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We develop a miniaturized electrostatically tunable optomechanical oscillator, whose frequencies can be electrostatically tuned by as much as 10%. By taking advantage of the optical and the electrical spring, the oscillator achieves a high tuning sensitivity without resorting to mechanical tension. Particularly, the high-Q optical cavity greatly enhances the system sensitivity, making it extremely...
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.
Quantum cascade lasers (QCLs) are complicated unipolar semiconductor devices based on intersubband transitions and resonant tunneling. In this study, femtosecond mid-infrared (Mid-IR) pulses are employed to investigate the nature of carrier transport through the active and injector regions of a room temperature, pulse biased ultrastrong coupling design QCL. Despite the low average power (<1 mW)...
In this paper, a Nano-opto-mechanical (NOM) switch is designed, simulated and experimentally demonstrated, using the electromagnetically induced transparency (EIT)-like effects of coupled-ring resonator. The control of the switch is realized by optical force between the silicon waveguide and the dielectric substrate. As the injection pump power increases from 0 to 6 mW, the normalized power of transmission...
A compact, portable rubidium atomic beam clock based on lamp pumped and fluorescence detection scheme is proposed. The expected short-term frequency stability can be more than two orders of magnitude better than previous experimental results. The usages of lamp pumping, fluorescence detection and microwave slow-wave resonance structures make this design robust and compact. The shortcomings will be...
In a room temperature 4.5 μm QCL resonantly pumped with fs Mid-IR pulses, we observe an ultrafast gain recovery within the first 200 fs, gain oscillation within the 1 ps and a slower gain recovery of lifetime ∼2–3 ps.
Room temperature second harmonic generation at λ=2.2 μm has been obtained from a 4.5 μm quantum cascade laser resonantly pumped by TM or TE polarized λ=4.5 μm femtosecond pulses through the front facet.
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