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A sub-volt wavelength sweep operation of MEMS VCSELs is demonstrated by using a high-Q mechanical resonance. An optical sweep bandwidth of over 20 nm is exhibited with a resonance frequency of 167 kHz and a swing voltage of 0.7 Vpp. Also, a high resonance frequency could be increased over 700 kHz with a swing voltage of 5.9 Vpp thanks to high-Q resonance.
We demonstrate the high resolution beam steering of a highly dispersive VCSEL-based amplifier. By using p-type GaAs substrate, the uniform current injection was carried out for 1mm long device and we obtained the maximum deflection angle of 33° and a beam divergence angle of 0.08° resulting in resolution points of over 300.
We demonstrate the high-resolution beam-steering and amplification of novel VCSEL amplifiers, exhibiting beam steering of over 25° and sharp beam divergence of 0.1°. The output power reaches at 29mW with a chip gain of 18dB.
We demonstrate a novel wavelength demultiplexer based on VCSEL amplifier structure, which offers demultiplexing and amplification functions simultaneously. Thanks to its high resolution beam steering operation, a wavelength resolution of 0.07nm was obtained. Also, a 1 mm-long device exhibited the maximum linear gain of 28dB and saturation power of 23dBm.
A novel high speed (sub-gigahertz) and large deflection angle (>30°) beam switching in transverse-mode coupled cavity VCSEL is proposed and demonstrated. The record-high angular switching speed of 1.3×1011 °/s is achieved with narrow beam divergence of below 4° and extinction ratio of 8 dB.
We demonstrate the precise wavelength tuning of MEMS VCSELs with thermally-actuated cantilever for athermal operations. 110-channel operations with 100 GHz spacing were realized with SMSR of over 30dB and output variation of below 2.5dB.
We report on an electro-thermally tunable 850nm VCSEL, exhibiting a large negative wavelength drift of 2.0nm/K. Continuous and linear wavelength tuning of 25 nm was obtained with heating power of 9.4 mW.
We successfully demonstrated the wavelength tuning and athermal operation of micro-machined VCSELs at the same time. A small temperature dependence of below 0.002 nm/K is realized with precise continuous wavelength tuning of 1.1 nm.
Summary Ongoing basic molecular analyses are being performed in mice, and a simple long-surviving murine model of myocardial infarction (MI) would be very useful in this regard. Although a few studies have included MI in mice by coronary artery ligation, the induction involves a complex technique and has a relatively high mortality rate. In addition, the identification of the basic pathological sequence...
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