Method for measuring nonlinear absorption curve of material

A nonlinear absorption and curve technology, used in measurement devices, analytical materials, transmittance measurement, etc., can solve the problems of difficult response of energy meters, limit the measurement range of nonlinear absorption curves, increase the complexity of measurement devices, etc., and achieve high precision. The effect of nonlinear absorption curve measurement, improving the measurement range and improving the measurement accuracy

Active Publication Date: 2016-12-21
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Abstract
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  • Application Information

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Problems solved by technology

When measuring the nonlinear absorption curve of a material, a spectroscopic plate is usually used to obtain a small proportion of incident laser light and an energy meter is used for detection. The energy meter has a certain response threshold, and it is difficult for the energy meter to respond when a low-energy laser is incident, which limits the nonlinear absorption. The measurement range of the curve, and the incident laser spot size needs to be measured separately, which increases the complexity of the measurement device

Method used

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  • Method for measuring nonlinear absorption curve of material

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Experimental program
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Effect test

Embodiment 1

[0070] The gain medium of the pulse laser is Nd:YLF, and the output fundamental frequency light ω 1 =1053 nm, pulse width τ=50 ps, ​​fundamental frequency spot diameter 0.7cm, horizontal polarization of outgoing laser; crystal frequency doubling system consists of KDP and DKDP crystals, obtained after frequency conversion ω 2 = 263 nm quadruple frequency light; both the dispersion prism and the telephoto lens are ultraviolet high-transmittance components, and the focal length f of the telephoto lens is about 130cm; the material of the beam splitter is fused silica, and the reflectivity is 4%; the sample to be tested is The DKDP crystal with a deuterium content of 66%, the sample thickness h is 0.8 cm, and the sample surface is finely polished; the resolution of the scientific grade CCD camera is 1024 pixels × 1024 pixels, and the size of a single pixel is 13 μm × 13 μm; the attenuation film is Four-fold frequency laser attenuator; the measuring range of the energy meter is...

Embodiment 2

[0084] The implementation of this embodiment is basically the same as that of Embodiment 1, the main difference is that the crystal frequency doubling system is two KDP crystals, which generate ω 2 =351 nm frequency tripled light; the focal length of the telephoto lens is about 140 cm, the distance between the photosensitive surface of the scientific grade CCD camera and the sample to be tested is 104 cm; the attenuation film is a triple frequency laser attenuation film, scientific grade CCD The maximum grayscale of the flare on the camera is 87% of its saturated grayscale. The results show that the transmittance of DKDP crystals decreases nonlinearly with the increase of laser intensity, and compared with the results in Example 1, the nonlinear absorption of DKDP crystals under 351 nm laser irradiation decreases significantly.

Embodiment 3

[0086] The implementation of this embodiment is basically the same as that of Embodiment 1, the main difference is that the gain medium of the pulsed laser is Nd:YAG, and the output fundamental frequency light ω 1 =1064 nm; the crystal frequency doubling system is KDP and DKDP crystals, and the cutting angles of KDP and DKDP crystals are generated for 1064 nm laser ω 2 = 266 nm quadrupled light.

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Abstract

The invention discloses a method for measuring the nonlinear absorption curve of a material. The method comprises the following steps: obtaining required single-wavelength laser by adopting a crystal frequency multiplication system and a dispersing prism, improving the intensity of incident laser through a long focal length lens, recording the energy and the incident laser and the dimension of light spots through adopting a scientific grade CCD camera, and measuring the energy of emergent laser through an energy meter to obtain the nonlinear absorption curve of a sample to be measured. The method for measuring the nonlinear absorption curve of the material improves the measuring range of the nonlinear absorption curve, simplifies a nonlinear absorption curve measuring system, and realizes multi-wavelength, wide-range and high-precision measurement of the nonlinear absorption curve.

Description

technical field [0001] The invention belongs to the field of interaction between strong laser and matter, and in particular relates to a method for measuring the nonlinear absorption curve of a material. Background technique [0002] When light passes through the material, the light interacts with the atoms and electrons in the material to cause light absorption; the absorption coefficient of the material is constant under weak light conditions, and the absorption at this time is linear absorption; the absorption of the material when strong light is irradiated As the laser intensity changes, it shows nonlinear absorption characteristics: the phenomenon that the absorption coefficient decreases with the increase of the incident light intensity is called saturated absorption; the absorption coefficient increases with the increase of the incident light intensity is called anti-saturated absorption. The nonlinear absorption of materials plays an important role in strong lasers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/59G01N21/01
CPCG01N21/01G01N21/59G01N2021/0112G01N2201/068
Inventor 柴向旭李富全朱启华冯斌冯曦王芳敬域堃王礼权向勇韩伟李恪宇
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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