1.7micron fiber laser amplifier

Abstract

The invention relates to a 1.7micron fiber laser amplifier which structurally mainly comprises a signal source, an optical isolator, a pumped source, two wavelength division multiplexers, three thulium doped quartz fiber segments, two band pass filters separating the three thulium doped quartz fiber segments, a fiber bragg grating (FBG) and a fiber jumper wire head. The problems of signal gain saturation caused by ASE in the central wavelength position and severe signal light re-absorption in the 1.7micron short-wavelength operation process of the thulium doped fiber amplifier can be solved effectively, and output of 1.7micron-waveband amplification signals is stable and efficient.

Description

Technical field [0001] The invention relates to an optical fiber amplifier, in particular to an all-fiber thulium-doped silica fiber laser amplifier in the 1.7 μm band. technical background [0002] The 1.7μm band has some unique properties: this band is a strong absorption peak of the CH bond, and the absorption of water in this band is very small. In addition, it is located in a longer wavelength band compared to 808nm, 1064nm and 1550nm Interval. Therefore, this waveband laser light source has extremely important application prospects in the fields of optical coherence tomography (OCT), sebaceous gland laser surgery, high-density polymer welding and cutting, and laser communication. In recent years, some important progress has been made in this band of fiber laser light sources, but there are few reports on this band of fiber amplifiers. [0003] Rare earth Tm 3+ The ion has a wide fluorescence gain spectrum (1650-2200nm), and its rare-earth-doped silica fiber is an ideal gain...

AI Technical Summary

Problems solved by technology

[0004] 1. Thanks to Tm 3+ Belonging to the three-level system, in the short-wavelength laser amplification process, the signal light is easily reabsorbed by the gain fiber, resulting in a significant decrease in the signal light gain;

[0005] 2. Since 1.7μm is already located at Tm 3+ At the edge of the gain spectrum, the amplified spontaneous emission (ASE) at the central wavelength of the fluorescence can easily cause the gain saturation at the signal light and inhibit the fiber laser amplification process in this band

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