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We theoretically demonstrate that if pump powers are kept low enough to suppress multi-pair events in integrated photon pair generation via spontaneous four-wave mixing, many other nonlinear effects are often also constrained to negligible levels.
Tunable temperature-independent triple-idler broadcasting of a signal into selective WDM channels to cover whole C and L bands is demonstrated utilizing cascaded second-order interactions in a 20-mm-long step-chirped PPLN with an engineered ∼28-nm-wide type-0 second-harmonic bandwidth.
In cavity-enhanced OPCPA, nonlinear phase shifts imparted on the intracavity pump pulse limit pump power loading and degrade system performance. We show that cavity-locking offsets these effects, maintaining dramatic bandwidth extension and high conversion efficiency.
We propose a novel low-cost photonic radiofrequency (RF) beamforming network which eliminates the dispersion induced RF power degradation. A RF bandwidth of 40 GHz and a tunable delay range of 750 ps were demonstrated.
We study the generation of broadband THz radiation (∼18 THz) with high peak electric field (∼0.5 kV/cm) using a low temperature GaAs interdigitated photoconductive antenna and a high-power, high repetition rate, 15 femtosecond Ti:Sapphire oscillator.
Synchronous high-power Yb: and Tm:amplifiers both coherently seeded by the same broadband passively phase stable Er:fiber system are demonstrated. Microjoule-level pulse energy and sub-200-fs operation at a repetition rate of 10 MHz are obtained.
An optoelectronic oscillator (OEO) tuned from 4.74 GHz to 38.38 GHz is proposed and experimentally demonstrated. To our knowledge, this is the widest fundamental frequency tunable range achieved by an OEO.
We demonstrate an ultra-broad lasing bandwidth (−3dB) of > 50 nm utilizing InAs/InGaAlAs/InP quantum-dash ridge-waveguide laser using chirped AlGaInAs barrier layer thickness. Our device exhibits a recorded bandwidth and significant improvement of laser characteristics.
We demonstrate a compact Bragg grating in a silicon-on-insulator spiral waveguide. A 3.12 mm long grating with a bandwidth of 0.27 nm has been experimentally realized within an area of 141 um × 146 um.
We experimentally show that giant EIT-based Kerr nonlinearities may make use of EIT windows narrower than the signal bandwidth, allowing for experiments with short signal pulses to benefit from this enhancement, e.g. for QND measurements.
Thermo-optic switch based on W1 photonic crystal waveguide is demonstrated, high extinction ratio of 23.5 dB has been experimentally achieved under a switching power as low as 8.9 mW while the device is only 16.8-μm-long.
We experimentally demonstrate ultra-compact (<0.008mm2), 4-channel CWDM demultiplexers using silicon photonic contra-directional couplers. Flat-top passbands of 10nm, insertion loss of lower than 1dB, and crosstalk of −20dB have been obtained.
Multi-frequency RF signal ranging from 0 to 1 GHz is highly spectrally compressed and sensed. Precise recognition of up to 40 RF tones is achieved using a single ADC with analog bandwidth of 85.2 MHz.
A 100 MHz mode-locked laser is tuned unevenly over 325 kHz with a stepper motor to produce high-SNR spectroscopic measurements of HCN with a 3 GHz spectral resolution. A setup to reduce the resulting heterodyne bandwidth is also demonstrated.
We propose and demonstrate simple and robust techniques for improving the signal-to-noise ratio of heterodyne beats between a frequency comb and a continuous wave laser beyond the shot-noise limit of a single comb mode.
Results on high-power oscillators based on Yb:CALGO in thindisk architecture are presented, in fs regime, 28W, 1.3μJ, 300 fs pulses and 20W, 0.9μJ, 197 fs pulses and in cw multimode regime 152W.
We demonstrate parametric amplification at 1.064 μm with a 600 μm2 fiber mode, with 94 nm gain bandwidth, cascade products over 315 nm bandwidth, and 6 kW peak power in the Stokes and anti-Stokes lines.
We demonstrate state-of-the-art uncooled photodetectors for low-bias (2–4V) operation with high responsivities, high saturation currents, and broad bandwidths. High responsivity (1.09A/W), high bandwidth (39GHz) and the OIP3 (47dBm) were achieved at −3V bias.
Cavity-enhanced optical parametric chirped-pulse amplification (OPCPA) extends the capabilities of nonlinear crystals beyond material property limitations, namely nonlinear-coefficient and dispersion. Here we show a dramatic increase in conversion and a three-fold increase in gain bandwidth.
A beat-wave pulse train with 66-fs pulse separation is generated from a two-color Ti:sapphire amplifier system. It can be used for quasi-phase-matched high-harmonic generation at 3-nm wavelength under 1.0×1018 cm−3 plasma density.
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