Tellurate fibre-based raman fibre laser device with mid-infrared band of over 5 microns

Abstract

The invention discloses a tellurate fibre-based raman fibre laser device with a mid-infrared band of over 5 microns. The raman fibre laser device is characterized by comprising a tellurate fibre, wherein fibre bragg grating pairs for reflecting a first-order raman stokes signal and a second-order raman stokes signal are etched in regions close to two ends of the tellurate fibre; one end of the tellurate fibre is connected with a high-power erbium-doped fluoride fibre laser device; and output light of the high-power erbium-doped fluoride fibre laser device enters the tellurate fibre through an optical coupling system. The tellurate fibre disclosed by the invention has a large raman frequency shift and a large raman gain bandwidth; mid-infrared laser of which the output wavelength exceeds 5 microns is generated through first-order stimulated raman scattering and second-order stimulated raman scattering of the fibre; and a laser output of which the output wavelength exceeds 10 microns can be obtained through further expansion.

Description

technical field [0001] The invention belongs to the field of fiber lasers, in particular to a Raman fiber laser whose output wavelength exceeds the mid-infrared 5 μm band. Background technique [0002] Fiber lasers have the advantages of low threshold, high conversion efficiency, good beam quality, good heat dissipation, compact structure and easy integration. At present, the most mature wavebands of fiber lasers are located in the 1.06 and 1.55μm wavebands, mainly using ytterbium doped (Yb 3+ ) and Erbium-doped (Er 3+ ) rare earth ions emit light. Among them, the 1.06μm band can obtain high power output due to the use of high-concentration ytterbium-doped optical fibers; the 1.55μm band can be used in optical fiber communication systems. [0003] In recent years, fiber lasers in the mid-infrared band have developed rapidly. The reason is that lasers in the mid-infrared band have broad application prospects, such as laser microsurgery, environmental trace gas detection, ...

AI Technical Summary

Problems solved by technology

But there are also several disadvantages: high output power requires high concentration of rare earth ion doping; the pumping wavelength and emission wavelength of the laser depend on the absorption and emission characteristics of the rare earth ion itself

Optical fibers of the above two materials are not suitable for generating mid-infrared lasers with a wavelength of 5 μm and longer

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