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A new laser facility with 30kJ/ns/3ω(8 beams) output energy has begun operation with good performance. Another single laser prototype pushes 1ω output energy to 17.5kJ/21ns in 350mm×350mm aperture with four-pass main amplifier architecture.
A novel capacitive micromachined ultrasonic transducer (CMUT) with dual-bottom-electrode based on standard CMOS and post-CMOS processes is presented. Compared to the traditional CMUT with single-bottom-electrode, the presented one has larger equivalent gap in emission and smaller air gap in reception for the membrane is biased much closer to the bottom electrode. A structure model is proposed for...
Capacitive micromachined ultrasonic transducer (CMUT) fabricated in standard CMOS and post-CMOS processes undergoes a series of thermal processes at about 1000degC. Thermal stress is generated in the membrane during such process. This paper studies the most severe influence of thermal stress on the performance of CMUT, such as stiffness, collapse voltage, resonant frequency, transformer ratio, coupling...
Based on the scheme of chirped pulse amplification, a Ti:sapphire laser facility with output power of 0.89 PW has been developed. The compressed pulse width of ~29.0 fs was achieved by minimizing the dispersion introduced by the optical components. The effective suppression of parasitic lasing ensured the high-gain amplification in large aperture amplifiers.
A Ti:sapphire laser with output of 0.89PW/29.0fs based on the scheme of chirped pulse amplification has been developed. The high gain amplification was achieved in large aperture amplifiers by effective suppression of parasitic lasing.
A Ti:sapphire laser with output of 0.89PW/29.0fs based on the scheme of chirped pulse amplification has been developed. The high gain amplification was achieved in large aperture amplifiers by effective suppression of parasitic lasing.
Corresponding to the disability of Synthetic Aperture Radar (SAR) to suppress Terrain Scattered Jamming, this paper proposes an anti-jamming method based on jittering orthogonal codes and random initial phase. Orthogonality between neighbor slow moments' pulse codes leads to disability of jamming to get coherent match filtering gain of range direction, at the same time, random initial phase at each...
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