Intermediate infrared laser based on rare earth ion doped ZBLAN optical fiber

Abstract

The invention relates to an intermediate infrared laser based on a rare earth ion doped ZBLAN optical fiber. The mid-infrared laser is characterized in that the mid-infrared laser is connected with one end of a quartz optical fiber through a pumping source, a quartz optical fiber grating is inscribed at the tail end of the other end of the quartz optical fiber, the other end of the quartz optical fiber is connected with one end of a rare earth ion doped ZBLAN optical fiber, and the other end of the rare earth ion doped ZBLAN optical fiber is connected with an optical fiber end cap; the pump light emitted by the pump source passes through the silica fiber and the silica fiber grating, enters the laser resonant cavity formed between the silica fiber grating and the fiber end cap, is absorbed by the rare earth ion doped ZBLAN fiber, and excites mid-infrared laser; and the intermediate infrared laser oscillates in the laser resonant cavity and is output by the optical fiber end cap plated with the dielectric film which partially reflects and partially transmits the intermediate infrared laser wave band. The fiber end cap plated with the dielectric film is used as the output end of the all-fiber laser instead of a ZBLAN fiber bragg grating, so a complex ZBLAN fiber bragg grating preparation process can be avoided, and the cost of the laser is reduced.

Description

technical field [0001] The present application relates to the technical field of lasers, in particular to a mid-infrared laser based on rare earth ion-doped ZBLAN fibers. Background technique [0002] The mid-infrared band is an electromagnetic radiation region within a certain range between visible, near-infrared light and terahertz (THz) bands, especially the typical mid-infrared wavelength range near 3 μm is widely used in physics, chemistry, materials science, Biology, medicine, atmospheric detection, communications, national defense and other national economy and frontier scientific research directions have important application prospects, and have attracted more and more attention in recent years. At present, there are many ways to obtain 3μm mid-infrared laser, such as semiconductor quantum cascade laser, nonlinear parametric oscillation and amplification, solid-state laser, fiber laser, etc. Among them, fiber laser has high conversion efficiency, good heat dissipatio...

AI Technical Summary

Problems solved by technology

[0003] An important scheme of the current mid-infrared 3μm band fiber laser is based on semiconductor laser pumping Er 3 +: ZBLAN optical fiber is produced. There is mainly a configuration based on an all-fiber mid-infrared laser solution written on a ZBLAN (fluoride) optical fiber that is highly reflective and partially reflective to the laser. The laser of this configuration has high stability, A series of advantages such as good flexibility are the main direction for the development of mid-infrared fiber lasers, but at present, the process of directly writing gratings on ZBLAN fibers is complicated, so the cost of lasers is high

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