A 1.7μm Fiber Laser Amplifier

A fiber laser and amplifier technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problem of signal light gain reduction, achieve the effects of suppressing signal gain saturation effect, good stability, and reducing reabsorption

Active Publication Date: 2020-06-26
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] 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;
[0006] 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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  • A 1.7μm Fiber Laser Amplifier
  • A 1.7μm Fiber Laser Amplifier

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Embodiment Construction

[0027] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

[0028] see figure 1 , a kind of 1.7 μm fiber laser amplifier provided by the present invention, its concrete structure mainly is by signal source 1, optical isolator 2, pumping source 3, wavelength division multiplexer 4, thulium-doped silica fiber 5, band-pass filter 6. Composed of thulium-doped silica fiber 7, bandpass filter 8, thulium-doped silica fiber 9, fiber Bragg grating (FBG) 10, wavelength division multiplexer 11 and fiber jumper head 12. Wherein, the pumping source 3 is welded with the pump arm of the wavelength division multiplexer 4; one end of the optical isolator 2 is welded with the signal source 1, and the other end is welded with the signal injection end of the wavelength division multiplexer 4; One end of the quartz fiber 5 is fused with the bundle end of the wavelength division multiplexer 4, and the other end is fused with the end of t...

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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 a 1.7 μm band all-fiber thulium-doped quartz optical fiber laser amplifier. [0002] technical background [0003] The 1.7μm band has some unique properties: this band is a strong absorption peak of the CH bond, while water absorbs very little in this band, and it is located in a longer wavelength band than 808nm, 1064nm and 1550nm interval. Therefore, the laser light source in this band 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 fiber laser light sources in this band, but there are few reports on fiber amplifiers in this band. [0004] Rare earth Tm 3+ Ion has a wide fluorescence gain spectrum (1650-2200nm), and its rare earth doped silica fiber is an ideal gain medium for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/10
Inventor 郭海涛肖旭升许彦涛陆敏
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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