COEコヒーレント光科学セミナー【9月13日開催】
2013年09月06日
COEコヒーレント光科学セミナーを開催します。
講演では米国光学会の歴史や活動についても紹介していただく予定です。
研究室の研究員、学生の皆様もお誘い合わせのうえ、奮ってご参加ください。
| 日時 | 2013年9月13日（金曜日） 15時00分から16時30分 |
|---|---|
| 場所 | 新C棟1階103号室
|
| 講演者 | Prof. Donna Strickland 米国光学会（Optical Society of America）会長、 カナダ・ウォーターロー大学教授 Department of Physics and Astronomy, University of Waterloo, Canada |
| 内容 |
Transient multi-frequency Raman generation uses two short optical pulses having a frequency separation that matches a Raman transition to efficiently generate a wide array of Raman sidebands spanning from the ultraviolet to the infrared. Transient pumping should be the most efficient because the bandwidth of the pump matches the bandwidth of the Raman transition. However, self-phase modulation competes with the Raman process when the pulses are short. For this reason, the pump pulses are stretched by frequency chirping the pulses. When the pump pulses are positively chirped, red-shifted shoulders appear next to the Raman orders. The red-shifted shoulders have appeared with transient pumping in gas media in hollow fibers as well as in solids with broader band chirped impulsive pumping, where angle tuning has been used for phase matching. We are investigating the origin of these red shifted orders, which in some cases have more power than the Raman orders. |