CN105356212A - Fiber laser comprising optical fiber device adopting lattice structure for optical fiber inside - Google Patents
Fiber laser comprising optical fiber device adopting lattice structure for optical fiber inside Download PDFInfo
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- CN105356212A CN105356212A CN201510981976.6A CN201510981976A CN105356212A CN 105356212 A CN105356212 A CN 105356212A CN 201510981976 A CN201510981976 A CN 201510981976A CN 105356212 A CN105356212 A CN 105356212A
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- lattice structure
- fiber
- optical fibre
- fiber laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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Abstract
The invention provides a fiber laser comprising an optical fiber device adopting a lattice structure for optical fiber inside. The lattice structure is manufactured in optical fibers, the optical fiber device with the built-in lattice structure is formed, and selection of the output wavelength of the laser is realized. The wavelength selectivity characteristic of the lattice structure is adjusted through control of arrangement and distribution of lattices and the sizes of the lattices. Compared with FBG (fiber bragg grating), the optical fiber device based on the inside lattice structure can be more flexible in wavelength selection method design. Meanwhile, the lattice structure is manufactured in the optical fibers, so that the structure of the fiber laser is compact. Certain fiber lasers with special properties, such as multi-wavelength, single longitudinal mode, single polarization and the like, can be obtained through proper design of distribution of the lattice structure.
Description
Technical field
The invention belongs to fiber laser field, more specifically, the present invention relates in a kind of laser resonant cavity and have employed the fiber laser that inside has the optical fibre device of lattice structure.
Background technology
Fiber laser due to its excellent beam quality, stable structure and be easy to realize the excellent characteristics such as high-power output and obtain increasing investigation and application.According to the composition of laser, the structure of fiber laser also includes three elements of laser: resonant cavity, gain media and pumping source.
In fiber laser, conventional gain media all has wider gain spectral, in order to realize the Laser output of specific wavelength, often needing to add the device with wavelength selectivity in resonant cavity, comprising optical filter, interferometer, optical mirror and fiber grating etc.
Fiber grating owing to having good wavelength selectivity, and is easy to and gain fibre welding, is widely used in fiber laser.Utilizing fiber grating to form in the fiber laser of resonant cavity, mainly make use of the wavelength selectivity of fiber grating and semi-transparent semi-reflecting characteristic.The resonance wavelength of fiber grating determines the output wavelength of fiber laser, and the resonance wavelength of tunable fiber grating can realize the adjustment to laser output wavelength.Introduce the fiber laser of fiber grating, decrease the demand to optical-mechanical device, make the tuning performance that optical fiber laser structure is compacter and good.Form in the fiber laser of resonant cavity at the common fiber grating that utilizes, what have is produced on gain fibre by fiber grating, and what have is produced on non-gain fibre, then to be linked together formation resonant cavity by alternate manner and gain fibre.
In the manufacturing technology of existing fiber grating, phase mask plate method and double beam interferometry are common methods.But in these preparation methods, the cycle of fiber grating is determined by the cycle of phase mask plate or the wavelength of interference light, not easily realizes design arbitrarily, therefore makes the output wavelength of fiber laser tuning limited.
Summary of the invention
Cycle for the fiber grating of existing fiber laser technique existence is determined by the cycle of phase mask plate or the wavelength of interference light, not easily realize any design problem, the present invention proposes and a kind ofly have employed the fiber laser that inside of optical fibre has the optical fibre device of lattice structure.
Inside of optical fibre of the present invention has the optical fibre device of lattice structure, refer to the dot matrix that the point that inside of optical fibre has refractive index to be different from optical fiber is formed, the refractive index of these points is different from optical fiber background material, described dot matrix is according to cycle or arrangement paracycle, make the refractive index of inside of optical fibre according to the rule change of design, according to the rule of variations in refractive index to the reflection of the light of different wave length and transmissivity different, like this, the wavelength selectivity of optical fibre device is changed, realize the selection of the wavelength to light thus, obtain designed optical fibre device thus, by structure and the distribution of design inside of optical fibre dot matrix, the wavelength selectivity designing this device neatly can be realized.
