A dual-wavelength switchable fiber laser and laser generation method

Abstract

The invention discloses a dual-wavelength switchable fiber laser, which comprises a first laser pump source, a first collimating lens, a dichromatic mirror, a first focusing lens, a first fiber grating, and a second optical fiber arranged in sequence along the horizontal direction. Grating, single cladding Dy-doped 3+ :InF 3 Optical fiber, the third fiber grating, the fourth fiber grating, the second focusing lens, the second collimating lens and the second laser pumping source, the first laser pumping source generates laser with a wavelength of 1.7 μm, and the second laser pumping source Generate a laser with a wavelength of 2.35 μm, the first fiber grating and the fourth fiber grating form a first resonant cavity that produces a 3 μm laser, and the second fiber grating and a third fiber grating form a second resonant cavity that produces a 4.3 μm laser; the present invention can Realize dual output and free switching of 3μm laser and 4.3μm laser, and the device has strong stability and high 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 3~5μm 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 wa...

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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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