An Ultrafast Imaging Device Based on Spectrum-Time Mapping

A technology of time-mapping and imaging devices, applied in measuring devices, optical radiometry, spectrometry/spectrophotometry/monochromators, etc., to achieve simple and easy-to-build effects

Active Publication Date: 2021-05-25
EAST CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the number of imaging frames depends on the number of sub-pulses, only 6 images can be taken

Method used

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  • An Ultrafast Imaging Device Based on Spectrum-Time Mapping
  • An Ultrafast Imaging Device Based on Spectrum-Time Mapping
  • An Ultrafast Imaging Device Based on Spectrum-Time Mapping

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Embodiment

[0038]This embodiment is observed for the ultra-fast dynamic process of femtosecond laser ablation silicon. Since femtosecond laser and material interaction, the extensive focus of scientists is caused by the application of scientists. Ultra-fast lasers can change the status and properties of the material, which can be used for high quality, high precision, and complex three-dimensional structures of almost any material. The process of femtosecond laser and material interaction, including electron excitation, electron-lattice heat conduction, material eruption, and removal, belongs to the ultra-fast process, time from femtosecond to nanoseconds. In order to understand and control these super fast dynamic processes, it is necessary to rely on ultra-fast observation technology. Here, the ultra-fast dynamic process of observing femtosecond laser ablation silicon in the present invention is taken as an example.

[0039]Seefigure 1 ,figure 2 This embodiment is completed by the present inven...

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PUM

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Abstract

The invention discloses an ultra-fast imaging device based on spectrum-time mapping, which comprises a detection light generating system and a spectrum imaging system connected by an optical path. Among them, the probing light generation system is composed of the first femtosecond laser, the first electric shutter, the first convex lens, the yttrium aluminum garnet crystal, the second convex lens, the pulse stretcher, the filter and the first plane mirror, which are sequentially connected by optical paths; the spectral imaging system It is composed of a sample, an objective lens, a beam splitter, a third convex lens and a hyperspectral camera connected by optical paths in sequence. The invention can directly observe the two-dimensional space and time three-dimensional information of ultra-fast dynamic scenes, and then be used to detect the spatio-temporal evolution of physical, chemical, and biological processes, and realize high-quality observation of nanosecond, picosecond or even femtosecond-level super Fast dynamic process. Compared with the STAMP device, the present invention is simple and easy to build, and does not need complicated pulse shaping systems and space separation systems.

Description

Technical field[0001]The present invention relates to the field of optical ultra-fast imaging, in particular a super fast imaging device based on spectral-time mapping.Background technique[0002]Optical imaging is an important tool for human exploration of natural mystery and technology development. At the same time, the space and time information of the ultra-fast dynamic scene is critical, which helps to study many important basic mechanisms in physics, chemistry, and biological disciplines. In traditional optical imaging, imaging speed depends primarily on detectors CCD or CMOS detection speed, usually in milliseconds - microseconds, unable to capture transient evolution events of femtosecond scale. The pump-detection method can provide a very high frame rate, but the dynamic scenario as required is repeatable. Therefore, the pump-detection method is not applicable for many non-repetitive or repeated ultra-fast events.[0003]In recent years, ultra-fast optical imaging of single exp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/28G01J3/12
CPCG01J3/12G01J3/2823G01J2003/1213
Inventor 姚佳丽姚云华何一林曹烽燕丁鹏鹏金诚挚齐大龙张诗按
Owner EAST CHINA NORMAL UNIV
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