Medium-infrared fiber laser system covering any wavelength in band between 2 and 10 microns based on soft glass fiber

Abstract

The invention discloses a medium-infrared fiber laser system covering any wavelength in a band between 2 and 10 microns based on a soft glass fiber. The medium-infrared fiber laser system is characterized in that tellurate, sulphide and selenide soft glass fibers are combined, and laser output at any wavelength in a band between 2 and 10 microns is realized based on the high nonlinear effect of the fibers; and the whole system is composed of five parts, namely, a seed light generation unit, a seed light amplification unit, a tellurite fiber cascaded Raman unit, a sulfide fiber cascaded Raman unit and a selenide fiber cascaded Raman unit. The soft glass fiber on which the system is based has high Raman gain coefficient, large Raman frequency shift and wide Raman gain bandwidth. Medium-infrared laser with output wavelength being 2-10 microns is generated based on the cascaded stimulated Raman process of the fiber. Through further expansion, laser output with output wavelength above 13 microns can be obtained.

Description

technical field [0001] The invention belongs to the field of fiber lasers, in particular to a mid-infrared fiber laser system covering any wavelength in the 2-10 μm band based on a soft glass fiber. Background technique [0002] So far, research on fiber lasers has mainly focused on the near-infrared, especially the 1.06μm and 1.55μm bands, and its output power is close to the theoretical limit that materials can withstand. In recent years, more and more attention has been paid to mid-infrared fiber lasers with wavelengths greater than 2 μm. 2-10μm mid-infrared lasers are widely used in many fields such as biomedicine, national defense, environmental protection and public safety. For example, 2.8-3.2μm corresponds to the strongest absorption band of water in human tissue, which is the best wavelength range for laser medical surgery. 3.0-5.0μm is the window through which the atmosphere passes. Lasers in this band can be used for infrared imaging lighting, directional infrar...

AI Technical Summary

Problems solved by technology

Although some well-known scientific research institutions in the world have made some progress, there are two obvious shortcomings: the experimentally obtained Raman laser wavelength is below 4 μm, and it is basically blank in the longer wavelength band; the laser output power is low, the maximum is only A few watts

Domestic research on mid-infrared Raman fiber lasers has just started, and no influential experimental results have been reported yet.

At present, whether compared with the mid-infrared rare earth ion doped fiber laser or the near-infrared Raman fiber laser, the mid-infrared Raman fiber laser lags behind in terms of maximum power, laser output form and tunability.

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