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We report the selective amplification of a phase-stabilized optical frequency comb (OFC) by using an anti-reflect (AR) coated diode laser. We achieved the amplification factor of 10 dB around 852-nm wavelength with a bandwidth of 1.5 nm when the injected power of OFC is 1 mW. We investigated the effect of a spectral band-pass filter on the amplification of an OFC. As a practical application of the...
Micromechanical resonant displacement gain stages have been demonstrated that employ directionally engineered stiffnesses in resonant structures to effect displacement amplification from a driven input axis to an output axis. Specifically, the introduction of slots along the output axis of a 53-MHz wine-glass mode disk resonator structure realizes a single gain stage with a measured input-to-output...
The Aquarius is a L-band passive/active instrument onboard a spacecraft due for launch in 2010, targeting sea surface salinity retrieval with an accuracy better than 0.2 psu. Measurement and retrieval of salinity by the Aquarius radiometer are simulated using a radiative transfer model. The cross-polarization coupling in the antenna pattern complicates the correction of the Faraday rotation effect...
State-of-the-art millimeter-wave power transistors using quantum-well MISFET structures have been developed. Single- and double-quantum-well devices have been built, with maximum currents of 700 mA/mm for the single-well and 900 mA/mm for the double-well devices. The single-well devices delivered a power density of 0.76 W/mm with 3.6-dB gain and 19% efficiency at 60 GHz. The double well MISFETs had...
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