Two-micron-waveband low-threshold-value thulium-doped optical filer laser device for joint pumping of fiber core and cladding

Abstract

The invention discloses a two-micron-waveband low-threshold-value thulium-doped optical filer laser device for joint pumping of a fiber core and cladding and aims at solving the problem that an optical filer laser with the signal optical wavelength within the two-micron waveband is high in threshold value. The laser device is constituted by a pumping source, a gain medium and a resonant cavity, the pumping source is connected with the resonant cavity, the gain medium is located in the resonant cavity, and the resonant cavity is of a linear cavity structure or an annular cavity structure. If the resonant cavity is of the linear cavity structure, the pumping source is composed of a 790nm-waveband multimode pumping source body, a 1.5micron-waveband single-mode pumping source body and a pumping-signal beam bundler, and the resonant cavity is composed of two reflection-type optical fiber bragg gratings; if the resonant cavity is of the annular cavity structure, compared with the situation that the resonant cavity is of the linear cavity structure, the pumping source has one more wavelength division multiplexer, and the resonant cavity is composed of an optical fiber coupler, an optical fiber circulator and a reflection-type optical fiber bragg grating; the gain medium is thulium-doped double-clad optical fibers or thulium-and-holmium-doped double-clad optical fibers. By means of the two-micron-waveband low-threshold-value thulium-doped optical filer laser device, the laser threshold value of the two-micron-waveband optical filer laser device can be lowered, and generation of ASE is effectively inhibited.

Description

technical field [0001] The invention discloses a core-cladding co-pumped 2 μm band low-threshold thulium-doped fiber laser, which belongs to the field of laser technology. Background technique [0002] The 2μm-band fiber laser with thulium-doped fiber as the gain medium is used in lidar, remote detection, biomedicine, and as a pumping source for Ho:YAG (holmium-doped yttrium aluminum garnet) solid-state lasers and optical parametric oscillators to realize mid-infrared band lasers Output and other aspects have important application value and broad application prospects. Moreover, all the devices used are currently commercial optical fiber devices, the system is easy to be fully optical fiber, the structure is simple, and the stability is high. [0003] Thulium ion (Tm 3+ ) has multiple absorption peaks, so thulium-doped fiber lasers have multiple options for pumping wavelengths. The usual pumping wavelengths are located in the 790nm band, 1.06μm band and 1.5μm band, and esp...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the high laser threshold of the thulium-doped fiber laser pumped by the 790nm cladding pumped by the signal light wavelength in the 2μm band, especially less than 1.9μm

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