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A high relative aperture and large field of view imaging objective lens in the terahertz band

An imaging objective lens and relative aperture technology, applied in the direction of instruments, optics, optical components, etc., can solve the problems of difficult to obtain high-quality imaging results, lack of design optimization process, etc., to improve the total transmittance and reduce the number of lenses , the effect of loose machining and assembly tolerances

Active Publication Date: 2019-06-07
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the terahertz band high relative aperture and large field of view imaging objective lens for security imaging is blank, and no mature products have yet been introduced to the market
Some research institutions simply combine multiple single lenses to form an imaging objective lens. Due to the lack of a complete design optimization process, it is difficult to obtain high-quality imaging results

Method used

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  • A high relative aperture and large field of view imaging objective lens in the terahertz band
  • A high relative aperture and large field of view imaging objective lens in the terahertz band
  • A high relative aperture and large field of view imaging objective lens in the terahertz band

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A terahertz band high relative aperture large field of view imaging objective lens, which includes a terahertz filter, a first lens, a diaphragm, a second lens, a terahertz filter, a first lens, a diaphragm, a second lens and The image planes are arranged sequentially from left to right on the optical axis of the system. Both the first lens and the second lens are convex lenses, and the refractive powers of the first lens and the second lens are both positive. In addition, the materials of the first lens and the second lens have an absorption coefficient lower than 0.5 cm in the band below 0.5 THz -1 plastic, and the refractive index of the material of the first lens and the second lens is 1.3 to 2.

Embodiment 2

[0032] On the basis of Embodiment 1, the material of the first lens is polytetrafluoroethylene, high-density polyethylene, polypropylene or Tsurupica, and the material of the second lens is polytetrafluoroethylene, high-density polyethylene, polypropylene or Tsurupica; and the material of the first lens may be the same as that of the second lens, or may be different.

Embodiment 3

[0034] On the basis of Embodiment 1 or Embodiment 2, the terahertz filter is a flat material with parallel ends, and the terahertz transmittance of the terahertz filter is >80%, and the thickness is <5 mm.

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Abstract

The invention discloses a terahertz band imaging objective lens with a high relative aperture and a large field of view, and belongs to the technical field of optical lens imaging. The object of the invention is to provide a terahertz band imaging objective lens with a high relative aperture and a large field of view, to realize the high relative aperture and large imaging field of view. The terahertz band imaging objective lens comprises a terahertz filter, a first lens, a diaphragm and a second lens. The first lens and the second lens are both convex lenses and both have positive focal power. The first lens and the second lens are both made of plastics having an absorption coefficient of less than 0.5 cm-1 in a less than 0.5THz band and a refractive index 1.3 to 2. Both the first lens and the second lens have high-order aspheric surfaces as the front surfaces, the image quality of the whole field of view is well corrected, and the high relative aperture and large imaging field of view are realized. The invention is applicable to an objective lens for terahertz imaging.

Description

technical field [0001] The invention belongs to the technical field of optical lens imaging, and relates to an imaging objective lens with high relative aperture and large field of view in the terahertz band. Background technique [0002] Terahertz (Terahertz, abbreviated as THz, 1THz=10 12 Hz) generally refers to electromagnetic waves with frequencies in the 0.1-10THz band, located between infrared and microwave, and in the transition stage from macroelectronics to microphotonics. Because this band has important characteristics such as wide spectrum, narrow pulse width, coherence, low energy, perspective, fear of water, fingerprint absorption spectrum, etc. , terahertz technology plays an increasingly important role. [0003] In the field of human security inspection, terahertz waves have high penetrability and can detect dangerous and prohibited items hidden in clothing without causing ionizing radiation hazards to the human body. Therefore, the use of terahertz waves f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/06G02B13/18G02B1/04
CPCG02B1/041G02B13/003G02B13/06G02B13/18
Inventor 李磊李赜宇罗振飞李光彬王度孔维鹏秦瑀严强周逊
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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