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Method and device for detecting laser wavelength based on Rayleigh Brillouin scattering

A technology of laser wavelength and Brillouin frequency shift, which is applied in the field of laser spectroscopy to achieve the effect of broadening the measurable band range, improving signal strength and reducing requirements

Active Publication Date: 2018-05-08
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional wavelength meter can only realize the measurement of the wavelength of a certain band range. Different wavelength meters are required to measure the laser wavelength of different bands, and it is impossible to use a set of devices to realize the wavelength measurement of the whole band from ultraviolet to infrared.

Method used

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  • Method and device for detecting laser wavelength based on Rayleigh Brillouin scattering
  • Method and device for detecting laser wavelength based on Rayleigh Brillouin scattering
  • Method and device for detecting laser wavelength based on Rayleigh Brillouin scattering

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Embodiment Construction

[0014] as attached figure 1 As shown, the device includes a laser light source (1) of the wavelength to be measured, a digital pressure gauge (2), a mirror (3), a visible light laser (4) used to calibrate the optical path, convex lenses (5, 9, 10, 12, 13, 15, 23), scattering cell (6), extinction device (7), aperture (8), pinhole filter (11), F-P scanning interferometer array (14), fiber coupler (16), detection device (17), data acquisition card (18), temperature control system (19), F-P scanning controller (20), oscilloscope (21), computer (22); before measuring the laser light source (1) to be tested, first The visible light emitted by the laser (4) is reflected by the reflector (3) and focused by the convex lens (5) on the center of the scattering pool, and then the measurement optical path is adjusted and the instrument is calibrated. After completion, the laser (4) is turned off; the laser light source to be measured (1 ) the laser light emitted by the convex lens (23) is...

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Abstract

The invention discloses a method and a device for detecting laser wavelength based on Rayleigh Brillouin scattering. The Rayleigh Brillouin scattering spectrum in a certain scattering direction is obtained by measuring a Rayleigh Brillouin scattering signal produced by the interaction between laser of which the wavelength is to be detected and high-pressure gas, and the wavelength of the laser tobe detected is obtained according to the frequency shift of the Brillouin peak. Wavelength detection of laser from ultraviolet to infrared can be realized by using one set of device. Moreover, the device can control the temperature and pressure of gas in a scattering pool according to whether the wavelength to be detected is in the ultraviolet, visible light or infrared band to optimize the measurement of spectral Brillouin frequency shift and signal intensity. The signal intensity and spectral resolution can be improved, and it can be ensured that the detection result is highly accurate. . The invention mainly describes a device for realizing laser wavelength detection by using spontaneous Rayleigh Brillouin scattering.

Description

technical field [0001] The invention relates to a method and device for detecting laser wavelength based on Rayleigh Brillouin scattering, belonging to the technical field of laser spectroscopy. Background technique [0002] Since the laser has the advantages of good monochromaticity, good directionality, good coherence, and energy concentration, since the invention of the laser in 1960, laser technology has developed rapidly and has been widely used in industry, medicine, commerce, scientific research, information, and military affairs. field has been widely used. Lasers with different wavelengths are suitable for different occasions. For example, in medical applications, monochromatic red light with a wavelength of 694.3nm is mainly used to treat ophthalmic diseases, and monochromatic long-wave ultraviolet light with a wavelength of 337.1nm is mainly used to treat inflammation. The near-infrared light of 1064nm is mainly used for surgical resection of cancerous tumors and...

Claims

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Application Information

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IPC IPC(8): G01J9/02
CPCG01J9/0246
Inventor 何兴道商景诚吴涛
Owner NANCHANG HANGKONG UNIVERSITY
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