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自锁模Cr^4+:YAG激光器的色散补偿研究 总被引:1,自引:0,他引:1
从棱镜对补偿色散的原理出发,介绍了Cr^4 :YAG锁模激光器中色散补偿的特点,发现熔融石英作为色散补偿元件,不仅可以完全补偿二阶色散,而且三阶色散也得到了一定的补偿,并得到了脉冲宽度最小为65fs,中心波长为1520nm,重复频率为120MHz的脉冲序列。 相似文献
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The development of an implantable five channel microelectrode array is presented for neural signal recordings. The detailed fabrication process is outlined with four masks used. The SEM images show that the probe shank is 1.2mm long, 100μm wide and 30μm thick with the recording sites spaced 200μm apart for good signal isolation. The plot of the single recording site impedance versus frequency is shown by test in vitro and the impedance declines with the increasing frequency. Experiment in vivo using this probe is under way. 相似文献
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本文设计了一种支持多重Fano谐振的金属-介质-金属(MIM)型表面等离子体光波导(SPW)结构,该结构由带有枝节谐振腔的直波导耦合同心双圆环谐振腔组成。利用有限元法进行数值仿真,研究了耦合距离、枝节的高度以及同心双圆环内、外环半径对Fano传输特性的影响。同时,结合磁场分布图,分析了多重Fano谐振形成的物理机理。另外,通过改变填充在同心双圆环谐振腔内介质材料的折射率研究了该结构在折射率传感器领域的应用。该波导结构具有灵敏度为1 400nm/RIU,品质因数高达1 380的传感特性。最后,本文研究了该波导结构的慢光特性,研究表明Fano峰附近的最大群折射率约为11.4,最大延迟时间约为0.076ps。这种SPW结构在纳米尺度的滤波器、折射率传感器以及慢光器件等领域有着潜在的应用前景。 相似文献
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Silicon-based microelectrodes have been confirmed to be helpful in
neural prostheses. The fabricated 7-channel silicon-based
microelectrode was feasible to be implanted into the brain cortex.
The manufacturing process by micro-electromechanical system (MEMS)
technology was detailed with four photolithographic masks. The
microscopic photographs and SEM images indicated that the probe
shank was 3mm long, 100\mum wide and 20\mu m thick with
the recording sites spaced 120\mu m apart for good signal
isolation. To facilitate the insertion and minimize the trauma, the
microelectrode is narrowed down gradually near the tip with the tip
taper angle of 6 degrees. Curve of the single recording site
impedance versus frequency was shown by test in vitro and the
impedance declined from 150.5k\Omega to 6.0k\Omega with
frequency changing from 10\,k to 10MHz. 相似文献
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