CO2 cascade ultraviolet Raman laser

An ultraviolet Raman and laser technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of limiting the maximum observable range, limiting the maximum observable range, aerosol interference, etc., and breaking the maximum observable range. Constraints, convenient debugging, good directionality

Inactive Publication Date: 2021-01-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, using D 2 The resulting two wavelengths (289 and 316nm) are somewhat insufficient for measurements in the boundary layer, which are interfered by unwanted aerosols; for measurements in the upper troposphere, at N 2 The on-line wavelength (283nm) generated in is somewhat short, which may limit the maximum observable range due to strong ozone absorption
In both cases, relatively wide wavelength intervals lead to aerosol interference, and long off-line wavelengths may limit the maximum observable range due to background light during the day

Method used

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  • CO2 cascade ultraviolet Raman laser

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Effect test

Embodiment 1

[0029] A nanosecond-level pulsed Nd:YAG laser quadruples 266nm ultraviolet laser as the pump laser. The pulse width of the 266nm ultraviolet light is 10ns, the polarization state is vertical polarization, the highest output energy is 80mJ, and the repetition frequency is 1 Hz. 266nm pump light sequentially passed through two filled with CO2 The Raman pool I6 and the Raman pool II8. The Raman cell Ⅰ6 with a length of 80cm is filled with 0.1MPaCO 2 , the length is 180cm Raman cell Ⅱ 8 filled with 2MPa CO 2 ;Rotate λ / 4 sheet 4 angles to change the polarization state of incident light into circular polarization; the focal length of plano-convex lens Ⅰ5 and plano-convex lens Ⅲ9 is 1000mm; the focal length of plano-convex lens Ⅱ7 is 500mm; 276nm, 287nm, 299nm three Raman lasers.

Embodiment 2

[0031] A picosecond-level pulsed Nd:YAG laser quadruples 266nm ultraviolet laser as the pump laser. The pulse width of the 266nm ultraviolet light is 100ps, the polarization state is vertical polarization, and the repetition frequency is 100 Hz. 266nm pump light sequentially passed through two filled with CO 2 The Raman pool I6 and the Raman pool II8. The Raman cell Ⅰ6 with a length of 180cm is filled with 0.3MPaCO 2 and 0.1MPa helium, the length is 80cm Raman cell Ⅱ 8 filled with 7MPa CO 2 and 5MPa helium; rotate the λ / 4 plate by 4 angles to make the polarization state of the incident light horizontally polarized; the plano-convex lens I5 is replaced with a beam reducer that can reduce the laser beam by one time, and the focal length of the plano-convex lens II7 is 500mm. Lens; the focal length of the plano-convex lens III9 is ​​500mm; the device converts the 266nm fundamental frequency pump light into three Raman laser beams of 276nm, 287nm and 299nm.

Embodiment 3

[0033] A nanosecond-level pulsed Nd:YAG laser quadruples 266nm ultraviolet laser as the pump laser. The pulse width of the 266nm ultraviolet light is 5ns, the polarization state is vertical polarization, the highest output energy is 80mJ, and the repetition frequency is 10Hz. 266nm pump light sequentially passed through two filled with CO 2 The Raman pool I6 and the Raman pool II8. The Raman cell Ⅰ6 with a length of 100cm is filled with 0.1MPaCO 2 and 0.5MPa helium, the length is 180cm Raman cell Ⅱ 8 filled with 2MPa CO 2 and 1MPa helium; rotate the λ / 4 sheet by 4 angles to make the polarization state of the incident light elliptically polarized; replace the plano-convex lens Ⅰ5 with a beam expander that can double the spot size of the laser beam, and the focal length of the plano-convex lens Ⅱ7 is 1500mm Telephoto lens; plano-convex lens III9 with a focal length of 1500mm; the device mainly converts the 266nm fundamental frequency pump light into three Raman laser beams of ...

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Abstract

The invention provides a CO2 cascade ultraviolet Raman laser. High-purity CO2 gas is pumped by adopting quadruplicated frequency 266nm of an Nd: YAG laser, and three main ultraviolet light outputs of276nm, 287nm and 299nm are realized by utilizing cascade stimulated Raman scattering. By using double Raman pools, the energy output of Raman light of each order in the two Raman pools can be respectively regulated and controlled. Raman light output of different energy can be obtained by changing energy, pulse width, light beam quality and polarization state of incident pump light, pressure of CO2gas in the two Raman pools, focusing parameters and lengths of the Raman pools or filling buffer gas in the Raman pools and controlling types and pressure of the buffer gas. The laser has the advantages that the laser is simple in design and convenient to debug, simultaneous output of two atmospheric window pairs (276 nm/287 nm and 287 nm/299 nm) can be achieved, and the energy output values of the three beams of light can be regulated and controlled.

Description

technical field [0001] The invention belongs to the field of nonlinear laser frequency conversion, and relates to a CO 2 The cascaded Raman laser specifically relates to a multi-beam ultraviolet laser output device based on stimulated Raman scattering of carbon dioxide gas. Background technique [0002] More and more fields such as space monitoring, atmospheric detection, environmental monitoring, and weather forecasting require lidar technology, and testing methods such as differential absorption and double differential absorption have been developed. While improving the measurement accuracy, there are more requirements for the wavelength of the laser. Stimulated Raman scattering technology combined with solid-state laser can obtain a combination of various laser wavelengths. [0003] Multispectral-based differential absorption lidar systems have been widely used in atmospheric exploration related to ozone intrusion in the lower stratosphere and for detecting changes in b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/30
CPCH01S3/305
Inventor 郑天成郭敬为蔡向龙沈陈诚李仲慧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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