A gas-stimulated Raman amplifier based on a hollow glass tube with its own seed light

Abstract

The invention provides a gas-stimulated Raman amplifier based on a hollow glass tube with Raman seed light, including a pump laser, a spectroscopic system, a first Raman cell, and a second Raman cell , a hollow glass tube and a group of optical prisms. The pumping light source is divided into two beams of pumping light through the beam splitting system, wherein the first beam of pumping light is introduced into the first Raman cell through the first dichroic mirror to generate backward Raman seed light; the second beam of pumping light passes through the optical path The delayed Raman seed light and the backward Raman seed light arrive at the second dichroic mirror at the same time and are combined, and then they are introduced into the hollow glass tube placed in the second Raman cell in the form of grazing incidence together for stimulated Raman amplification. Finally, a single amplified Raman light is obtained by combining the light through a dichroic prism. Experimental results show that, compared with the traditional double cascaded Raman cell, the invention can obtain stimulated amplified Raman light with higher conversion efficiency. The invention can be widely used in the fields of military affairs, medical treatment, environment monitoring and the like.

Description

technical field [0001] The invention relates to a stimulated Raman amplifier, in particular to a gas stimulated Raman amplifier based on a hollow glass tube with Raman seed light. Background technique [0002] In recent years, with the continuous development of lasers in many application fields such as transportation, measurement, medical treatment, national defense and industry and agriculture, the development of special laser wavelengths has attracted more and more attention. These special laser wavelengths can be generated by new laser working substances, or by nonlinear optical frequency conversion of gases or optical materials (such as crystals, etc.). In the field of nonlinear optics, stimulated Raman scattering can be used to convert the laser emission wavelength to a specific frequency (depending on the Raman vibration / rotational mode frequency of the Raman medium) to achieve a specific laser wavelength output. Therefore, stimulated Raman scattering technology is an...

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Problems solved by technology

In this way, the technical problem of high gas stimulated Raman scattering threshold is solved, and the effective interaction area between the pump light and the Raman seed light is also enlarged, but the pump light power density far away from the focal point drops rapidly , it is difficult to continue the stimulated Raman amplification process, that is, the effective interaction area is still limited, so it is still difficult to obtain a high Raman conversion efficiency

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