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Probing of delicate systems demands high sensitivity from limited probe energy. Quantum optical techniques to beat the standard quantum limit (SQL) offer a practical advantage for these measurements. Here we report the first entanglement-enhanced measurement of a delicate material system [1]. We non-destructively probe an atomic spin ensemble by near-resonant Faraday rotation, a measurement that is...
Giant (1%) picosecond strain pulses are generated in a fs-laser-irradiated cobalt transducer sandwiched between a gold layer and sapphire substrate. Ultrafast plasmonic interferometry reveals nonlinear acoustic propagation effects in the (111) gold film.
Quantum photonics is a promising technology for implementing quantum information tasks. We demonstrate integration of multiple photon pair sources together with a circuit enabling creation and manipulation of photon pairs in a monolithic silicon-on-insulator chip.
An XUV continuum supporting 280 as isolated attosecond pulses is generated in argon with a 200 mJ, 17 fs Ti:Sapphire laser using the GDOG technique. The energy of the XUV pulse is over 100 nJ at generation location.
The effect of third-order dispersion in a Hong-Ou-Mandel interferometer is investigated using a ZnSe crystal as a dispersive medium. A value for the TOD coefficient of ZnSe is extracted which is consistent with literature values.
Using photon-number resolving detectors, we directly measure the parity of coherent states in a Mach-Zehnder interferometer. Phases are super resolved by a factor of 150 and shot noise limited measurements are demonstrated with 200 photons.
The relative carrier-envelop phase (CEP) of pulses are measured at different repetition rates, gain, and saturation levels of a three-pass amplifier, resulting in an increase of <100mrad CEP noise depending on the amplification conditions.
Examples of synthetic aperture ladar (SAL) imaging utilizing an ultra-broadband actively stabilized chirp source are presented. Demonstrations include high definition strip-map, spotlight, and bistatic mode SAL imaging and interferometric SAL for 3D surface relief imaging.
We demonstrate substrate-transferred crystalline coatings, based on epitaxial Bragg mirrors directly-bonded to fused silica, exhibiting an unprecedented tenfold reduction in Brownian noise. These mirrors promise a significant advancement in the performance of precision optical interferometers.
We report the first experimental demonstration of an entanglement-based secure communication system that is resilient to entanglement-breaking loss and noise on the communication channel.
We introduce a device for the generation of collinear, interferometrically locked ultrashort pulse pairs. Their delay is controlled with attosecond precision and stability<λ/360 in the spectral range from UV to mid-IR.
Polarization-sensitive swept wavelength interferometry is used to measure the transmission spectrum and group delay spectrum of a coupled silicon microring filter, showing high on-off contrast between passband transmission and off-band extinction.
The instantaneous frequency of a chirped pulse is directly measured by combining spectral and temporal interferometry, allowing for characterization of the stretcher of a chirped-pulse-amplification system over several nanoseconds with picosecond precision.
The steering, control or switching of electron wavepackets by light is expected to pave the way towards the much wanted visualization of nanoplasmonic field dynamics or real-time probing of electron motion in solid nanostructures. Electron pulses generated by strong-field tunneling from sharp gold tips irradiated by few-cycle laser pulses and accelerated in the near field are believed to be suitable...
We employ multiphoton photoemission to study resonant and nonresonant transitions between the occupied and unoccupied surface states at noble metal surfaces. At resonance, nondispersive bands give evidence for the existence of transient excitons at metal surfaces.
We report the first demonstration of nonlocal cancellation of differential dispersion between the long-short paths of a fiber-based Franson interferometer, restoring the otherwise limited visibility to an unprecedented 99.6% for time-energy entangled photons.
We investigate theoretically and demonstrate experimentally using reconfigurable structures that light propagation in a system of three coupled waveguides can behave in full analogy to Electromagnetically Induced Transparency and Autler-Townes effect.
We demonstrated a thermal plasmomechanical device platform for infrared detection. It integrates an optical antenna absorber on a nanomechanical resonator together with a fiber-optic interferometric readout. Performances of proof-of-concept devices are discussed.
We present a new method for intrusion detection which is based on the Mach-Zehnder interference effect. This device provides monitored surveillance by continuously measuring the intensity of light collected by a pair of photodetectors.
An interferogram from a two-staged optical low-coherence Mach-Zehnder interferometer is demonstrated to double the sensitivity improvement for fiber strain sensing using the fiber Bragg grating based optical ruler through its narrow linewidth reflection spectrum.
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