Have the optical fibre device of lattice structure based on inside of optical fibre, the fiber laser technology scheme that the present invention proposes is:
A kind of fiber laser, comprises pumping source, gain fibre and optical fibre device, it is characterized in that, the built-in lattice structure of described optical fibre device, and for realizing wavelength chooses, its lattice structure is that the some arrangement being different from fiber optic materials by inside of optical fibre refractive index forms.
Further, in described fiber laser, described optical fibre device is that the refractive index by changing fiber optic materials internal point position obtains refractive index singular point, and refractive index singular point arranged according to cycle or paracycle, the optical fibre device of the built-in lattice structure formed together with bias light fiber material.
Further, in described fiber laser, described optical fibre device material includes but not limited to silica optical fiber, polymer optical fiber.
In the present invention, the lattice structure of inside of optical fibre can directly be produced in gain fibre, also can be produced on common non-gain fibre, then be welded together with gain fibre.Its concrete scheme is:
A kind of fiber laser, comprises pumping source and gain fibre, it is characterized in that, have built-in lattice structure in described gain fibre or the common non-gain fibre that is connected with described gain fibre, described gain fibre has gain and frequency-selecting function simultaneously; The point arrangement that described lattice structure is different from fiber optic materials by inside of optical fibre refractive index forms, for realizing wavelength chooses.
Further, in described fiber laser, in described lattice structure each point diameter and or distance between points set as required, with or described point be spheroid or other body shape structure, with or disappearance arbitrary plane on multiple adjacent partial points front, obtain the optical fibre device with planar defect.
Further, in described fiber laser, described lattice structure can lack one of them some formation one and have the optical fibre device of lattice defect, and or lack multiple adjacent part point front, forms the optical fibre device with line defect.
Further, in described fiber laser, described lattice structure can lack the multiple adjacent partial points front on arbitrary plane, obtains the optical fibre device with planar defect.
Further, in described fiber laser, the some energy arbitrary arrangement Cheng Dian front in described lattice structure or lattice plane; He or its there is one and above some front or lattice plane, the distance between described some front, lattice plane can adjust.
Further, in described fiber laser, the type of described gain fibre and pumping source is selected according to the actual needs.
Further, in described fiber laser, described point is by by after femto-second laser beam focusing, utilizes femtosecond laser beam and fiber optic materials to interact, thus forms the refractive index singular point that refractive index is different from fiber optic materials.
The present invention adopts the lattice structure of specific distribution to realize the function of wavelength chooses in fiber laser.Compared to other wavelength selecting device, lattice structure directly can be produced on inside of optical fibre, has the advantage of compact conformation.Simultaneously when design wavelength selectivity characteristic, the distribution of lattice structure can design arbitrarily, makes the wavelength selectivity of lattice structure design so more flexible.Thus it is tuning to make the laser output characteristic of fiber laser design more flexibly.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation comprising the ring cavity structure fiber laser of inside of optical fibre lattice structure;
Fig. 2 is the structural representation of the linear cavity structured optical fiber laser comprising inside of optical fibre lattice structure;
Fig. 3 is the distributed feedback fiber laser schematic diagram comprising inside of optical fibre lattice structure optical fibre device;
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
1-pumping source, 2-wavelength division multiplexer, 3-gain fibre, 4-optical fiber circulator, 5-inside has optical fibre device 1, the 6-fiber coupler of lattice structure, 7-annular cavity laser output, 8-connecting fiber, 9-isolator, 10-inside has the optical fibre device 2 of lattice structure, the output of 11-linear laser cavity, the inner optical fibre device 3,13-with lattice structure of 12-is produced on the lattice structure with phase-shift structure on gain fibre, 14 distributed feedback optical fiber laser output end mouths.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
By reference to the accompanying drawings introduction is described further to fiber laser involved in the present invention, but the content included by the present invention is not limited thereto.
