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Gas stimulated Raman scattering device based on astigmatic lens focusing

A technology of lens and astigmatism, which is applied in the field of gas stimulated Raman scattering devices, can solve the problems of reduced Raman conversion efficiency, which is not conducive to improving the quality of Raman light converted into Raman light beams, and achieves convenient debugging and variable wavelength Rich, easy-to-install effects

Pending Publication Date: 2021-12-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, when pumped with high energy, the laser will break down the gas, and the generated plasma tends to absorb a large number of pump photons, resulting in a decrease in Raman conversion efficiency. At the same time, it is accompanied by a strong thermal effect, which is not conducive to improving Raman light conversion and improving Raman. beam quality of light

Method used

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  • Gas stimulated Raman scattering device based on astigmatic lens focusing

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Embodiment 1

[0020] A nanosecond-level pulsed Nd:YAG laser frequency-doubled 532nm laser is used as the pump laser with a pulse width of 10ns, a vertical polarization state, a maximum output energy of 200mJ, and a repetition rate of 1 Hz. The pump light passes through the filled CO 2 The Raman pool6. The Raman cell 6 with a length of 80cm is filled with 1MPa CO 2 ; Rotate the λ / 4 wave plate 4 angles to make the polarization state of the incident light into circular polarization; the focal length of the astigmatic lens 5 is 500 mm, and the distance between the two cylindrical mirrors is 2 cm; the pump light is focused on the center of the Raman cell 6 . The device mainly converts 532nm pump light into three Raman laser beams of 574nm, 624nm and 683nm.

Embodiment 2

[0022] A picosecond-level pulsed Nd:YAG laser with a fundamental frequency of 1064 nm was used as the pump laser with a pulse width of 100 ps, ​​a vertical polarization state, and a repetition rate of 100 Hz. 266nm pump light sequentially passed through filled with H 2 The Raman pool6. A Raman cell 6 with a length of 180cm is filled with 1MPa H 2 and 0.1MPa helium; rotate the λ / wave plate 4 angles to make the polarization state of the incident light horizontally polarized; the focal length of the astigmatic lens 5 is 1000mm, and the distance between the two cylindrical mirrors is 4cm; the pump light is focused on the Raman 1 / 4 of pool 6. The device mainly converts 1064nm pump light into three Raman laser beams of 738nm, 1907nm and 9187nm.

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Abstract

The invention discloses a gas stimulated Raman scattering device based on astigmatic lens focusing. High-energy laser is focused through an astigmatic lens, a gas Raman medium is pumped to generate a stimulated Raman effect, and output of multiple spectral lines covering a wide spectral range is achieved. The astigmatic lens formed by orthogonally combining two plano-convex cylindrical mirrors is selected for focusing, the light intensity distribution at a focusing light spot can be changed by adjusting the distance between the cylindrical mirrors, and the laser-induced breakdown threshold value of gas can be changed, so that the energy output between all orders of Raman light is influenced. Disclosed by the invention is an effective multi-spectral-line output method which has the advantages that the laser is simple in design and convenient to debug, frequency conversion of various types of lasers can be achieved, the wavelength conversion span is large, and variable wavelengths are rich.

Description

technical field [0001] The invention is a gas stimulated Raman scattering device based on astigmatism lens focusing. The gas Raman medium is pumped by a high-energy laser to generate a stimulated Raman scattering effect and realize output of multiple spectral lines covering a wide spectral range. [0002] technical background [0003] Stimulated Raman is an effective method to broaden the spectral range of high peak power lasers. Both gas and solid media can be used for stimulated Raman conversion. Solid Raman active media often have the advantages of high gain coefficient, small volume, etc., and their damage threshold is low, and the Raman frequency shift is relatively small. -1 Correspondingly, the gas Raman active medium has the characteristics of low Raman gain coefficient and large damage threshold, and its Raman shift is relatively large, and the Raman frequency shift of the vibration mode of common Raman active gases such as hydrogen 4415cm -1 , methane is 2917cm -...

Claims

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Application Information

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IPC IPC(8): H01S3/104H01S3/30H01S3/10H01S3/102
CPCH01S3/305H01S3/1022H01S3/104H01S3/10
Inventor 郑天成蔡向龙郭敬为李仲慧沈陈诚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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