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

An optical imaging system, optical system technology, applied in the field of ultrafast optics and transient imaging

Inactive Publication Date: 2011-02-16
SHENZHEN UNIV
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Problems solved by technology

Although ultrafast optical technology can obtain optical images with high time resolution, it is still a huge technical challe...

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

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0025] The present invention proposes an extremely high-speed optical imaging technology based on chirped pulse shaping and spatial dispersion technology, which utilizes the time shaping technology of ultrashort laser pulses to generate pulse sequences of different wavelengths with overlapping spatial transmission directions. The sub-pulse width of the sequence is on the order of picoseconds or even femtoseconds, and the pulse interval can be adjusted from tens of picoseconds to nanoseconds (depending on needs), so it can be used for picosecond time resolution of tens of picoseconds to several Multiple image recording of a ten-nanosecond process.

[0026] see figure 1 , the optical imaging system of the present invention includes a femt...

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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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Application Information

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IPC IPC(8): G02B27/09G03B39/00G02F1/39
Inventor 徐世祥陆小微陈红艺刘晋李景镇
Owner SHENZHEN UNIV
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