Wide spectrum self-calibration absolute spectrum radiometer based on spontaneous parametric down-conversion

A parametric down-conversion, spectroradiometer technology, applied in the field of wide-spectrum self-calibration absolute spectroradiometer, can solve the problems of complicated process, insufficient practicality, limited number of effective channels, etc., to improve the level of signal-to-noise ratio and improve the observation The effect of precision

Active Publication Date: 2018-08-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

The above method not only obtains a limited number of effective channels, but also has a complicated process, so it is more limited to experimental research, and there are deficiencies in practical application

Method used

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  • Wide spectrum self-calibration absolute spectrum radiometer based on spontaneous parametric down-conversion
  • Wide spectrum self-calibration absolute spectrum radiometer based on spontaneous parametric down-conversion

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Embodiment Construction

[0023] The specific implementation of the broadband self-calibration absolute spectroradiometer based on spontaneous parameter down-conversion can be found in figure 1 As shown, it includes a correlated photon source module 100, a rotating scanning mirror 200, an afocal telescope optical path module 300, a dichroic mirror 400, a dual-channel pump light suppression optical path module 500, a signal light collection optical path module 600, and an idle light collection module. An optical path module 700, a two-way combiner 800 and a control computer 900.

[0024] (1) Working method of self-calibration mode

[0025] In self-calibration mode, refer to figure 1, the mirror surface of the rotating scanning mirror 200 is flipped to the side facing the relevant photon source module 100, and the relevant photon calibration source is introduced into the subsequent optical path. The correlated photon source module consists of a pump laser 101, a polarizer 102, a half-wave plate 103, a ...

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Abstract

The invention discloses a wide spectrum self-calibration absolute spectrum radiometer based on spontaneous parametric down-conversion. The wide spectrum self-calibration absolute spectrum radiometer comprises a correlated photon source module, a rotating scanning reflecting mirror, a no-focus telescope light path module, a dichroscope, a double-channel pump light suppression light path module, a signal light acquisition light path module, a free light acquisition light path module, a double-path conforming device and a control computer. The correlated photon source module provides "no-tracing"calibration based on the I-class spontaneous parametric down-conversion effect. The rotating scanning reflecting mirror is clockwise rotated for 90 degrees to realize switching of the self-calibration function and the target radiation information observation function, and the self-calibration absolute spectrum radiometer is realized according to the design concept. The self-calibration absolute spectrum radiometer has important application prospect in light radiation measurement and light radiation measurement standard transmission.

Description

technical field [0001] The invention relates to the technical fields of optical radiation measurement, optical radiation calibration and optical metrology, in particular to a wide-band self-calibrating absolute spectroradiometer based on spontaneous parameter down-conversion. Background technique [0002] Spontaneous parametric down-conversion refers to a physical phenomenon that occurs after a monochromatic pump photon flow pumps a nonlinear crystal. The incident photon splits into twin photon pairs with a certain probability, and the frequency of the two photons of the down-converted twin photon pair and the pump light follow the relationship of energy conservation, and the wave vectors of the three satisfy the relationship of momentum conservation. The momentum conservation and energy conservation relations constitute the phase matching conditions between the pump light and the nonlinear crystal in spontaneous parametric downconversion. By designing and satisfying certai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/28G01J3/02
CPCG01J3/02G01J3/28
Inventor 翟文超郑小兵李健军夏茂鹏高冬阳胡友勃白米粒汤琪张权闫静
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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