发明申请
US20160266466A1 WAVEGUIDES, AND SYSTEMS AND METHODS FOR FORMING AND USING SUCH WAVEGUIDES
审中-公开
基本信息:
- 专利标题： WAVEGUIDES, AND SYSTEMS AND METHODS FOR FORMING AND USING SUCH WAVEGUIDES
- 专利标题（中）：波形，以及用于形成和使用这种波形的系统和方法
- 申请号：US15033765 申请日：2014-11-07
- 公开(公告)号：US20160266466A1 公开(公告)日：2016-09-15
- 发明人： Howard M. Milchberg , Jared Wahlstrand , Nihal Jhajj , Eric Rosenthal
- 申请人： UNIVERSITY OF MARYLAND, COLLEGE PARK
- 国际申请： PCT/US14/64480 WO 20141107
- 主分类号： G02F1/35
- IPC分类号： G02F1/35 ; H01S3/00
摘要：
Nonlinear absorption of a sub-picosecond laser pulse is used to generate one or more spatially elongated heated gas volumes. Transient density variations caused by the spatially elongated heated gas volumes provide a refractive index profile capable of guiding electromagnetic radiation through the gas. The waveguide structure in the gas is disposed between the spatially elongated heated gas volumes and results from interaction between acoustic waves generated by the spatially elongated heated gas volumes or from a non-uniform thermal gas profile caused by the spatially elongated heated gas volumes. The nonlinear absorption can be repeated at regular intervals in time and space to renew the waveguide in the gas, thereby allowing for the guiding of high average power radiation (e.g., megawatts) that is well below self-focusing or stimulated Raman scattering thresholds. The spatially elongated heated gas volumes can be generated using remote focusing of sub-picosecond laser pulses and/or multiple sub-picosecond filaments.
摘要（中）：
使用亚皮秒激光脉冲的非线性吸收产生一个或多个空间长的加热气体体积。 由空间伸长的加热气体体积引起的瞬态密度变化提供能够引导电磁辐射通过气体的折射率分布。 气体中的波导结构设置在空间细长的加热气体体积之间，并且由空间细长的加热气体体积产生的声波之间或由空间长的加热气体体积引起的不均匀的热气体分布之间的相互作用产生。 可以在时间和空间上以规则的间隔重复非线性吸收以更新气体中的波导，从而允许引导远低于自聚焦或受激拉曼散射阈值的高平均功率辐射（例如兆瓦）。 可以使用亚皮秒激光脉冲和/或多个次皮秒长丝的远程聚焦来产生空间延长的加热气体体积。