Device for generating multi-wavelength stimulated raman laser

Abstract

The invention discloses a device for generating multi-wavelength stimulated raman laser, which comprises an optical maser (1), and a focus lens (4), a raman pipe (5) and a collimation component (6) all arranged on an output laser path (2) of the optical maser, and is characterized in that a frequency multiplier (3) is arranged on the laser path between the optical maser (1) and the focus lens (4); mixed gas with air pressure ranging from 1.2 MPa to 3.4 MPa is filled into the raman pipe (5), and comprises deuterium gas, hydrogen and helium; the ratio of the deuterium gas, the hydrogen and the helium is (0.8-1.2) : (0.23-0.27) : (0.29-0.33); the focal distance of the focus lens (4) is from 30 cm to 60 cm; and the collimation component (6) comprises a concave lens (61) and a convex-concave lens (62) with the same optical axis, and the focal distance of the concave lens (61) is from minus 30 cm to 60 cm and the focal distance of the convex-concave lens (62) is from 20 cm to 30 cm. The device can not only directly provide wavelength pairs required by an ozone differential absorption lidar, but also can be independently used as a light emitting source of the lidar, and can emit multi-wavelength differential laser beams with the same laser beam at the same time.

Description

technical field [0001] The invention relates to a device for stimulating Raman light, in particular to a device for generating multi-wavelength stimulated Raman light. Background technique [0002] At present, in order to detect the spatial distribution profile of pollutant gases in the atmosphere, the method of differential absorption lidar is often used. The laser light source required by differential absorption lidar is usually limited by the laser medium, and its output wavelength is limited. In order to expand the output wavelength of the laser, people often use the stimulated Raman effect to generate a stimulated Raman laser with the same properties as the laser, as disclosed in the Chinese utility model patent specification CN 2684189Y published on March 9, 2005. A "Raman tube optical path device for vehicle-mounted pollution measurement lidar". The Raman tube optical device of the laser radar mentioned in this patent specification is composed of a Raman tube filled...

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Problems solved by technology

However, although this Raman tube optical path device has the advantages of both the length of the Raman tube and the short optical path of the Raman tube, it also has the disadvantage that the Raman tube is only filled with one kind of active gas, and the wavelength of the stimulated Raman laser generated is relatively short. However, it cannot provide the wavelength pair required by the ozone differential absorption lidar; although the Raman tube optical path device can be used together with other discrete beam generating devices to meet the wavelength pairs required by the ozone differential absorption lidar, but There is a problem that it is difficult to obtain multi-wavelength beams output by the same beam

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