CN104283095A - High repetition frequency mode-locked fiber laser with phosphate erbium-doped fibers as gain media - Google Patents
High repetition frequency mode-locked fiber laser with phosphate erbium-doped fibers as gain media Download PDFInfo
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- CN104283095A CN104283095A CN201410531626.5A CN201410531626A CN104283095A CN 104283095 A CN104283095 A CN 104283095A CN 201410531626 A CN201410531626 A CN 201410531626A CN 104283095 A CN104283095 A CN 104283095A
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Abstract
The invention discloses a high repetition frequency mode-locked fiber laser with phosphate erbium-doped fibers as gain media. The laser comprises a 976 nm semiconductor laser, an optical fiber wavelength division multiplexer, a chirp fiber bragg grating, the phosphate erbium-doped fibers, a semiconductor saturable absorber mirror and output fibers. The 976 nm semiconductor laser is connected with the phosphate erbium-doped fibers through the optical fiber wavelength division multiplexer, and therefore pump light is coupled into the phosphate erbium-doped fibers. The output end of the optical fiber wavelength division multiplexer is connected with the chirp fiber bragg grating, the chirp fiber bragg grating and the highly doped phosphate erbium-doped fibers are welded together, the other end face of the phosphate erbium-doped fibers is directly and perpendicularly connected to the semiconductor saturable absorber mirror with the low saturation flux, and the signal end of the optical fiber wavelength division multiplexer is connected with the output fibers. The high repetition frequency mode-locked fiber laser has the advantages that high repetition frequency pulse output can be obtained, the structure is simple, the size is small, and performance is stable.
Description
Technical field
The invention belongs to optical fiber and laser technology field, particularly relate to a kind of Gao Zhongying mode locked fiber laser using phosphate Er-doped fiber to be gain media.
Background technology
In recent years, the pulse laser of high repetition frequency is widely used in the fields such as light frequency measurement, high speed electro-optical sampling, time-resolved spectroscopy and laser ranging, and the ultra-short pulse laser of high repetition frequency has important using value in astronomicalc optics in addition.In fiber laser, because the gain coefficient of gain fibre is not high, make the short bore configurations of laser be difficult to realize, therefore cannot reach Gao Zhongying effect, so mode-locked solid-state laser is the dominant force of high recurrent frequency pulse laser device always.Because solid state laser adopts space structure, be unfavorable for compact package and the long-time stability of laser, and fiber laser is all better than solid state laser, so the pulse optical fiber of Gao Zhongying has important researching value in light light conversion efficiency, stability, thermal diffusivity, compactedness etc.
Because the gain coefficient of traditional rare earth doping silica fiber is low, be difficult to the requirement meeting high-repetition-rate femto second optical fiber laser, and phosphate glass can hold the doping content of two orders of magnitude higher than quartz glass, therefore phosphate glass optical fiber has higher gain coefficient, the highly doped phosphate glass optical fiber of cms long just can replace the quartz glass gain fibre of several meters long, thus makes this optical fiber become the perfect Gain optical fiber of Gao Zhongying pulse optical fiber.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of Gao Zhongying mode locked fiber laser using phosphate Er-doped fiber to be gain media.
In order to achieve the above object, the Gao Zhongying mode locked fiber laser that use phosphate Er-doped fiber provided by the invention is gain media comprises: 976nm semiconductor laser, optical fibre wavelength division multiplexer, chirped fiber Bragg grating, phosphate Er-doped fiber, semiconductor saturable absorbing mirror and output optical fibre, wherein 976nm semiconductor laser is connected with phosphate Er-doped fiber by optical fibre wavelength division multiplexer, thus coupling pump light is entered phosphate Er-doped fiber; The output of optical fibre wavelength division multiplexer is connected with chirped fiber Bragg grating, chirped fiber Bragg grating and highly doped phosphate Er-doped fiber weld together, the other end of phosphate Er-doped fiber is directly vertically connected on the semiconductor saturable absorbing mirror of low saturation flux, and the signal end of optical fibre wavelength division multiplexer connects output optical fibre.
The centre wavelength of described chirped fiber Bragg grating is 1550nm, and as the output end mirror of laser, its reflectivity is 90%-98%, and dispersion measure is-0.015ps2--0.05ps
2.
Described semiconductor saturable absorbing mirror uses the semiconductor saturable absorbing mirror of a low saturation flux as mode-locking device; Its saturation flux is 30-60 μ J/cm
2, modulation depth is 8%-3%.
