Femtosecond heterodyne optical Kerr gate and imaging device and method based on optical Kerr gate

An imaging device and optical Kerr technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of blurred image edges, affect imaging quality, and reduce system imaging resolution, and achieve sharp imaging edges and high system resolution. , sharp edge effect

Active Publication Date: 2014-04-16
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this low-pass filtering effect also leads to blurred image edges in traditional optical Kerr gate i

Method used

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  • Femtosecond heterodyne optical Kerr gate and imaging device and method based on optical Kerr gate
  • Femtosecond heterodyne optical Kerr gate and imaging device and method based on optical Kerr gate
  • Femtosecond heterodyne optical Kerr gate and imaging device and method based on optical Kerr gate

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Example Embodiment

[0062] Example 1

[0063] In this embodiment, the identification rate board exposed to the air (the American military standard 1951 USAF resolution board, which conforms to the American MIL-STD-150A standard) is used as the sample to be tested. The pattern on the identification rate board consists of several groups of three short lines. The size of the short lines ranges from large to small. This test chart is widely used to test the resolution capability of optical imaging systems (such as microscopes and cameras). figure 2 To directly use the digital camera to take images of this resolution board. The specific implementation steps are as follows:

[0064] (1) The single pulse energy emitted from the femtosecond laser is 3mJ, the pulse width is 50fs, the repetition frequency is 1kHz, and the horizontal polarization of the femtosecond pulse laser is limited by an aperture of about 4mm, and the splitting ratio is 2 The beam splitter of :8 is divided into two beams, of which one be...

Example Embodiment

[0070] Example 2

[0071] In this embodiment, the identification rate board hidden in the polystyrene microsphere suspension is used as the sample to be tested to simulate the ability of the present invention to image hidden objects in a large number of scattering environments. The identification rate board is the same as that described in Example 1. The specific implementation steps are as follows:

[0072] (1) A small amount of polystyrene microspheres with a particle size of 15 microns are mixed into deionized water to prepare a polystyrene microsphere suspension. The suspension is a commonly used standard scattering medium. By adjusting the concentration of polystyrene microspheres, a strong scatterer with an optical density of 10 is obtained. The identification rate board is placed in front of the scattering medium to form the sample to be tested in this example.

[0073] (2) A femtosecond pulse laser with a single pulse energy of 3mJ, a pulse width of 50fs, a repetition fre...

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Abstract

The invention provides a femtosecond heterodyne optical Kerr gate and an imaging device and method based on the optical Kerr gate. A target to be detected, the femtosecond heterodyne optical Kerr gate and a CCD are sequentially arranged on a detection light path of the imaging device, wherein the femtosecond heterodyne optical Kerr gate is composed of a polarizer, an optical Kerr medium and an analyzer, and the heterodyne angle between the polarization direction of the analyzer and the polarization perpendicular direction of a detection pulse ranges from 3 degrees to 5 degrees. An optical delay line and a half wave plate are sequentially arranged on a switch light path, and a switching pulse and the detection pulse coincide inside the Kerr medium. The imaging method includes the steps of dividing a femtosecond pulse into two paths, enabling the detection pulse to enter a sample to be detected and enter the femtosecond heterodyne optical Kerr gate after being reflected and transmitted, opening the femtosecond heterodyne optical Kerr gate through the switching pulse, instantly gating components carrying sample morphology information in the detection pulse, enabling the gated detection pulse to enter the CCD, and obtaining a morphology image of the sample to be detected, wherein the morphology image has ultrahigh time resolution. The femtosecond heterodyne optical Kerr gate and the imaging device and method have the advantages of being simple in light path and extremely short in gating time, enabling the imaging space resolution to be close to the system diffraction limit, and the like.

Description

technical field [0001] The invention belongs to the technical field of ultra-fast imaging and measurement, and relates to a femtosecond heterodyne optical Kerr gate and an imaging device and method based on the optical Kerr gate. Background technique [0002] The development of ultra-fast imaging and measurement technology has important application value in the research fields of high-speed collision, detonation process, high-voltage discharge, visual mechanism and other transient processes. Generally, high time-resolved imaging from milliseconds to sub-picoseconds can be achieved by using photoelectric technology. Using ultra-fast imaging technology based on photonic technology, such as femtosecond holographic imaging and nonlinear optical gate imaging technology. [0003] Optical Kerr gate imaging technology is a typical nonlinear optical gate imaging technology. This imaging technology uses the optical shutter constructed by the optical Kerr effect, which is usually cal...

Claims

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Application Information

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IPC IPC(8): G02F1/35G03B39/00
Inventor 谭文疆司金海占平平许士超陈烽侯洵
Owner XI AN JIAOTONG UNIV
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