Hollow-glass-tube-based gas stimulated Raman amplifier with seed lasers

Abstract

The invention provides a hollow-glass-tube-based gas stimulated Raman amplifier with seed lasers. The hollow-glass-tube-based gas stimulated Raman amplifier comprises a pumping laser device, a laser splitting system, a first Raman cell, a second Raman cell, a hollow glass tube and a set of laser splitting prisms. A pumping laser source is split by the laser splitting system into two pumping laser beams. The first pumping laser beam is guided into the first Raman cell through a first double-phase colored mirror to generate the backward Raman seed lasers; after laser path delaying is carried out, the second pumping laser beam and the backward Raman seed lasers reach a second double-phase colored mirror at the same time to be combined and then jointly guided into the hollow glass tube arranged in the second Raman cell in a grazing incidence mode for stimulated Raman amplification, and finally single amplified Raman lasers are obtained through laser splitting of the set of laser splitting prisms. The experimental result shows that compared with a traditional dual-cascade Raman cell, the hollow-glass-tube-based gas stimulated Raman amplifier has the advantage that the stimulated amplified Raman lasers higher in conversion efficiency can be obtained. The hollow-glass-tube-based gas stimulated Raman amplifier can be widely applied to the fields such as military science, medical treatment and environment monitoring.

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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