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We analyze the effects of pump settings and cavity designs of a mode-locked fiber optical parametric oscillator on the characteristics of the output pulses. Pulse generation at different repetition rates are demonstrated and characterized.
Sensitivity and dynamic range data is presented for a wideband staring RF spectrum analyzer based on parametric multicasting and spectral slicing with a periodic optical filter.
We present a monolithic silicon acousto-optic frequency modulator (AOFM) operating at 1.09GHz. Employing mechanical levers to enhance displacement of the optical resonator enables an optical frequency modulation index of 0.067.
We report the observation of second harmonic generations from an x-cut beta barium borate (BBO) disk pumped at 1557 nm. This x-cut geometry will provide a new phase matching condition for nonlinear processes in resonators.
We evaluate the optical communication performance of individual comb lines generated in silicon nitride microresonators. A high coherence mode yields error-free communications at 10 Gb/s, while a partially coherent mode results in closed eye diagrams.
We report the first experimental observation of periodic oscillations in an optically spin-injected GaInNAs/GaAs 1300 nm VCSEL under CW pumping and operated at room temperature. We show that the stability of the VCSEL can be controlled with the pump ellipticity. 11 GHz periodic oscillations were observed with the device subject to circularly-polarized (left or right) optical pumping. The highest RF...
We describe our work on engineering nonlinear optical devices using quantum dots coupled to optical resonators. These systems enable large optical Stark shifts and all optical switching with low photon numbers.
A monolithic, 27-meter long waveguide having optical loss of less than 0.1dB/m is demonstrated. The same process produces resonators having Q factors as high as 875 million. Applications are reviewed.
Phase conjugation can be used to correct blurred images caused by atmospheric turbulence and scattering of light by biological tissues. In the past, phase-conjugation devices based on photorefractive effect have response times of 100 µs – 1 s [1]. Four-wave mixing in a third-order nonlinear medium can be also used to achieve optical phase conjugation [2]. This scheme, demonstrated in Ref. [3], requires...
CMOS-compatible III–V/Si vertical-cavity surface-emitting lasers (VCSELs) based on a double set of photonic crystal reflectors are demonstrated, showing single-mode continuous-wave operation at 1.55-µm with thresholds in the sub-mW range.
Epitaxial-like colloidal quantum dot films are demonstrated as potential single material system for red, green, and blue lasing. These prospects derive in part from the access to single exciton gain in the optically dense films.
We present direct bandgap photoluminescence from carrier confinement in Ge/SiGe quantum wells in a microdisk resonator. Based on simulation and experimental results, the Ge/SiGe quantum well structure has great potential to serve as a low pump power Ge laser.
We analyze hyper-parametric oscillations in optical microresonators characterized with small group velocity dispersion (GVD) and show that the nonlinear process critically depends on linear interaction among the microresonator modes. The mode interaction changes the local GVD, resulting in either a significant reduction or increase of the oscillation threshold.
We have demonstrated a novel optical-parametric chirped-pulse amplification scheme with diverged pump beam for ultraboradband phase-matching. Over 400nm ultrabroadband amplified pulses was successfully obtained at 1000 nm center wavelength with a gain of 1.2×105.
Femtosecond mid-IR pulses were coupled into a quantum cascade laser. The spectral broadening and far-field profile of the transmitted pulses showed an intensity dependence. n2 was experimentally estimated to be on the order of ∼10−9cm2/W.
We present nonlinear effects induced by an intense terahertz field on the transmission response of metamaterial structures fabricated on silicon wafer, as well as ultrafast modulation in the terahertz response of our devices.
We present a numerical bit-error rate investigation of 160–640 Gbit/s serial-to-parallel conversion by four-wave mixing based time-domain optical Fourier transformation, showing an inverse scaling of the required pump energy per bit with the bit rate.
All-fiber Bessel-like beam generator achieved optical trapping and displacement control of micron particles. A pair of generators being compatible with lab on a chip system can be good tools for manipulation and analysis of bio-sample.
In micro-fluidic devices, a small amount of fluid flows along the pre-determined channels to be chemically analyzed, or to activate mechanical/optical functions. Such devices have been extensively used in biochemistry, medical science, and optical engineering. One of the essential techniques in micro-fluidics is to monitor the fluid flow with high accuracy. Currently the flow can be analyzed using...
We developed a novel approach to produce silver doped As2Se3 rib-type waveguide. By employing continuous wave four-wave mixing we verified that the medium has very high nonlinearity, which is promising for compact devices.
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