East China Normal University

Chongqing Institute of East China Normal University

Roi Optoelectronics Technology Co, Ltd.

Xi'an Institute of Space Radio Technology

Xiaoyue Wang

Heping Zeng

Ming Yan

Mengyun Hu

Yinqi Wang

Xiaojun Li

Jinman Ge

A laser velocimetry method and system are provided. In the method, an ultrashort pulse laser is subjected to temporal broadening, beam splitting and spectrum broadening in sequence to from a three-dimensional measurement space. When an object moves in the measurement space, a first signal light s_, a second signal light s_, a third signal light s_are generated, based on which velocity components v, v, and vof the target object can be obtained, respectively, so as to obtain the velocity of the object in accordance with a formula of v=v·i+v·j+v·k.

Ultra-high speed time-frequency fourier laser velocimetry method and system

Provided are a method and a system for measuring a transient time width of an ultrashort pulse in real time. The method includes: performing an interaction of a laser pulse to be measured with a linear chirped pulse in a second-order non-linear medium, to generate a sum-frequency beam, wherein an intensity sag occurs in the chirped pulse after the interaction; performing a time spreading by a time stretching system on the chirped pulse with the intensity sag; detecting the spread chirped pulse with the spread intensity sag by a photoelectric detector, and measuring and recording a time width &#x3c4;' of the spread intensity sag by an oscilloscope; and obtaining the transient time width &#x3c4; of the laser pulse to be measured according to a formula of &#x3c4;=&#x3c4;&#x2032;/M, where M is an amplification coefficient of the time stretching system.

Method and system for measuring transient time width of ultrashort pulse

Growing community of inventors

Chongqing, China

Xiaoyue Wang