Dual-wavelength switchable fiber laser and laser generation method

Abstract

The invention discloses a dual-wavelength switchable optical fiber laser. The fiber laser comprises a first laser pumping source, a first collimating lens, a dichroscope, a first focusing lens, a first fiber bragg grating, a second fiber bragg grating, a single-cladding Dy3 +: InF3-doped fiber, a third fiber bragg grating, a fourth fiber bragg grating, a second focusing lens, a second collimating lens and a second laser pumping source which are sequentially arranged along the horizontal direction. The first laser pumping source generates laser with the wavelength of 1.7 microns, the second laser pumping source generates laser with the wavelength of 2.35 microns, the first fiber bragg grating and the fourth fiber bragg grating form a first resonant cavity for generating laser with the wavelength of 3 microns, and the second fiber bragg grating and the third fiber bragg grating form a second resonant cavity for generating laser with the wavelength of 4.3 microns. According to the invention, double output and free switching of 3 [mu]m laser and 4.3 [mu]m laser can be realized, and the device is high in stability and high in laser generation efficiency.

Description

technical field [0001] The invention belongs to the technical field of mid-infrared fiber lasers, and in particular relates to a dual-wavelength switchable fiber laser and a laser generating method. Background technique [0002] Mid-infrared lasers in the 3-5 μm band have important applications in remote sensing monitoring, infrared countermeasures, and material processing. Among them, rare earth ion-doped fiber lasers, as an emerging laser, have the advantages of small size, compact space, and excellent beam quality. , making it one of the ideal solutions for generating 3-5 μm mid-infrared lasers. At present, the research on laser generation of rare earth ion-doped fiber laser mainly includes two parts: [0003] (1) Single wavelength laser output: [0004] In 2016, Majewski et al. from Macquarie University in Australia used Dy 3+ : ZBLAN fiber obtained laser output with a wavelength of 3 μm. In 2018, Dy-doped 3+ :InF 3 The optical fiber obtained a laser output with a w...

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Problems solved by technology

[0007] In the field of single-wavelength laser output, although there have been researches on obtaining 3 μm wavelength laser in rare earth ion-doped optical fiber, the research on directly obtaining 4.3 μm wavelength has not been reported. The relevant reports are based on gas-filled hollow-core fiber with a single output wavelength.

In the field of multi-wavelength laser output, although there have been researches on obtaining dual-wavelength laser output in the same laser device, these laser outputs are generated simultaneously, and switching output cannot be realized, and the longest wavelength of the obtained dual-wavelength output is only up to 3μm

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