East China Normal University

Chongqing Institute of East China Normal University

Roi Optoelectronics Technology Co, Ltd.

Xi'an Institute of Space Radio Technology

Ming Yan

Heping Zeng

Mengyun Hu

Junyi Nan

Xiaoyue Wang

Jinman Ge

Yinqi Wang

Xiaojun Li

Tianjian Lv

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

The present disclosure discloses a method and apparatus for preparing a femtosecond optical filament interference direct writing volume grating/chirped volume grating. The method is characterized in that optical filaments are formed in glass by using femtosecond pulse laser, and plasma is controlled to quickly scan in the glass and etch a volume grating or chirped volume grating structure by adjusting the focal length of convex lens, laser energy and movement of motor machine. The apparatus includes a femtosecond pulse laser module, a pulse chirp management module, a pulse time domain shaping module, a laser separation and interference module, a glass volume grating processing platform module and a camera online imaging module.

Method and apparatus for preparing femtosecond optical filament interference direct writing volume grating/chirped volume grating

A Raman spectrometric imaging method, including: placing a sample on a two-dimensional translation stage; emitting a first light beam by a first optical comb light source; dividing the first light beam into a pump light beam and a depletion light beam to illuminate the sample; guiding the pump light beam to illuminate a region of the sample to excite molecules of the sample in the region; guiding the depletion light beam to the region of the sample to make excited molecules at a periphery of the region to return into a vibrational ground state; emitting a second light beam as a probe light beam by a second optical comb light source to the remaining excited molecules to generate a CARS signal; recording the CARS signal for imaging; moving the two-dimensional translation stage to scan other regions of the sample to form an image of the sample.

Non-contact spatial super-resolution coherent Raman spectrometric imaging method

The present disclosure discloses a method and apparatus for manufacturing a microfluidic chip with a femtosecond plasma grating. The method is characterized in that two or more beams of femtosecond pulse laser act on quartz glass together at a certain included angle and converge in the quartz glass, and when pulses achieve synchronization in time domain, the two optical pulses interfere; Benefited by constraint of an interference field, only one optical filament is formed in one interference period; and numbers of optical filaments are arranged equidistantly in space to form the plasma grating. The apparatus for manufacturing the microfluidic chip includes a plasma grating optical path, a microchannel processing platform, and a hydrofluoric acid ultrasonic cell.

Method and apparatus for manufacturing microfluidic chip with femtosecond plasma grating

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.

Growing community of inventors

Chongqing, China

Ming Yan