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Dual-comb spectroscopy using electro-optic-modulator-based frequency combs broadened in a highly nonlinear fiber opens up new opportunities for analytical spectroscopy. One hundred thousand spectra per second are measurable with a 10-THz span and a 157-GHz resolution.
We demonstrated 0.9 mJ terahertz pulses by optical rectification of a high-energy Cr:Mg2SiO4 laser in large organic crystal. The emitted spectrum covers 0.1–5 THz and the peak fields exceed 42 MV/cm and 14 Tesla.
We demonstrate a thermo-optic switch comprising a 3.78μm-long coupled photonic crystal resonators coupled to a photonic crystal waveguide. The device has 6nm optical bandwidth, 20dB optical extinction ratio, 18.2mW switching power, and 14.8μsec rise time.
Multiheterodyne frequency comb spectroscopy without mode-locked lasers is reported in the near-infrared C and L telecommunication bands. The system without active stabilization combines high signal-to-noise ratio, rapid tuning and moderate multiplex spectral span.
We have demonstrated a quantum interface based on the frequency upconversion for photons carrying orbital angular momentum (OAM) states from telecom wavelength to visible regime by sum-frequency generation with high quantum conversion efficiency.
We propose a feedback method of adjusting the dual-beam exposure system with spherical collimation lenses based on deducing the spacing error from diffraction wavefront. The grating of 0.03 λ in 70×70 mm2 can be achieved.
We present preliminary results on using photo-thermal effects for gas composition analysis. Proof-of-concept experiments will be discussed and several unique detection schemes will be presented.
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 show that the sensitivity-bandwidth product of the aLIGO gravitational wave detector can be enhanced by a factor of 18, while remaining below the standard quantum limit, by employing a white light cavity configuration.
A 167-m fiber-based optical frequency comb interferometer was stabilized to nm-level with extremely wide scanning of 2.8 m by frequency scanning. Fiber noise cancellation with direct use of a frequency comb was also demonstrated.
High resolution, full-field tomograms are acquired in four exposures of a CCD camera using a swept laser. The imaged depth is selected by modulating the swept laser output power enabling volumetric imaging with no moving parts.
We devised a new output configuration for the Si-SOA hybrid laser which is suitable for high-power operation in terms of slope efficiency and suppression of nonlinear effects in a ring resonator. These advantages were theoretically evaluated. A proof-of-concept experiment demonstrated output power of > 7 mW and tunable operation with a range of 4.8 THz.
We present a compact and robust narrow linewidth laser system for onboard Rubidium atom interferometry using only one laser source based on a frequency doubled telecom fiber bench.
We observe impedance matched coupling between molecular vibrations and infrared optical antennas. Broadband synchrotron near-field spectroscopy reveals antenna-vibration hybridization, mode splitting, and tip excitation of coupled dark plasmon modes.
We present a nanoplasmonic interferometric sensor platform that can differentiate the adsorption of a thin protein layer on the sensor surface from bulk refractive index changes, exploiting the different penetration depths of multiple SPPs.
We introduce a scheme to overcome the challenges of ancillae preparation in traditional spectrally-sheared interferometry techniques for pulse characterization. The approach, applied to two-dimensional spectral shearing interferometry, reliably characterizes few-optical-cycle pulses from UV to IR.
We demonstrate an effective technique which allows one to characterize a small radius micro-ring resonator via low coherence interferometric measurement beyond light source bandwidth limitation. The experimental results show significant improvements in the extracted parameters.
We experimentally demonstrate transmission of non-orthogonal two-qubit states in a χ(3)-based optical phase-sensitive amplifier (OPSA). State analysis shows that the OPSA improves the transmission probability of both non-orthogonal states without measurable degradation in two-photon visibility.
We demonstrated an integrated system that can manipulate and measure vectorial field spanning up to the entire repetition period without ambiguity, iteration, and reference.
Two-photon and four-photon interference are realized in an interferometric fiber optical gyroscope, respectively. The visibility of four-photon interference fringe is 29.4% with a high coincidence count rate of 1000 per minute.
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