Coherent Phonon Detection in Ge with a Femtosecond Laser

• 来源期刊: 中国物理快报(英文版)
• 学科: 物理学
• 年，卷（期）: 2001,（7）
• 所属期刊栏目: CONDENSED MATTER：ELECTRONIC STRUCTURE
• 页码范围: 979-981
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

A highly sensitive femtosecond photodeflection spectroscopy technique was first developed experimentally. Using femtosecond laser pulses we have detected ultrafast coherent phonon emission in a Ge plate. It is found that the ultrafast femtosecond laser pulses generate coherent phonons in the plate via the electronic mechanism.Supersonic expansion of photo-excited electron-hole plasma is observed.