Design and Fabrication of Six-Channel Complex-Coupled DFB Quantum Cascade Laser Arrays Based on a Sampled Grating

We designed and fabricated a six-channel complex-coupled distributed feedback （DFB） quantum cascade laser arrays based on a sampled Bragg grating. The six-channel DFB laser arrays exhibit a linear tuning range of 74nm centered at a wavelength of 7.55μm at room temperature. Robust single-mode emission with a side mode suppression ratio about 20 dB was observed, even at full power. The used sampled grating and reflectivity coating on the back facet lead to the peak output power varying from 55 to 82 m W with a small difference in slope efficiency from 100 to 128mW/A.     

高效液相色谱法测定奥硝唑阴道泡腾片中奥硝唑的含量

提出了用高效液相色谱法测定奥硝唑阴道泡腾片中奥硝唑含量的方法.以KromasilC18色谱柱(4.6 mm×250 mm,5μm)为固定相,甲醇-水(30+70)溶液为流动相,在319 nm波长处用紫外分光检测器检测.奥硝唑的质量浓度在20.0～80.0 mg·L-1之间与其相应的峰面积值呈线性关系.应用此法测定奥硝唑阴道泡腾片中奥硝唑的含量,回收率在98.9%～100.1%之间,测定值的相对标准偏差(n=6)均小于0.9%.