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Device and method for measuring non-linear refractive index coefficients of inert gasses

An inert gas, measuring device technology, applied in the measurement of phase influence characteristics, color/spectral characteristics, etc., can solve the problems of complex experimental equipment, high requirements for process control and measurement, and cumbersome data analysis methods. Easy to implement and simple experimental setup

Inactive Publication Date: 2011-08-17
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Although some of these methods can provide accurate measurements, their experimental setups are very complex, the requirements for process control and measurement are high, and the data analysis methods are also cumbersome.

Method used

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  • Device and method for measuring non-linear refractive index coefficients of inert gasses
  • Device and method for measuring non-linear refractive index coefficients of inert gasses
  • Device and method for measuring non-linear refractive index coefficients of inert gasses

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Embodiment Construction

[0032] Such as figure 1 : The focal length of the coupling lens (1) depends on the best match between the size of the incident femtosecond laser beam and the inner diameter of the hollow waveguide in the inert gas tube (2). For hollow-core fibers, the best matching condition is 1 / e of the intensity of the focal spot of the beam 2 The radius is 0.65 times the inner radius of the hollow fiber, at this time the beam is coupled to the fundamental mode EH of the hollow fiber11 The energy ratio of the mode is the largest, which is 0.98. The light beam is scattered by the scattering screen (3) after passing through the hollow fiber, and the spectrum of the scattered light is measured by the spectrometer (4). (5) is a vacuum pump, which is used to extract the gas in the inert gas pipe (2). The inert gas bottle (6) is used to adjust the inert gas pressure in the inert gas pipe (2), and the barometer (7) is used to measure the inert gas pressure in (2).

[0033] The theoretical basis...

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Abstract

The invention provides a device and a method for measuring non-linear refractive index coefficients of inert gasses, wherein the principle is to obtain the non-linear refractive index coefficients of the inert gas to be measured at a specific centre frequency through data analysis by measuring the change of the non-liner spectrum widening, accumulated when femtosecond laser pulses at the specific centre frequency are spread in a hollow waveguide filled with the inert gas, along with the pressure of the inert gas. The device comprises a focusing lens, an inert gas tube internally provided with a hollow optical fiber, a diffuser screen and a spectrograph, which are respectively located on an optical path where the femtosecond laser pulses travel, and a gas pressure gauge, an inert gas bottle and a vacuum pump all connected to the inert gas tube.

Description

technical field [0001] The invention relates to an inert gas, in particular to a device and method for measuring the nonlinear refractive index coefficient of the inert gas. Background technique [0002] With the development of chirped pulse amplification (CPA) technology and optical parametric chirped pulse amplification (OPCPA) technology, modern large-scale laser systems can emit petawatts (10 15 watts) of super-intensive laser beams. The propagation of high-intensity laser beams is significantly affected by nonlinear optical effects. In experiments and laser systems involving the propagation of high-intensity laser beams and interactions with gaseous media, accurate knowledge of the nonlinear refractive index n of the media 2 very important. Specifically, the beam emitted by a high-power laser system needs to be carefully designed to avoid n 2 Related effects such as self-phase modulation and self-focusing. In addition, many applications of modern laser technology a...

Claims

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Application Information

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IPC IPC(8): G01N21/41G01N21/25
Inventor 王丁冷雨欣徐至展
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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