What Fig. 1 represented is a kind of structural representation comprising the ring cavity structure fiber laser of inside of optical fibre lattice structure.A single point wherein in dot matrix can focus on rear and fiber optic materials effect by the femto-second laser pulse light beam of high-peak power, and the refractive index changing fiber optic materials obtains.Make these points at the internal reproduction of optical fiber, obtain lattice structure.Wherein 1 represent be pumping source, 2 represent be wavelength division multiplexer, 3 represent be gain fibre, 4 represent be circulator, 5 represent be the optical fibre device that inside has lattice structure, 6 represent be fiber coupler, 7 what represent is the output of laser, and 8 what represent is non-gain fibre.
The structural representation of what Fig. 2 represented the is linear cavity fiber laser comprising inside of optical fibre lattice structure optical fibre device, wherein 1 expression is pumping source, 9 represent be isolator, 10 and 12 represent be the optical fibre device with inner lattice structure, 3 represent be gain fibre, 11 represent be laser output mouth.
What Fig. 3 represented is the distributed feedback fiber laser schematic diagram comprising inside of optical fibre lattice structure optical fibre device.Wherein 1 what represent is pumping source, and 2 what represent is wavelength division multiplexer, and 8 what represent is optical fiber, and 13 what represent is the lattice structure with a phase-shift structure be produced on gain fibre, and 14 what represent is the output of laser.
Embodiment 1
The invention process example 1 as shown in Figure 1.First on optical fiber, produce the lattice structure of satisfying the demand, the pump light exported from the pumping source 1 shown in Fig. 1 enters in the annular chamber of fiber laser by 2 wavelength division multiplexers represented Fig. 1 the pumping realizing carrying out gain fibre 3, and the optical fiber circulator in Fig. 1 represented by 4 ensure that the light in resonant cavity of fibre-optical laser transmits along same direction.2 ports that the optical fibre device 5 with inside of optical fibre lattice structure connects 4 optical fiber circulators represented in the drawings play the effect of wavelength chooses.Lattice structure 5 only realizes strong reflection to specific wavelength, determines the output wavelength of fiber laser thus.Laser is used as the output port of laser by a port of the fiber coupler in Fig. 1 represented by 6, namely as in Fig. 1 represented by 7.
Embodiment 2
The invention process example 2 as shown in Figure 2.First on optical fiber, the optical fibre device that inside comprises lattice structure is produced, as shown in 10 and 12 in Fig. 2.Again it is connected with gain fibre.The pump light that pumping source from Fig. 2 shown in 1 exports, by fibre optic isolater, enters the optical fibre device 10 that inside comprises lattice structure.Pump light by 10, can carry out pumping to gain fibre 3.Due to the selective reflecting to specific wavelength of device 10 and 12, wherein 10 is identical with the wavelength of 12 reflections, thus constitutes the resonant cavity of fiber laser.The laser produced is exported by the port shown in 11 in figure.
Embodiment 3
The invention process example 3 as shown in Figure 3.First on gain fibre, produce the lattice structure with phase shift distribution, the lattice structure of phase shift distribution refer to have in this lattice structure spacing between spacing between certain two lattice plane and other lattice plane not etc., namely there occurs phase hit.As shown in figure 13.
As shown in Figure 3.The pump light that pumping source 1 described in Fig. 3 exports enters the lattice structure region 13 be produced on gain fibre by the light wavelength division multiplexing 2 shown in Fig. 3, and carries out pumping to it.Because lattice structure is produced on gain fibre, and there is a phase-shift structure, can resonant cavity be formed like this and realize Laser output.The laser produced is exported by 14 shown in figure.
