Ultra-short pulse dispersion reshaping and amplitude division technology-based ultrahigh-speed optical imaging system and method

Abstract

The invention discloses an ultra-short pulse dispersion reshaping and amplitude division technology-based ultrahigh-speed optical imaging system and an ultra-short pulse dispersion reshaping and amplitude division technology-based ultrahigh-speed optical imaging method. The optical imaging system comprises a femtosecond laser oscillator, an ultra-short sub pulse string generator, a femtosecond laser amplifier, an optical beam expanding system, an afocal optical system, a wavelength amplitude division optical system and a plurality of image recording systems. The optical imaging method comprises the following steps of: outputting a femtosecond laser pulse string; changing each pulse into a group of sub pulse string; amplifying each sub pulse; performing collimation and beam expansion on the amplified sub pulse; projecting the sub pulse subjected to the collimation and beam expansion to an object to be measured; propagating the sub pulse carrying object information of different moments along different directions; and receiving and recording the sub pulse of different directions. The system and the method can realize multi-image recording of dozens of picosecond to dozens of nano seconds process of picosecond time resolution.

Description

technical field

[0001] The invention relates to the technical field of ultrafast optics and transient imaging, in particular to an ultrahigh-speed optical imaging system and optical imaging method based on ultrashort pulse dispersion shaping and framing technology with picosecond or even femtosecond time resolution. Background technique

[0002] Extremely high-speed optical imaging technology has important applications in many fields, such as scientific research under extreme conditions such as extremely fast flyer technology, Z-Pinch explosive magnetic pinch and variable specific impulse magnetoplasma rocket. These transient optical processes have a flight velocity as high as 50-100 km / s, require a framing time of the order of 100 picoseconds, and need to obtain 10-20 high-time-resolution images within the critical process time of 5-10 nanoseconds , the corresponding photography frequency is required to reach 10 10 pps~10 11 pps (frame / second). In the existing technology...

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