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Time-resolved mid-infrared pump-probe measurements in a quantum cascade laser operating above threshold reveal gain recovery dynamics to be two-fold: relaxation within a stage on a sub-picosecond scale and transport between stages on a picosecond scale.
3D FDTD is used to study the effect of surface roughening on the emission of a point source embedded in GaAs with a mirror behind the dipole. Enhancement factors of 10 : 1 are observed.
A laser-accelerated beam of protons is used to isochorically heat a silicon foil to multi-eV temperatures. Proton dosimetry, self-emission, and synchronized reflective interferometry are used simultaneously to infer internal energy, temperature, and pressure.
Coherent control of two-photon induced birefringence in azoaromatic polymers was achieved by shaping the phase of the spectral components of ultrashort pulses. The signal dependence on chirp and phase mask were studied and modeled.
We present a contrast filter reaching 12 orders of magnitude from micro to milliJoule input pulse with 24% efficiency. It solves contrast issue for Petawatt class lasers in microjoule seeded CPA or double CPA scheme.
We report the first realization of quantum correlation transferring. The initial two correlated twin beams are generated from two separated OPO and laser. The transferred intensity quantum correlation degree of 1 dB below SNL is measured.
Multimode operation of an optical parametric oscillator operating below threshold is calculated. We show that maximal squeezing can be obtained at high frequency even in the presence of seed laser noise and cavity length fluctuations.
Homodyne measurement of mean photon number within an optical sideband is performed and discussed. Comparison with single photon detector data illustrates the versatility of the technique and supports a quantum mechanical description of vacuum noise.
An individual incoherent eavesdropping on a two-way quantum protocol for deterministic communication without entanglement is stimulated. The results show that the protocol remains secure regardless of the noise caused by the eavesdropper.
We study the quantum state transfer (QST) from a photon polarization to an electron spin. We reveal the condition for high-yield and high-fidelity QST by solving the time-dependent Schrodinger equation.
We have generated squeezed vacuum in optical telecommunication band by a single-pass parametric amplification in periodically poled lithium niobate. The measured noise reduction was 3.1 dB below the shot-noise level.
We report the experimental observation of EIT in Cs2 in Lambda configuration. The width of EIT is smaller than widths of molecular transitions and has different dependence on temperature. Application to quantum storage is discussed.
We theoretically present that generation of entangled-photon pairs from biexcitons in a quantum well is dramatically enhanced by using a microcavity. Itpsilas optimal condition is qualitatively understood from the characteristic feature of the cavity QED.
In this paper we propose a new technique that enables optical single sideband generation for optical subcarrier multiplexing. A high sideband suppression ratio is achieved across the full RF spectral band.
We theoretically show that the effects of the carrier-envelope-phase is significant even in the multiphoton ionization regime with an essential difference on the phase-dependent dynamics compared with the tunneling ionization regime.
We have developed single frequency and single spatial mode laser structures with high optical power, using an aluminium free active region, which are to our knowledge the first demonstration for Cs pumping at 852 nm.
We have developed a novel technique to remove measurement noise generated by pinhole diffraction in confocal microscopy. We compared the refractive index measurement results using our technique with those obtained using a traditional system.
We investigate the fabrication of dielectric components for surface plasmon polariton (SPP) processing by two-photon polymerization of photosensitive materials on metal surfaces. SPP guiding and focussing will be demonstrated using near- and far-field optical microscopy.
We present a diode laser concept for precision spectroscopy which is based on a novel optical feedback scheme that combines excellent frequency stability (< 35 kHz line width in 290 ms) with good tuneability (45 GHz continuously, 50 nm overall).
A new type of hydrogen sensor with a side-polished fiber Bragg grating coated with thin palladium film was demonstrated with the Bragg wavelength shift of 0.12 nm in the case of 99% hydrogen concentrations.
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