The main advantage of the present invention's design embodies and have employed the part that inside has the optical fibre device formation laser resonant cavity of lattice structure in the laser, and the output wavelength of optical fibre device to laser that this inside has lattice structure has selectivity characteristic.By the lattice structure of fabrication cycle arrangement in a fiber, making the refractive index of inside of optical fibre by presenting periodic change, realizing thus forming strong reflection to the light of specific wavelength, realizing wavelength selection function.By controlling the cycle of lattice arrangement, the size of dot matrix, realizes carrying out tuning to lattice structure wavelength selectivity.Compared to fiber grating, based on the optical fibre device of inner lattice structure, can be more flexible in Wavelength selecting method design.Meanwhile, lattice structure is produced on inside of optical fibre, makes the compact conformation of fiber laser.Distribution through suitable design lattice structure can obtain the fiber laser with other special nature, such as multi-wavelength, single longitudinal mode, the characteristics such as single polarization.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a fiber laser, comprises pumping source, gain fibre and optical fibre device, it is characterized in that, the built-in lattice structure of described optical fibre device, and for realizing wavelength chooses, its lattice structure is that the some arrangement being different from fiber optic materials by inside of optical fibre refractive index forms.
2. fiber laser according to claim 1, it is characterized in that, described optical fibre device is that the refractive index by changing fiber optic materials internal point position obtains refractive index singular point, refractive index singular point arranged according to cycle or paracycle, the optical fibre device of the built-in lattice structure formed together with bias light fiber material.
3. fiber laser according to claim 1 and 2, is characterized in that, described optical fibre device material includes but not limited to silica optical fiber, polymer optical fiber.
4. a fiber laser, comprises pumping source and gain fibre, it is characterized in that, have built-in lattice structure in described gain fibre or the common non-gain fibre that is connected with described gain fibre, described gain fibre has gain and frequency-selecting function simultaneously; The point arrangement that described lattice structure is different from fiber optic materials by inside of optical fibre refractive index forms, for realizing wavelength chooses.
5. the fiber laser according to claim 1 or 4, it is characterized in that, in described lattice structure each point diameter and or distance between points set as required, with or described point be spheroid or other body shape structure, with or disappearance arbitrary plane on multiple adjacent partial points front, obtain the optical fibre device with planar defect.
6. the fiber laser according to claim 1 or 4, it is characterized in that, described lattice structure can lack one of them some formation one and have the optical fibre device of lattice defect, and or lack multiple adjacent part point front, forms the optical fibre device with line defect.
7. the fiber laser as described in claim 1 or 4, is characterized in that, described lattice structure can lack the multiple adjacent partial points front on arbitrary plane, obtain having planar defect optical fibre device.
8. the fiber laser as described in claim 1 or 4, is characterized in that, the some energy arbitrary arrangement Cheng Dian front in described lattice structure or lattice plane; He or its there is one and above some front or lattice plane, the distance between described some front, lattice plane can adjust.
9. the fiber laser according to claim 1 or 4, the type of gain fibre and pumping source is selected according to the actual needs.
10. as the fiber laser as described in arbitrary in claim 1-8, it is characterized in that, described point is by by after femto-second laser beam focusing, utilizes femtosecond laser beam and fiber optic materials to interact, thus forms the refractive index singular point that refractive index is different from fiber optic materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510981976.6A CN105356212B (en) | 2015-12-22 | 2015-12-22 | A kind of optical fiber laser including inside of optical fibre lattice structure optical fibre device |
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| CN201510981976.6A CN105356212B (en) | 2015-12-22 | 2015-12-22 | A kind of optical fiber laser including inside of optical fibre lattice structure optical fibre device |
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| CN105356212A true CN105356212A (en) | 2016-02-24 |
| CN105356212B CN105356212B (en) | 2018-10-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885539A (en) * | 2023-09-07 | 2023-10-13 | 西北工业大学 | All-fiber laser and method for generating multi-wavelength synchronous pulse laser |
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| CN116885539A (en) * | 2023-09-07 | 2023-10-13 | 西北工业大学 | All-fiber laser and method for generating multi-wavelength synchronous pulse laser |
| CN116885539B (en) * | 2023-09-07 | 2023-12-15 | 西北工业大学 | All-fiber laser and method for generating multi-wavelength synchronous pulse laser |
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| CN105356212B (en) | 2018-10-09 |
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