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We have demonstrated kW-peak-power terahertz (THz)-wave parametric generation and 70 dB-dynamic-range detection by using efficient surface-coupling configuration. The system is capable of producing and detecting monochromatic THz-wave pulses in the wide frequency range from 0.8 to 2.8 THz.
We provide an optical heterodyne detection configuration based on an all-fiber acousto-optic structure, which acts as both frequency shifter and coupler simultaneously, with a resolution of 0.01 nm from 10 kHz to 90 kHz.
We design, fabricate and experimentally demonstrate a novel generic method to detect flow rates velocity in microfluidic devices. The method is appealing for variety of applications where a simple and accurate speed measurement is needed.
Stabilization of the relative carrier-envelope (CE) phase for hybridly synchronized two-color fs Yb and Er fiber laser systems is demonstrated for the first time by utilizing the feedforward scheme based on an acousto-optic frequency shifter.
An uncoated glass etalon inserted in a mode-locked laser results generating two nested frequency combs. The ratio of their frequencies, insensitive to external parameters, is an accurate measure of the optical path in the etalon.
An algorithm for characterizing attosecond EUV pulses which is not bandwidth-limited, requires no interpolation of the experimental data, and makes no approximations beyond SFA while fully retrieving both the IR and EUV pulses is introduced.
Accurate frequency measurements of CO2 transitions around 2 μm are performed by direct frequency-comb Vernier spectroscopy. Measurements of pressure line shifts at the ppb. accuracy level demonstrates the application of comb sources in precision molecular spectroscopy.
We demonstrated a real-time frequency measurement of CW-THz wave using a single free-running THz comb. The absolute frequency of the CW-THz wave is measured with an accuracy of 8.7∗10−12 at a rate of 10 Hz.
We show timing jitter spectrum measurement of free-running mode-locked lasers from 1-mHz to 40-MHz Fourier frequency. The demonstrated method can resolve different noise mechanisms that cause specific jitter characteristics from <100-ns to >1000-s time scales.
We demonstrated an integrated system that can manipulate and measure vectorial field spanning up to the entire repetition period without ambiguity, iteration, and reference.
A compact iodine-stabilized laser at 531 nm is developed with a frequency stability at the 10−12 level using a coin-sized diode laser module. This laser will be used for applications including interferometric measurements.
We present the first semiconductor disk laser simultaneously emitting two gigahertz modelocked pulse trains. This simply allows to establish a link from the optical domain to a microwave frequency comb. The relative carrier-envelope-offset frequency can be accessed directly.
We show two high power 100 fs frequency combs can be coupled to the same enhancement cavity for performing time-resolved measurements of optical nonlinearities and for simplifying dual-comb spectroscopy in the XUV.
We demonstrate 119.2-GSample/s compressive microwave frequency detection using spectrally-encoded ultrafast laser pulses. We sense sparse tones over > 35-GHz instantaneous bandwidth with 2-MHz accuracy using < 300 consecutive compressive measurements acquired at a 400-MHz rate.
We demonstrate a Brillouin microcavity laser based on a microrod resonator exhibiting a frequency noise of 140 Ηζ/√Hz at 10 Hz offset. The corresponding laser linewidth is measured to be below 400 Hz.
Difference-frequency mixing two portions of a broadened Yb:fiber laser spectrum leads to an offset-free supercontinuum. To demonstrate full phase stabilization of the comb, a single comb mode was locked to an optical reference.
We succeeded in generating a coherent optical frequency comb covering more than 3 octaves from visible to mid-infrared with a waveguide-type PPLN. The generated comb is demonstrated to be useful for metrology and spectroscopic applications.
We measure the carrier envelope offset frequency of a degenerate optical parametric oscillator. We verify that it has half the value of the pump frequency comb, and sub-Hertz level relative linewidth.
Femtosecond lasers began to draw attention as a new light source for high-precision absolute distance measurements (ADMs) allowing for advanced principles such as synthetic wavelength generation, Fourier-transform-based dispersive analysis and multi-wavelength interferometry. In this talk, we present the state-of-the-art measurement principles and performance demonstrated by exploiting the unique...
We present a high-performance silicon-polymer hybrid integrated slot photonic crystal waveguide modulator. A record-high effective in-device r33 of 1230pm/V, Vπ×L of 0.282V×mm, 3-dB bandwidth of 15GHz, and energy consumption of 94.4fJ/bit are experimentally demonstrated.
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