The length of described phosphate Er-doped fiber is 2-3cm, tail optical fiber and the phosphate Er-doped fiber of chirped fiber Bragg grating weld together, total cut to lengthen is at about 5cm, and the length that the linear resonant cavity of chirped fiber Bragg grating and semiconductor saturable absorbing mirror composition is total is about 5cm.
The advantage of the Gao Zhongying mode locked fiber laser that use phosphate Er-doped fiber provided by the invention is gain media can obtain Gao Zhongying pulse to export, and structure is simple, compact dimensions, stable performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Gao Zhongying mode locked fiber laser that use phosphate Er-doped fiber provided by the invention is gain media; In figure:
1.976nm semiconductor laser 2. optical fibre wavelength division multiplexer
3. chirped fiber Bragg grating 4. phosphate Er-doped fiber
5. semiconductor saturable absorbing mirror (LS-SESAM) 6. laser output optical fibre
Embodiment
Below in conjunction with the drawings and specific embodiments, the Gao Zhongying mode locked fiber laser that use phosphate Er-doped fiber provided by the invention is gain media is described in detail.
As shown in Figure 1, the Gao Zhongying mode locked fiber laser that use phosphate Er-doped fiber provided by the invention is gain media comprises: 976nm semiconductor laser 1, optical fibre wavelength division multiplexer 2, chirped fiber Bragg grating 3, phosphate Er-doped fiber 4, semiconductor saturable absorbing mirror 5 and output optical fibre 6, wherein 976nm semiconductor laser 1 is connected with phosphate Er-doped fiber 4 by optical fibre wavelength division multiplexer 2, thus coupling pump light is entered phosphate Er-doped fiber 4; The output of optical fibre wavelength division multiplexer 2 is connected with chirped fiber Bragg grating 3, chirped fiber Bragg grating 3 and highly doped phosphate Er-doped fiber 4 weld together, the other end of phosphate Er-doped fiber 4 is directly vertically connected on the semiconductor saturable absorbing mirror 5 of low saturation flux, and the signal end of optical fibre wavelength division multiplexer 2 connects output optical fibre 6.
Described phosphate Er-doped fiber 4 have employed extraordinary phosphate Er-doped fiber as gain media, and it has very high gain coefficient (about 5dB/cm), and 2-3cm can meet laser gain needs.
The centre wavelength of described chirped fiber Bragg grating 3 is 1550nm, and as the output end mirror of laser, its reflectivity is 90%-98%, and dispersion measure is-0.015ps2--0.05ps
2.
Described semiconductor saturable absorbing mirror 5 uses the semiconductor saturable absorbing mirror (LS-SESAM) of a low saturation flux as mode-locking device; Its saturation flux is 30-60 μ J/cm
2, modulation depth is 8%-3%.
The pulse that this laser has high repetition frequency exports.The length of phosphate Er-doped fiber 4 is 2-3cm, tail optical fiber and the phosphate Er-doped fiber 4 of chirped fiber Bragg grating 3 weld together, total cut to lengthen is at about 5cm, the length that the linear resonant cavity of chirped fiber Bragg grating 3 and semiconductor saturable absorbing mirror 5 composition is total is about 5cm, repetition rate
c is the speed of light in vacuum, n is the refractive index of optical fiber cable core, L is the length of whole resonant cavity, (phosphate Er-doped fiber L is the length of phosphate Er-doped fiber 4 to L=phosphate Er-doped fiber L+ chirped fiber Bragg grating L, chirped fiber Bragg grating L is the length of chirped fiber Bragg grating 3 in chamber), like this, repetition rate f ≈ 2GHz.
The operation principle of the Gao Zhongying mode locked fiber laser that use phosphate Er-doped fiber provided by the invention is gain media: centre wavelength is that the pump light of 976nm is coupled in phosphate Er-doped fiber 4 by 976nm semiconductor laser 1 by optical fibre wavelength division multiplexer 2, after gain media absorptive pumping light, energy level state forms population anyway, electronics realizes transition in two energy level states, and oscillate in the resonant cavity that chirped fiber Bragg grating 3 and SESAM form, realize stimulated radiation to amplify, form laser.SESAM is semiconductor saturable absorbing mirror, not only forms a part for resonant cavity, but also modulates laser, realizes pulse and exports.
