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We achieved a sub-fs thermal-noise-limited noise floor in a balanced optical-microwave phase detector and demonstrated long-term stable RF extraction with <1 fs RMS drift and <7 fs pk-pk for over 10 hours of continuous operation.
We focus a short writing pulse burst into a photo-resist, polymerizing a voxel. The time-resolved transmission of a co-focused second laser probes the voxel formation dynamics. We measure time constants as small as 400 µs.
Low-loss nonlinear AlGaAs waveguides are fabricated using plasma-assisted photoresist reflow. A 6.8-dB continuous-wave four-wave mixing conversion efficiency in a 1.35-µm-wide waveguide, and a 44-nm half-width 3-dB bandwidth in a 0.65-µm-wide waveguide are demonstrated.
We present a chalcogenide microwire device that acts as a compact (∼11 cm length, ∼1 µm diameter) and power efficient (sub-Watt threshold peak power, >2% slope efficiency) Raman-parametric laser, wavelength converter and ultra-broadband supercontinuum generator/amplifier.
Monolayer graphene sheet has been integrated on top of small disk optical resonator in SOI platform. Electro-optic interaction between graphene and whispering gallery mode of the cavity has been demonstrated and studied for modulation application.
We present a highly efficient laterally-coupled 1.55 µm DFB laser monolithically integrated with multistage MMIs and SOAs, using low bias currents and providing an output power of ∼100 mW with a low divergence angle.
We present the experimental observation of the slow-light enhancement effect on the generation of a frequency comb formed by stimulated Brillouin scattering (SBS) in a chip scale As2S3 rib waveguide.
We propose a new tool for scaling the speed of arbitrary patterned illumination by two-dimensional spectral-encoding. A multi-objective optimization based on genetic algorithm is presented for its utility in different imaging modalities.
We report our latest experimental results of the half-wave coupled rectangular ring-FP laser. Wavelength tuning of 50 channels covering L band at 100GHz spacing is achieved, with SMSR up to 41dB. Direct modulation at 2.5Gbps is also demonstrated.
We experimentally demonstrate spectral broadening and shaping of weak mono-exponentially decaying pulses via nonlinear mixing and phase modulation. This method is compatible with single photons wavepackets generated by quantum emitters.
Monolithic Fan-out PPMgSLT device is demonstrated to generate third harmonic generation from 1064nm laser. By integrating single and fan-out QPM structures into one device, 100mW of third harmonic was obtained without any critical tunings.
Concatenation of two different higher-order-mode fibers (HOMFs) was used to extend the soliton wavelength shift beyond the mode-crossing wavelengths of the fibers. A 3.5 nJ, 55 fs soliton was obtained at 1170 nm.
We experimentally study the relative intensity noise of Raman solitons and find that earlier ejected Raman soliton exhibits lower noise. We also observe the bound soliton pair existing in a large range of excitation power.
We present an atmospheric turbulence simulator based on a spatial light modulator, using phase screens generated by Fourier Transform method. The effects of different atmospheric turbulence on laser beam are successfully demonstrated.
We demonstrate power-efficient noise-insensitive optical waveform generation from directly modulated lasers combined with periodic time-frequency windowing. Real-time experiments with direct FPGA-driven lasers achieve near-theoretical communication performance at Gbit/s rates using flexible and scalable transceiver designs.
We report a tunable pulsed optical parametric oscillator using a double-prism domain PPLN as simultaneously an electro-optic Q-switch and a parametric generator in a Nd:YVO4 laser. >2.3-kW peak-power eye-safe light was obtained with this system.
355 nm generation was confirmed by using a novel ferroelectric QPM device, PP-LBGO with Fan-out structure as a third harmonic of 1064 nm light. More than 100 mW was generated without any walk-off.
We developed an adhesive bonding process to integrate silicon nanomembranes onto silicon chips. A grating-coupled 1-to-32 H-tree optical distribution is experimentally demonstrated with an excess loss of 2.2 dB and a uniformity of 0.72 dB.
We investigate Raman wavelength conversion in CF4-filled hollow-core photonic bandgap fibers. We obtain a record of more than 35% conversion efficiency in a 35cm-long, weakly pressurized, fiber at a peak power of only 2.6kW.
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