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We report photonic radio-frequency arbitrary waveform generation in the W-band, enabled through optical pulse shaping and a near-ballistic uni-traveling-carrier photodiode. Example waveforms spanning 75–110GHz with long time apertures are generated and measured after wireless propagation.
A polarization line-by-line pulse shaper is used in analytically measuring optical arbitrary waveforms (OAWs) of 100% duty cycle without reference, which is essential for high repetition rate OAWs.
In this paper, we demonstrate dynamic strain measurement at arbitrary points by a basic BOCDA system with 500 points/s random access speed. This is the highest speed of the random accessibility reported so far.
A lidar system with high tolerance to background light is described. Velocity sensitivity measurements using two different signal processing methods are compared. Sensitivity of −90 dBm is realized for up to 6.9 km/s emulated speeds.
A unique experimental setup combining short pulse pump-probe and FROG characterization, enables control by light pulses over the electronic quantum state, and a direct observation of the wavefunction decoherence in a room-temperature semiconductor laser amplifier.
Determination of the absolute handedness of single enantiomer at small quantities is essential in chiral drug developments. Here we provide theoretical insights, numerical analysis and experimental demonstrations of high sensitivity to zepto moles of chiral molecules using optical metasurfaces. We introduce a figure of merit (FoM) for metasurfaces that can be extracted from simple far-field scattering...
Using a THz camera and THz bandpass filters, we measure the frequency-resolved beam profile emitted from a two-color air plasma. We observe a frequency-independent emission angle from the plasma.
We have developed Stokes polarimeter which can be available over wide terahertz frequency range by using a newly developed silicon quarter-wave plate based on form birefringence. In the system, proper polarization measurements were demonstrated successfully.
We study multi-shot intensity-and-phase measurements of unstable trains of ultrashort pulses using two-dimensional spectral shearing interferometry (2DSI) and self-referenced spectral interferometry (SRSI) in order to identify warning signs of pulse-shape instability.
We demonstrate the first technique for the complete temporal measurement of a single supercontinuum pulse. We achieve large ranges and high resolutions using polarization gating, a tilted gate pulse, and the cancellation of geometrical smearing.
We propose frequency-resolved optical gating capable of carrier-envelope phase determination using a reference pulse with a tilted pulse front. Real-time complete waveform measurement of ultrashort pulses has been demonstrated with the method.
The optical nonlocalities in metal-dielectric multilayer metamaterials are characterized as functions of incident angles for different polarizations. The measured epsilon-near-zero frequency shifts due to nonlocal effects agree with the theoretical analysis developed from transfer-matrix method.
We exhibit high-dimensional frequency-bin entanglement from a mode-locked two-photon source via frequency-correlation measurement and Hong-Ou-Mandel interference. Generalized Bell-inequality is tested by Franson interference, showing revival interference fringes, with maximum visibility of 98.6%.
Using chirp processing of ultrafast laser pulses to perform pseudorandom measurements for compressed sensing, we successfully reconstruct multi-tone sparse-frequency microwave signals with an effective sampling rate well beyond the electronic limit.
We present a CEO-stabilization technique based on optical feedback to an intra-cavity SESAM with significantly improved bandwidth compared to standard pump current control, enabling a CEO-locked Er:Yb:glass laser with ten times lower residual phase noise.
We demonstrate all-optical control of terahertz wave mode coupling in a silicon-filled parallel-plate waveguide. The resulting frequency modulation is widely tunable by moving the control beam illumination in the propagation direction.
We report the nonlinear THz conductivity of graphene. The heating of charge carriers by strong THz pulses results in a reduction of the high-frequency conductivity of graphene, in spite of reduced scattering for high-energy carriers.
We demonstrate a synthetic-wavelength interferometry system on a silicon photonic chip, comprising an interferometer with tunable power splitting ratio and photodetectors. The system enables distance measurements with errors below 5 µm and acquisition times of 14 µs.
Concept of equivalent temperature is proposed for precise temperature measurement of crystals and glasses in laser calorimetry and nonlinear optics experiments. Determination of equivalent temperature of laser irradiated crystal or glass is based on frequency shift measurement of temperature calibrated acoustic resonance, excited in the sample.
We demonstrate dynamic displacement measurement with phase-modulated light. Auto calibration using deep phase modulation makes the measurement independent of driving conditions of the modulator. Displacement of several tens nm for more-than-1-MHz vibration is successfully measured.
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