Single-frequency single-polarization liner cavity ytterbium-doping optical fiver laser

Abstract

The invention discloses a single-frequency single-polarization linear-cavity ytterbium-doped fiber laser. The A end of a laser pumping source (1) is fused with the B end of a single-mode fiber gratingcomponent (2); the A end of the single-mode fiber grating component (2) is fused with the B end of a photosensitive stress birefringent ytterbium-doped polarization maintaining fiber component (3); the A end of the photosensitive stress birefringent ytterbium-doped polarization maintaining fiber component (3) is fused with the B end of a single-mode polarization maintaining fiber (4) according to0-degree angle opposite shafts. The fiber laser adopts the single-mode fiber grating component (2) as a back cavity mirror, adopts a polarization maintaining fiber grating (3a) in the photosensitivestress birefringent ytterbium-doped polarization maintaining fiber component (3) as an output front cavity mirror and adopts ytterbium-doped optical fiber as a gain medium, and a linear-cavity fiber laser with the length less than 5 cm can be formed on two gratings and the ytterbium-doped optical fiber between the two gratings. Ytterbium-doped polarization maintaining optical fiber outside a linear cavity can be used as a fiber amplifier which amplifies laser signals output from the linear cavity, so as to obtain the single-frequency single-polarization laser output with higher power.

Description

technical field [0001] The present invention relates to a fiber laser, more particularly, refers to a single-frequency laser with narrow linewidth (linewidth less than 10kHz), single polarization (degree of polarization > 20dB), output wavelength at 1060nm, and coherence length of more than 10km Single-polarization linear cavity ytterbium-doped fiber laser. Background technique [0002] Fiber laser is developed on the basis of fiber amplifier technology. Similar to fiber amplifier, its gain medium is a section of doped fiber, which is combined with corresponding devices to form an active resonant cavity, which is generally realized under the pumping of semiconductor laser. output of the laser. As a new type of light source, it has unique advantages: flexible optical fiber output, can work in harsh environments, compact structure, high energy density, strong anti-electromagnetic interference, low pumping threshold, high conversion efficiency, tunable range Wide, no need ...

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Problems solved by technology

Although the above method can obtain single longitudinal mode output, it will reduce the laser output power, and its tuning range cannot be too wide

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