Carbon dioxide thulium-doped all-optical-fiber annular laser detection method and laser unit

Abstract

The invention relates to the technical field of optical fiber lasers and optical fiber sensors and provides a carbon dioxide thulium-doped all-optical-fiber annular laser detection method and a laser unit which aim at achieving continuous Q-switched and mode-locked output of high-power lasers and detecting the concentration of carbon dioxide (CO2) gas. According to the technical scheme, a pumping source is coupled into a thulium-doped double-clad optical fiber through a pumping arm of a beam combiner and output to a pumping stripper; fluorescent light output by the pumping stripper is coupled into a perforated photonic crystal optical fiber through an optical fiber isolator and a first coupler; the output end of the perforated photonic crystal optical fiber is coupled to a passive optical fiber and a polarization controller in a welding mode; the output end of the polarization controller is sequentially welded to an adjustable broadband filter and an adjustable F-P filter, and the output end of the adjustable F-P filter is welded to a signal arm of the beam combiner; continuous Q-switched and mode-locked output of lasers generated by an annular laser cavity is achieved through a second coupler. The carbon dioxide thulium-doped all-optical-fiber annular laser detection method and the laser unit are mainly applied to design and manufacturing of optical fiber lasers and optical fiber sensors.

Description

technical field [0001] The invention relates to the technical field of optical fiber lasers and optical fiber sensing, in particular to a carbon dioxide-doped thulium-doped all-fiber ring laser detection method and a laser. Background technique [0002] The 2μm band laser has the characteristics of weak atmospheric absorption, small scattering, and safety to human eyes. It has important application prospects in material processing, remote sensing detection, laser ranging, and gas sensing. It is also used for nonlinear optical frequency conversion. An important pump source of coherent radiation in infrared to THz bands, especially a high-power laser source, has special advantages in practical applications and is a research hotspot in the field of laser technology. So far, there are few reports on 2 μm thulium-doped fiber lasers using gas as a saturable absorber. The main reason is that it is difficult to select a suitable gas cell. Photonic crystal fiber, a new type of optic...

AI Technical Summary

Problems solved by technology

So far, there are few reports on 2 μm thulium-doped fiber lasers using gas as a saturable absorber. The main reason is that it is difficult to select a suitable gas chamber.

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