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We propose and numerically demonstrate a resolution enhancement technique for patterns acquired by microscopes and oscilloscopes based on spatial or temporal periodic modulation of an object, transmission and restoration of the input spectrum by parts.
Highly efficient cavity dumping of Yb:YAG laser has been realized at room temperature with the optical to optical conversion efficiency of 72% for the absorbed pump power.
A novel type of hybrid amplifier/wavelength converter is presented, coupling a TDFA and a FOPA module in series. Signal amplification over the entire S-Band (1450-1530 nm) and signal-to-idler conversion from 1540-1630 nm is demonstrated.
Pulses that have been super-broadened by a third-order nonlinearity are frequently used when generating a phase stabilized output. But how can such temporally mangled pulses retain any useful phase information?
The noncentrosymmetric molecular structures responsible for the second order nonlinear effects of collagen fibrils are identified by sum frequency vibrational spectroscopy. CH2 and C=O functional groups dominate the achiral and chiral spectra, respectively.
We report on a superresolution image enhancement technique that can improve the spatial resolution of digital photomicrography employing typical pixelated image sensors. A bulk-micromachined micromirror is used to control the image location with subpixel accuracy.
Powerful ultrashort pulses are generated using a hybrid MOPA consisting of a passively mode-locked semiconductor laser and a Yb-doped fiber amplifier. Pulses 2 ps in duration are amplified to an average power of 0.8 W.
We investigate the impact of laser source coherence time on bit error rate (BER) and autocorrelation function performances of a direct sequence OCDMA system. Congruence codes are suggested to reduce the observed coherence effects.
We demonstrate mode switching in tandem quasi-stadium laser diodes. Switching is achieved by optical injection between lasing in the cavity axis and the closed ring trajectory of a quasi-stadium laser resonator.
We report on strong coupling between a discrete optical mode of a high-Q micropillar cavity and single excitons of self assembled In0.43Ga0.57As quantum dots and compare the results with previous studies on In0.3Ga0.7As quantum dots.
A phase sensitive receiver for Optical Code Division Multiplexing (OCDMA) waveforms generated by spectral phase coding (SPC) using phase and polarization diversity offers expanded system capacity due to low values of multiple access interference (MAI).
We have made cross-shaped polarization-switching VCSELs for dual-channel optical communications. The polarization of the device is controlled by its asymmetry in geometry and current injection. High switching power ratio of over 20 between two polarization states has been achieved.
Dipole-dipole interactions between Rb atoms at internuclear distances 100-1000 Aring are probed at noncryogenic conditions, based on femtosecond laser parametric four wave mixing and wavepacket modulation. Theoretical analysis of the novel results is offered.
The optical and microwave spectra of 5-mm-long quantum-dot diode lasers are investigated. Comparison of observed beating lines with quantum-well lasers shows differences in the group index, linewidth, and line shape.
A compact multi-loop stretcher system with a pulse confining structure was demonstrated. This system generated chirped pulse with 32 ps/nm chirp rate. The energy loss in the stretcher was compensated by the OPCPA.
We have investigated the behavior of dissociative ionization of ethanol molecules under irradiation of 400 nm and 800 nm femtosecond laser pulses. When changing the time delay and intensity ratio between these two pulses, fragmentation significantly changes.
Tomography of high harmonic generation in a cluster jet was achieved by using laser machining. The growth curves help explain the optimal backing pressure, which is ascribed to the change in phase matching condition.
Pump power scaling with spot size is studied experimentally and theoretically in a 1060 nm VECSEL with a diamond heatspreader. The dependence of the efficiency and thermal roll-over on pump spot size are discussed.
We have reported periodic pore formation with diameter in 80 nm and aspect ratio above 250 on N+(100) silicon substrate and demonstrated the fabrication of silicon 3-dimensional microstructures by applying double directional etchings method.
We have experimentally demonstrated quantum key distribution with a heralded single photon source and a photon number resolving detector. Numerical calculations have shown the expansion of the distance.
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