Focus conditioning effects on molecular field-free alignment observed with high-order harmonic generation

• 作者: 吴家骏 尉鹏飞
• 来源期刊: 中国激光
• 年，卷（期）: 2012,（8）
• 所属期刊栏目: 激光器与激光光学
• 页码范围: 31-34
• 页数: 4页
• 语种: 中文
• DOI: 10.3788/CJL201239.0802007

摘要

We investigate the focus conditioning effects on molecular field-free alignment observed with high-order harmonic generation (HHG) from CO2 molecules.We also experimentally demonstrate that both the spectral shape and alignment signal of HHG significantly vary with changing focus position.A maximal alignment signal is achieved at a given focus position because of the optimal intensity of the driving laser.This intensity is related to the ionization potential of the molecules.These results indicate that a unique focus position provides an optimal alignment signal for practical applications.