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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.
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.
We developed a new approach to fabricate high-quality single-crystalline high-index-contrast waveguiding micro- and nanostructures and demonstrated electro-optic modulation at 1.55 mum in waveguides grown from the melt of a recently developed organic material.
Using a two stage, white-light seeded, collinear, femtosecond optical parametric amplifier based on BIBO crystal, sub-30-fs signal pulses with energies exceeding 200-muJ, corresponding to 5-fold pulse shortening and ~30% internal conversion efficiency, are generated.
We apply pulse-front matching to a near-IR non-collinear optical parametric amplifier based on a bulk KTiOPO4 crystal. Pulses as broad as ~32 THz at ~1200 nm with almost no angular dispersion could be produced.
Recent progress in quantum communication highlights the need of advanced non-Gaussian states exhibiting high purity and spatio-spectral single-mode characteristics. We employ tailored waveguides and photon counting to implement efficient state preparation suitable for quantum networks.
We present the first observation of cryogenic operation in an all-solid-state refrigerator. A temperature drop of ~150 K is demonstrated in a 0.2 cm3 rare-earth doped fluoride crystal (Yb:YLF) using anti-Stokes fluorescence, at a record cooling power of 110 mW. Lowest electronic transition within Yb3+ Stark manifold along with cavity enhanced absorption and thermal-load management were key in achieving...
The THz generation efficiency in two new stilbazolium salts pumped by laser sources at telecommunication wavelengths is increased compared to DAST, the benchmark material for this application.
We experimentally study the polarization dynamics (orientation and ellipticity) of near infrared light transmitted through magnetooptic yttrium iron garnet isolator crystal pairs using a modified balanced detection scheme. When the pair separation is in the sub-millimeter range, we observed a proximity effect in which the saturation field is reduced by up to 20%. Calculations using a 1D model suggest...
A composite cavity QED system, which couples nitrogen vacancy centers in a diamond nanopillar to whispering gallery modes in a silica microsphere and overcomes limitations of earlier diamond nanocrystal based systems, is demonstrated.
We have developed the technique of two-photon joint temporal density measurements for temporal state characterization, thus facilitating two-photon generation with high temporal entanglement or nearly factorizable outputs by controlling the ultrafast pump bandwidth.
Intense terahertz transients induce in GaAs at T = 300 K coherent ballistic electron motions exploring the conduction band through half the Brillouin zone. At T = 80 K we observe terahertz driven tunneling from the valence into the conduction band.
The output performances of a Nd:YAG laser passively Q-switched by Cr4+:YAG saturable absorber are investigated function of temperature. Small variations in pulse energy and duration were observed over the 25degC to 150degC range.
We experimentally observe a spatial optical shock with negative pressure/self-focusing nonlinearity on a partially-spatially-incoherent light. We examine its basic nonlinear properties and observe statistical wave damping.
We present a tunable, frequency-stabilized, narrow-bandwidth source of frequency-degenerate, entangled photon pairs, which can address the two D-P transitions in 40Ca+ ions. We also demonstrate single ion-single photon interaction by the detection of quantum jumps.
We report a drastic coupling reduction between orthogonal modes of a Nd:YAG laser when the gain crystal is cut along the <100> axis instead of <111>. Our measurements are accurately described by a simple theoretical model.
126 mW visible light were generated by frequency doubling using bulk PPLN in a high finesse ring cavity pumped by a BAL ECDL. The locking between the two cavities is managed purely optical.
Measurements and modeling of the propagation of the fundamental and the XPW signal emerging from a nonlinear crystal show how to manage self-phase modulation and self-focusing to improve conversion in a second crystal.
Optical waveguides formed from coupled ultrahigh-Q cavities are investigated by finite-difference time-domain (FDTD) simulation. Ultra-high group velocity dispersion together with a group velocity as low as 3times10-5 c is predicted at the band edge. It is shown that full compensation of the group velocity dispersion for chip free slow light (~c/100) over a bandwidth of 230 GHz is possible using a...
We present a novel technique to achieve both high efficiency and broad bandwidth in SFG process using adiabatic conversion scheme, adapted from NMR and light-matter interaction. The robustness and tunability of the scheme are discussed.
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