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Discrete mirror multi-pass pool gas stimulated Raman scattering device

A technology of stimulated Raman scattering and gas, which is applied in the direction of laser scattering effect, lasers, electrical components, etc., can solve the problem of not being able to fully utilize the area of ​​the cavity surface, and is conducive to the generation of Raman light, convenient adjustment, and suppression The effect of the particle population depletion effect

Pending Publication Date: 2022-05-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

At present, the Herriott type multi-pass cell is one of the most widely used multi-pass cells, but this type of multi-pass cell can only form a circular or elliptical distribution on the lens cavity surface, and cannot make full use of the cavity surface area

Method used

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  • Discrete mirror multi-pass pool gas stimulated Raman scattering device

Examples

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Effect test

Embodiment 1

[0041] In this embodiment, a nanosecond pulsed Nd:YAG laser frequency-doubled light 532 nm laser is used as the pump laser, the pulse width is 10 ns, the polarization state is vertical polarization, the maximum output energy is 200 mJ, and the repetition frequency is 1 Hz. The pump light passes through a Raman cell 7 filled with CO2. The Raman cell 7 with a length of 1000mm is filled with 1MPa CO2; the polarization state of the incident light becomes circularly polarized by rotating λ / 4 slices 4 angles; the focusing lens 5 is an ordinary circular lens with a focal length of 500mm. It is composed of cylindrical mirrors with a focal length of 250mm; the number of optical paths in the Raman cell 7 is controlled to be 5 times by controlling the incident light angle and the tilt angle of the mirror. The device mainly converts the 532nm pump light into three Raman lasers of 574nm, 624nm and 683nm.

Embodiment 2

[0043] In this example, a picosecond pulsed Nd:YAG laser fundamental frequency 1064 nm laser is used as the pump laser, the pulse width is 100 ps, ​​the polarization state is vertical polarization, the repetition frequency is 100 Hz, and the incident laser radius is very small at this time. The 1064 nm pump light sequentially passes through the Raman cell 7 filled with H2. The Raman cell 7 with a length of 2000mm is filled with 1MPa H2 and 1MPa helium gas; the angle of λ / 4 slices is rotated to make the polarization state of the incident light to be horizontally polarized; It is 1000mm and the interval is 30mm; the two plano-concave mirrors are composed of the same aspherical discrete mirror, and the curvature radii in the x and y directions are 240mm and 260mm respectively; the Raman cell is controlled by controlling the incident light angle and the mirror tilt angle 7 The number of optical paths within 100 times. The device mainly converts the 1064nm pump light into 1.9μm, 9...

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Abstract

The invention provides a discrete mirror multi-pass pool gas stimulated Raman scattering device. The discrete mirror multi-pass pool gas stimulated Raman scattering device comprises a pump laser, and a lambda / 2 piece, a polarization splitting prism, a lambda / 4 piece, a Raman pool, a splitting prism and a separation baffle which are sequentially arranged along the laser output direction of the pump laser, a focusing lens and a laser reflector group are sequentially arranged in the Raman cell along the laser incident direction, the focusing lens converges incident laser to the central position of the Raman cell, and the laser reflector group is configured to be capable of adjusting the reflection times of the laser in the Raman cell; and the Raman cell is filled with Raman active gas. According to the invention, a multi-pass pool structure is designed, the design is simple, the debugging is convenient, the conversion rate of Raman light in gas is effectively improved, and the device can be widely applied to the field of laser frequency conversion.

Description

technical field [0001] The invention relates to the technical field of nonlinear laser frequency conversion, in particular, to a gas stimulated Raman scattering device in a discrete mirror multi-pass cell. Background technique [0002] 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 transformation, but the damage threshold of solids is often low, and the Raman frequency shift is relatively small, around 1000cm-1; while the gas Raman active medium has better optical uniformity and larger damage threshold, and the Raman shift is relatively large, such as the vibration mode Raman frequency shift of hydrogen is 4415cm-1, methane is 2917cm-1, and carbon dioxide is 1388cm-1. Therefore, the spectrum of gas stimulated Raman lasers often covers a wide range and the spectrum is more abundant. [0003] Multipass cell is an important means to change the output of stimulated Raman...

Claims

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Application Information

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IPC IPC(8): H01S3/081H01S3/10H01S3/101H01S3/30
CPCH01S3/305H01S3/101H01S3/10038H01S3/0811H01S3/10
Inventor 郑天成郭敬为蔡向龙刘金波沈陈诚李仲慧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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