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We observed an unusual conductivity increase during and after the ultraviolet-light assisted domain inversion in Mg-doped lithium niobate crystals, which may be related to the dislocation of Nb ions during the domain inversion process.
We demonstrate an ultrastable Yb:fiber amplifier delivering 145 fs pulses with 6 μJ energy at 10 MHz repetition rate. The Er:fiber seed laser provides inherently synchronized broadband continua whose power is boosted via optical parametric amplification.
Pulse trains from dual combs with different repetition rates are coupled and directed onto a target for simultaneous absolute distance measurement. Non-ambiguity range extension is immune to drift and accuracy is about 100 nm.
We report a compact, stable, 79.5-MHz, Yb-fiber-based, picosecond UV source generating 1.2-W of power at 355 nm with a stability better than 0.4% rms over 3 hours, and pointing stability <45 μrad in good spatial-beam-quality.
We report on all periodically-poled crystals based singly-resonant optical parametric oscillator (SRO) generating continuous-wave, single-frequency, tunable UV radiation with maximum output power of 336mW in 18.5 MHz line-width at 399.2nm. It has tunability of 18nm.
We show how time ordering effects in single photon frequency conversion (FC) can be revealed by using the fact that the joint conversion amplitude in FC is a nonlinear function of the pump electric field.
Broadband transparency, high thermal conductivity, and strong nonlinearity make gallium nitride a promising material for high power frequency conversion. We have fabricated and tested periodically oriented gallium nitride (PO-GaN) devices for quasi-phase matched (QPM) frequency conversion.
Tunable coherent radiation is generated in the VUV down to 121 nm using random quasi-phase-matching in strontium tetraborate, the shortest wavelength ever produced with a second-order nonlinear optical process in a solid-state material.
We report the progress of a quantum repeater with quantum frequency conversion to telecom wavelengths, which allows for quantum communication over long distances.
YAl3(BO3)4 crystal enables the highest UV power of 1.8 MW and shortest pulse of 118 ps with power conversion efficiency of 37 % at 266 nm by using LBO crystal and Nd:YAG/Cr:YAG microchip laser.
We present a widely tunable polarization converter with ultra-broad working frequency for microfluidic metasurface. By adjusting the configuration of L-shaped antenna, both cross and circular polarization conversion can be achieved under a linear-polarized illumination.
We demonstrate single-photon-level phase preservation in an up-converting interferometer. The up-conversion process is background-free to within experimental uncertainty, allowing high fringe contrast even at low photon levels. This enables faithful up-conversion of entangled photon pairs.
Using shaped pulses and nonlinear optics, we have experimentally demonstrated the demultiplexing of a train of polarization-encoded single photons through time-to-frequency conversion. We have shown this technique to preserve polarization entanglement with a partner photon.
We demonstrate complex mid-IR spectral phase and amplitude shaping spanning 2.5–5 μm, based on down-conversion of a shaped near-IR source, using chirped-pulse adiabatic difference frequency generation. The technique can be extended to multi-octave bandwidths.
χ(2)-nonlinearity enhanced by crystal lattice contribution in the THz-region is behind backward stimulated polariton scattering with efficiencies exceeding 50% in PPKTP where forward scattering process is suppressed. 10-times compression of counter-propagating signal is observed.
We demonstrated CW SHG at 400 nm in a first-order QPM adhered slab waveguide with a periodically-poled Mg-doped stoichiometric lithium tantalate core. The measured SHG normalized conversion efficiency was 34.7%/W for a 20 mm length.
A wideband microwave photonics mixer is experimentally demonstrated based on the use of phase coherent orthogonal carriers, generated from single sideband modulation in dual drive Mach-Zehnder modulator and polarization-rotation in semiconductor optical amplifier.
We present an experimental study of a metasurface, which exhibits electric and magnetic resonances, in order to understand their independent contributions to second-harmonic generation. A hydrodynamic model framework is used to match experimental results.
We investigate the behavior of resonant-induced harmonics from tin using driving lasers with tunable wavelengths. The intensity of the resonant harmonic is suppressed by the tuning laser wavelength around 1.8μm to understand the interaction dynamics of continuum electron with the autoionizing states.
The frequency distinguishability of photon pairs was controlled using spectral reshaping via cross phase modulation. A non-classical dip in a Hong-Ou-Mandel quantum interference experiment was observed for the photons with diminished spectral distinguishability.
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