The pulse that this laser has femtosecond exports, and output pulse width is 100fs-500fs.
The Gao Zhongying mode locked fiber laser that use phosphate Er-doped fiber provided by the invention is gain media is for the extraordinary phosphate Er-doped fiber of a kind of use simple and compact for structure, stable performance is as the Gao Zhongying mode locked fiber laser of gain media.
Claims (4)
1. the Gao Zhongying mode locked fiber laser using phosphate Er-doped fiber to be gain media, it is characterized in that: it comprises: 976nm semiconductor laser (1), optical fibre wavelength division multiplexer (2), chirped fiber Bragg grating (3), phosphate Er-doped fiber (4), semiconductor saturable absorbing mirror (5) and output optical fibre (6), wherein 976nm semiconductor laser (1) is connected with phosphate Er-doped fiber (4) by optical fibre wavelength division multiplexer (2), coupling pump light is entered phosphate Er-doped fiber (4) thus; The output of optical fibre wavelength division multiplexer (2) is connected with chirped fiber Bragg grating (3), chirped fiber Bragg grating (3) and highly doped phosphate Er-doped fiber (4) weld together, the other end of phosphate Er-doped fiber (4) is directly vertically connected on the semiconductor saturable absorbing mirror (5) of low saturation flux, and the signal end of optical fibre wavelength division multiplexer (2) connects output optical fibre (6).
2. the use phosphate Er-doped fiber according to claim 1 Gao Zhongying mode locked fiber laser that is gain media, it is characterized in that: the centre wavelength of described chirped fiber Bragg grating (3) is 1550nm, as the output end mirror of laser, its reflectivity is 90%-98%, and dispersion measure is-0.015ps2--0.05ps
2.
3. the use phosphate Er-doped fiber according to claim 1 Gao Zhongying mode locked fiber laser that is gain media, is characterized in that: described semiconductor saturable absorbing mirror (5) uses the semiconductor saturable absorbing mirror of a low saturation flux as mode-locking device; Its saturation flux is 30-60 μ J/cm
2, modulation depth is 8%-3%.
4. the use phosphate Er-doped fiber according to claim 1 Gao Zhongying mode locked fiber laser that is gain media, it is characterized in that: the length of described phosphate Er-doped fiber (4) is 2-3cm, tail optical fiber and the phosphate Er-doped fiber (4) of chirped fiber Bragg grating (3) weld together, total cut to lengthen is at about 5cm, and the total length of the linear resonant cavity that chirped fiber Bragg grating (3) and semiconductor saturable absorbing mirror (5) form is about 5cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410531626.5A CN104283095A (en) | 2014-10-10 | 2014-10-10 | High repetition frequency mode-locked fiber laser with phosphate erbium-doped fibers as gain media |
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| CN201410531626.5A CN104283095A (en) | 2014-10-10 | 2014-10-10 | High repetition frequency mode-locked fiber laser with phosphate erbium-doped fibers as gain media |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447637A (en) * | 2008-12-31 | 2009-06-03 | 华南理工大学 | Single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power |
| CN203218698U (en) * | 2013-04-24 | 2013-09-25 | 山东海富光子科技股份有限公司 | High-power picosecond pulse type ytterbium-doped all-fiber laser |
| CN204088866U (en) * | 2014-10-10 | 2015-01-07 | 天津欧泰激光科技有限公司 | Use the Gao Zhongying mode locked fiber laser that phosphate Er-doped fiber is gain media |
-
2014
- 2014-10-10 CN CN201410531626.5A patent/CN104283095A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101447637A (en) * | 2008-12-31 | 2009-06-03 | 华南理工大学 | Single longitudinal-mode optical fiber laser with low noise, narrow linewidth and high power |
| CN203218698U (en) * | 2013-04-24 | 2013-09-25 | 山东海富光子科技股份有限公司 | High-power picosecond pulse type ytterbium-doped all-fiber laser |
| CN204088866U (en) * | 2014-10-10 | 2015-01-07 | 天津欧泰激光科技有限公司 | Use the Gao Zhongying mode locked fiber laser that phosphate Er-doped fiber is gain media |
Non-Patent Citations (1)
| Title |
|---|
| RAJESH THAPA ET AL.: "All-fiber fundamentally mode-locked 12 GHz laser oscillator based on an Er/Yb-doped phosphate glass fiber", 《OPTICS LETTERS》 * |
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