensity patterns of the input beam.
A pump combiner with single-mode PM signal feed-through designed for an air-clad photonic crystal fiber is demonstrated. Signal coupling is realized by a novel taper element allowing single-mode guidance at a taper ratio of 3.7.
We characterize the behavior of optical pulse propagation in surfaces covered with silver metal nanoparticles and quantify the dispersion introduced as the pulse propagates.
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