We present a liquid refractive index (RI) sensor based on step-index multimode polymer optical fiber with a micro-hole drilled by the femtosecond laser. The experimental results show that in the RI operation range of 1.333–1.473, the sensor has a good linear loss (dB) response to the liquid RI in the micro-holes and a high sensitivity of 18 dB/RIU approximately. The experimental results are explained with the mode of the refraction loss caused by the hole–core interface and connection loss caused by the gap of the holes. The sensor has many advantages including high sensitivity and low cost.

采用氧化物高温熔融的方法制备出铒铋共掺的硼酸盐玻璃，并对其吸收光谱和发射光谱进行了研究。应用Judd-Ofelt理论计算了铒铋共掺硼酸盐玻璃的3个强度参数Ωλ（λ=2,4,6），分别为Ω2=3.8249×10-20 cm2，Ω4=1.6805×10-20 cm2，Ω6=1.5069×10-20 cm2。在此基础上，计算了电偶极跃迁的光谱强度Sed，自发辐射跃迁几率A以及吸收截面σas(ν)等参数。根据McCumber理论，计算了能级4I13/2→4I15/2跃迁的半峰全宽和受激发射截面，结果表明铒铋共掺硼酸盐玻璃的半峰全宽可达69.68 nm。

以973 nm半导体激光器(LD)为抽运源,高掺杂浓度Yb³⁺光纤为增益介质,构建了一套环形腔光纤激光器,通过调整腔内由普通光纤和偏振器件构成的偏振态滤波器,得到连续调谐宽度24 nm(1030-1054 nm)、激光阈值为49 mW的激光输出。通过对部分腔体光纤施加均匀应力的方法较大地扩展了激光器的调谐范围,实现了宽达57 nm(1021-1078 nm)的可调谐激光输出。与文献报道的基于偏振滤波原理的其他可调谐Yb³⁺光纤激光器相比,构建的激光器实现了更大范围的可调谐性。

在Pr:YSO晶体中,理论计算表明利用部分受激拉曼绝热过程可以在晶体的精细能级之间制备最大原子相干。一个探测脉冲与制备好的原子相干系统作用,可以得到增强的拉曼散射信号。还讨论了一些因素对拉曼信号强度的影响,为相关的实验研究提供了理论依据。

Polarization-independent wavelength conversion is demonstrated by using four-wave mixing (FWM) in a single semiconductor optical amplifier (SOA). In this scheme, all the incident fields are split into two orthogonal-polarized parts by polarizing beam splitters (PBS). Each of the two parts is then transmitted into one facet of the SOA and they are counter-propagating through the same amplifier. Wavelength conversion with the polarization sensitivity less than 1.3 dB is obtained over a range from 1510 to 1620 nm.

The efficiency of ultrabroad-band wavelength conversion using orthogonal-pump four-wave mixing in a semiconductor optical amplifier is measured for the wavelength shifts from 1500 to 1640 nm. The variation of conversion efficiency is <0.9 dB over the wavelength range from 1530 to 1560 nm (C-band), and <4.5 dB over the wavelength range from 1560 to 1610 nm (L-band). The maximum conversion efficiency is about -8.7 dB.