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High-speed optical data signal generation of >6.8 Gb/s with an error-free operation was successfully demonstrated using newly developed monolithically integrated quantum dot optical modulator and semiconductor optical amplifier operated in an ultra-broad optical frequency bandwidth.
Dual-comb spectroscopy without mode-locked lasers is demonstrated in the telecommunication region. As a proof-of-principle, we measure Doppler-limited rovibrational spectra of the 2ν3 band of H13C14N spanning more than 4 THz with resolved comb lines.
We demonstrate a hybrid silicon micro-ring laser design with novel thermal shunts. With this technique the hybrid silicon ring lasers with a 50 μm diameter operate continuous wave up to 105 °C.
We demonstrate InAs/GaAs quantum dot lasers on silicon-on-insulator substrates by metal-stripe wafer bonding technology. Our III-V-on-Si bonded laser exhibits room-temperature lasing at 1.3 μm with current injection through the bonding metal stripe.
Quantum-confined Stark effect of Ge(Sn)/SiGe(Sn) quantum wells (QWs) is analyzed by many-body theory. Calculated absorption spectra of Ge/SiGe-QWs are in good agreement with the experiment. Also, the effect of Sn-incorporation is investigated for mid-infrared applications.
We analyze defect-induced mode coupling in a hollow-core photonic bandgap fiber using time-of-flight, and show its utility in complementing optical time-domain reflectometry.
We report on recent results toward development of tunable and miniaturized UV-DUV radiation using microwave-driven plasma-core photonic crystal fiber. Gas-mixture optimized UV-DUV emission and highly efficient microwave ring resonators couplers are demonstrated.
A hollow core four layered Bragg fiber has been fabricated using silicon and silica as alternating layers via high-pressure chemical vapor deposition, which can be used for the guidance of near infrared light.
We present the highest average power from a diode-pumped Ti:Sapphire laser. Using self-starting SESAM-modelocking we obtain 200 mW in 68-fs pulses at 378 MHz. The laser is pumped by two air-cooled 520 nm AlInGaN laser diodes.
We demonstrate a field-portable optofluidic plasmonic sensing device, weighing 40 g and 7.5 cm in height, which merges plasmonic microarrays with dual-wavelength lensfree on-chip imaging for real-time monitoring of protein binding kinetics.
We demonstrate an on-chip spectrally reconfigurable multi-spot trap using an integrated multimode interference waveguide. This device is able to trap multiple particles simultaneously as well as transport particles along a channel in controlled manner.
We report on tapered inhibited coupling Kagome-fiber with a down-ratio as large as 2.4 while maintaining the hypocycloid-core shape. The insertion-loss of SMF spliced to tapered Kagome-fiber was measured with minimum of 0.48dB at 1550nm.
We designed and manufactured a high power WDM to enable a high power Raman lasers. We used a custom designed glass processing machine to fuse the WDM. We tested the WDM at 100 W of power with 0.05 dB loss.
We present a new approach to realize liquid-core optical waveguides via selective wetting on lithographically patterned oleophobic and oleophilic patches for sensing and adaptable optics applications.
A 1053-nm laser beam profile was controlled using the diffractive mode of a spatial light modulator in closed loop for the first time, producing high-contrast spatial intensity shaping, as well as independent wavefront control.
We demonstrate ultrahigh-speed spectral shaping of broadband laser pulses to create structured illumination of a high-speed flow for compressive microscopy. We achieve up to 39.6 gigapixel/s continuous imaging rates using a 720-MHz ADC sampling rate.
We report on single-frequency all-fiber amplifiers based on Er-Yb doped P2O5-Al2O3-SiO2 fibers. Peak power up to 1120 W at 1545 nm for 108 ns pulse duration has been obtained with 18 % slope-efficiency. Continuous-wave operation generated up to 14 W.
The linewidth of dispersion-tuned fiber laser was improved by pulse modulation. The laser was applied to swept-source optical coherence tomography system and images with deeper imaging range were obtained.
We observed an unusual conductivity increase during and after the ultraviolet-light assisted domain inversion in Mg-doped lithium niobate crystals, which may be related to the dislocation of Nb ions during the domain inversion process.
We theoretically investigate the role of point reflector's reflectivity in the performance of forward-pumped high power random fiber lasing, and demonstrate that the maximum 1st-oder random lasing output power can even increase when the reflectivity decreases from 0.9 to 0.01.
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