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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...
In recent years, NV centers in diamond has attracted significant attention as a candidate for quantum information devices. The negatively charged NV center, in particular, has been intensely investigated [1-3]. NV− centers host both an electron spin qubit and a nitrogen nuclear spin, in our case a nuclear spin-1/2 of 15N is imbedded. The ground state of the electron spin qubit has a long coherence...
We present results of kW-class diode laser bars with optimized fill factors, cavity lengths, and facet reflectivity that demonstrated electrical-to-optical efficiency of 70% and operation of over 100 million shots in QCW mode.
Emission of terahertz radiation may be stimulated in a bosonic system, where the final state occupation is significant. Polariton lasers represent such a system, which occupation numbers of 10000 or more for a polariton condensate are achievable at room temperature. A set of equally spaced in energy polariton condensates can be created in a parabolic lateral trap in a planar semiconductor microcavity...
Photoluminescence as a function of the time delay between two ultrafast laser pulses measures the nonlinear emission dynamics of quantum dots coupled to photonic crystal cavities and distinguishes between exciton and biexciton emission.
We study, both theoretically and experimentally, emission of correlated photon-pairs by spontaneous four-wave-mixing in silicon integrated resonators. We show that the number of generated pairs in the quantum experiment is predicted by a classical experiment.
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.
A design method for critically coupling into a weakly absorbing Si waveguide photonic crystal cavity is presented. Using this method, an ultra-compact Si+ implanted waveguide photodiode is designed with a factor of 240 increase in absorption.
The first experimental demonstration of resonant optical trapping of dielectric particles in a hollow photonic crystal cavity is reported. The existence of mutual interaction between the confined field and the particle is revealed.
An optical fiber taper placed in the near field of a “split-beam” photonic crystal nanobeam cavity with a physical gap at the cavity center breaks the system's vertical dielectric symmetry, enabling selective optomechanical coupling to multiple cantilever resonances using a single optical nanocavity mode.
We demonstrate the formation of microcavity polaritons at room temperature in a dielectric microcavity embedded with ZnO nanoparticles. Stoke shift of polariton emission is shown to be dependent on the excitonic content of the polaritons.
We present ultra-strong light-matter interaction of a metamaterial mode and an intersubband transition for normal incidence radiation in the mid-infrared spectral region. The anti-crossed lines show a splitting of 15% of the central frequency.
We demonstrate hybridization of organic and inorganic excitons via strong coupling to a common microcavity mode. The system consists of 3,4,7,8-napthalenetetracarboxylic dianhydride (NTCDA) and ZnO nanocrystals embedded in a dielectric microcavity held at room temperature.
We demonstrate sub-50 fs pulses generation directly from a 750 MHz repetition rate dispersion managed Yb: fiber ring laser by precision compensation of the intracavity dispersion.
We present the laser architecture that will be constructed as a pump laser for a Multi-TW OPCPA component test laboratory using glass rod amplifiers and a regenerative amplifier seeded by a modulated fiber laser source.
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.
In cavity-enhanced OPCPA, nonlinear phase shifts imparted on the intracavity pump pulse limit pump power loading and degrade system performance. We show that cavity-locking offsets these effects, maintaining dramatic bandwidth extension and high conversion efficiency.
We investigate cavity length detuning in a picosecond synchronously pumped optical parametric oscillator based on an aperiodically poled nonlinear crystal. A strong dependence on the sign of the quasi-phase matching period chirp is observed.
A real-time resonance tracking method is described and experimentally demonstrated in controlling an injection-seeded Q-switched Nd:YAG laser for stable single-axial-mode operation. Noise insensitive single axial mode with 100% recurrence is achieved with mW seeding power.
We experimentally demonstrate cascaded microcavities for enhanced bandwidth and extinction. The cavities are integrated into waveguides by etching three sets of quarter-wavelength trenches, each set forming a reflector. Experiments compare well with transfer matrix predictions.
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