A theoretical model of thulium-doped silica fiber''s ASE in the 1900 nm waveband

A theoretical model in the 1900 nm waveband for amplified spontaneous emission (ASE) of thulium-doped silica fiber is presented. The ASE spectral power as functions of the fiber length and the pump power is investigated by solving the rate and propagation equations. By calculation, when the concentration of thulium in fiber is 2.25×1025 m-3, the fiber core diameter is 2.6 μm, and the pump power is 200 mW at 808 nm, the optimal fiber length is 8.1 m, and the output power of ASE can reach 60 mW in the range o...     

太赫兹波探测器技术研究进展

对现有的几种常见太赫兹探测技术进行了总结,介绍了探测太赫兹脉冲信号的THz-TDS技术、外差探测的相干探测技术以及基于热吸收的直接探测技术。分析了等离子波探测器相对于传统电子和光子探测器的优势,并重点介绍了以石墨烯为材料的新型太赫兹探测器的研究进展。     

LGS晶体的化学腐蚀及缺陷分布

采用提拉法生长得到LGS单晶，采用磷酸作腐蚀刘，对LGS晶体做了一系列腐蚀实验。实验结果表明：对于不同方向晶面．腐蚀液的配比和腐蚀时间等条件各不相同。根据腐蚀坑可以判定．其极轴是二次轴[112^-0]方向．并可具体确定极轴方向。关于腐蚀坑的分布可以判定，在现行条件下生长的晶体具有较高的质量。