Photonic Device Design Based on BBO for Ultrafast Frequency Doubling

Group velocity mismatch becomes the main obstacle for frequency conversion of ultrashort pulses due to dispersion. To solve the problem, one design is proposed for group velocity compensated second harmonic generation in a periodically modulated BBO crystal structure： the α-BBO/β-BBO multi-layer microstructure. The results show that the device can be well applied from the visible red to the near infrared region.     

掺杂比对Hg1－xCdxGa2S4晶体频率转换的影响

在相位匹配和可接受掺杂比理论的基础上,针对Cd掺杂的不同相Hg1－xCdxGa2S4晶体,研究了掺杂比对频率转换的影响.依据相应的Sellmeier方程得到了倍频和Nd3+∶YAG与Ho3+∶YLF激光器泵浦光学参量振荡的相位匹配调谐曲线,并给出了不同掺杂下的可接受掺杂比.结果表明:掺杂晶体可实现1~5 μm范围内非临界相位匹配的倍频和1~13 μm的参量光产生;随着掺杂比的增大,可接受掺杂比近似线性减小,并随着波长改变展现出不同变化趋势.     

光纤通信实验系统

设计了多功能光纤通信实验教学系统,能产生外加信号,并将测量信号送到计算机进行数据处理.光纤通信实验激发了学生的学习兴趣,培养了学生的实践能力和创新能力.