排序方式： 共有4条查询结果，搜索用时 812 毫秒
1
1.
Quasi-phase-matching(QPM) periodical poled LiNbO3 （PPLN） is designed and successfully fabricated to enable second harmonic generation (SHG),The samples were Z-cut 0.5 mm thick and grating period is A=6.8 μm for the first order QPM of contimual wave λ=1.064μm which is emitted by Nd:YAG laser at room temperature 27℃,The output single-pass SHG power was tested by an authorized optical system.The normalized max conversion efficiency is calculated to be 0.25% (W.cm)^-1,The fabrication and parameters calculated method are introduced,and testing scheme is described in this paper,Even some ideas to improve conversion efficiency are offered. 相似文献
2.
提起宏观报道，人们会想到那一篇篇气势恢宏、洋洋洒洒的大题材、大主题的重大报道。而对于媒体派往各地的驻地记者来说，由于受地域和新闻源的限制，怎么能够采写出这样的报道来呢？笔者联系做驻地记者二十余年的切身体验谈几点认识。 相似文献
3.
The supercontinuum （SC） generation at the repetition rate of 10 GHz is presented. The SC is generated in a 4.2 km conventional dispersion-shifted fiber （ DSF）, which is produced with nonlinear effects and group velocity dispersion. The DSF is pumped by an actively mode-locked Er^3＋ -doped fiber laser with pulse width of 7. 97 ps. A novel SC pulse source with a bandwidth up to 125 nm is obtained, which covers the whole C, L bands and part of S band. The stable, narrow pulses with mean pulse-width of 9.7 ps and time-bandwidth product of 0. 48 are filtered out across the whole SC bandwidth. This supercontinuum pulse source is suitable for future high-speed optical communications. 相似文献
4.
科学发展观是现代科学思维在社会发展战略。问题上的成功运用，闪烁着辩证思维的光采。我们应该如何学习和运用科学发展观抓好重点报道呢？ 相似文献
1