Dual-wavelength pumping all-fiber 4.3[mu]m waveband carbon dioxide laser

Abstract

The invention discloses a dual-wavelength pumping all-fiber 4.3[mu]m waveband carbon dioxide laser, which is characterized in that the output ends of two pumping sources are respectively welded with two sections of solid-core optical fibers, and the other ends of the two sections of solid-core optical fibers are respectively welded with two input arms of an optical fiber beam combiner; the input end of an anti-resonance hollow-core optical fiber is sealed in a sealed gas cavity, and the tapered output tail fiber of the optical fiber beam combiner is in coupling connection with the input end ofthe anti-resonance hollow-core optical fiber; the sealed gas cavity is connected with a vacuumizing and inflating system, and the vacuumizing and inflating system is used for vacuumizing the sealed gas cavity and inflating CO2 gas and buffer gas with certain air pressure into a fiber core of the anti-resonance hollow-core optical fiber; and the output end of the anti-resonance hollow-core opticalfiber is welded with an intermediate infrared crystal end cap. According to the invention, through the characteristic that stimulated radiation transition of CO2 gas molecules can be pumped by two pieces of laser with different wavelengths to generate laser radiation with the same wavelength, the dual-wavelength pumping optical fiber gas laser is realized, and the utilization rate of the gas molecules and the output power level of the system are increased.

Description

technical field [0001] The invention belongs to the field of optical fiber laser technology, and in particular relates to a dual-wavelength pumped mid-infrared narrow-linewidth all-fiber gas laser. Background technique [0002] Mid-infrared lasers are highly concerned by scientists because of their wide application in military and civilian fields. At present, the means of producing mid-infrared laser mainly include solid-state lasers, quantum cascade lasers, supercontinuum lasers, gas lasers, fiber lasers, etc. Quantum cascade lasers have a wide output bandwidth and can be miniaturized, but they require high processing levels, large current thresholds, poor beam quality, and usually need to work at low temperatures. Solid-state lasers are compact in structure and small in size, but limited by doping ions and doping technology, it is difficult to expand the output wavelength, and the efficiency and power are generally not high. The damage threshold of gas lasers is very hig...

AI Technical Summary

Problems solved by technology

However, due to the current immaturity of mid-infrared optical fiber preparation technology, low damage threshold, relatively high transmission loss, high cost, and poor thermal stability, the output power level of mid-infrared fiber lasers is very limited.

In addition, limited by the type of doped rare earth ions, it is very difficult to further extend the output laser wavelength to a long wavelength

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