CN101783477B - Filtering endoscope used for optical fiber laser and optical fiber laser - Google Patents
Filtering endoscope used for optical fiber laser and optical fiber laser Download PDFInfo
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- CN101783477B CN101783477B CN 201010033751 CN201010033751A CN101783477B CN 101783477 B CN101783477 B CN 101783477B CN 201010033751 CN201010033751 CN 201010033751 CN 201010033751 A CN201010033751 A CN 201010033751A CN 101783477 B CN101783477 B CN 101783477B
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Abstract
The invention relates to a filtering endoscope used for an optical fiber laser and the optical fiber laser, which belongs to the technical field of endoscopes and is characterized in that the filtering endoscope used by an optical fiber laser is formed by coaxially connecting optical fibers plated with thin layers with different optical properties and doped optical fibers serving as gain media. The optical fiber laser comprises a filtering endoscope and a pumping device for injecting pump light into gain optical fibers. Since the used filtering endoscope is formed by plating the film on an end surface, and the anti-damage threshold of the filtering endoscope is higher, the laser can work under high power; since the filtering endoscope comprises filtering optical fibers the structural parameters of which are different from those of the gain optical fibers, high-order mode loss is increased in laser oscillation and transmission, and the quality of output light beams is improved.
Description
Technical field
The present invention relates to a kind of filtering endoscope, particularly a kind of filtering endoscope and fiber laser for fiber laser.
Background technology
One of research topic of forefront is widely used in a plurality of fields such as optical storage of data, optical communication, sensing technology, spectrum and medical application in the current photoelectron technology research field of fiber laser conduct.In the research process of fiber laser, high power and high light beam quality are output into the focus of paying close attention to into people.
Realize high-power output, not only will be to the selection established standards of gain media, pumping source, the design of chamber mirror and selection also are important aspects.The characterisitic parameter of chamber mirror wants to satisfy the requirement of high power laser light vibration.Laser structure is simple in order to make, light path is convenient to regulate, and present fiber laser generally adopts fiber grating, common end face coating etc. as the chamber mirror.But in superpower laser, strong beam can cause certain destruction damage to grating and common plated film, and the refractive index of grating or the film structure of plated film are changed, and affects its performance; They can be ablated when serious, make its inefficacy.
The output of realization high light beam quality needs to suppress the starting of oscillation of high-rder mode, makes and contains hyperbaric low-order mode in the Output of laser.In fiber laser, competitiveness between each transverse mode and the loss of pattern, gain overlapping degree, and pattern between the factors such as coupling relevant, (list of references Optics Express, Vol.15 (6), p3236-3246,2007), if pattern loss in a backhaul of laser generation surpasses gain, then this pattern will be lost ground in competition, and weakened or suppressed gradually.So change the loss mechanism of pattern, make the loss of high-rder mode greater than the loss of low-order mode, then can guarantee the low-order mode starting of oscillation and high-rder mode can not be vibrated, play the modeling effect.
Summary of the invention
For the problems referred to above, and based on above-mentioned theory, the purpose of this invention is to provide a kind of filtering endoscope for fiber laser and fiber laser.
For achieving the above object, the present invention takes following technical scheme:
The filtering endoscope that described fiber laser uses is formed by connecting on core cross sections coaxially by the filtering optical fiber that is used for fiber laser and the gain fibre of described fiber laser.Wherein,
Filtering optical fiber as the laser high reflective mirror or/and on the end face of laser output mirror, be coated with the optical coating layer with different optical characteristic, consist of the chamber mirror with filter action.That described optical characteristics comprises at least is anti-reflection, reflection or these optical characteristics of half-reflection and half-transmission.Described filtering optical fiber will be removed coat before plated film;
The parameter of gain fibre is different from described filtering optical fiber, and described parameter comprises that core diameter, fiber core refractive index, numerical aperture, core shape, covering shape and number and fiber core refractive index distribute;
Described filtering optical fiber and gain fibre, and the plated film of filtering fiber end face have consisted of the resonant cavity of described fiber laser jointly.
Described filtering optical fiber, anti-reflection to the pump light wavelength as the optical coating layer of laser mirror one end, laser wave is grown tall instead; As the optical coating layer of laser output mirror one end, pumping wave is grown tall anti-or anti-reflection, optical maser wavelength is partly seen through.
When gain fibre and filtering optical fiber all adopt doubly clad optical fiber, and the numerical aperture of described gain fibre is larger, core diameter, the cladding structure of two kinds of optical fiber are identical, when the refraction index profile of two kinds of cross section of optic fibre all was Step distribution, these two kinds of optical fiber of described filtering optical fiber and gain fibre had consisted of the Fabry-Perot resonant cavity jointly.
Described fiber laser by filtering endoscope, as the doped fiber of gain media, and forms to the pump arrangement that the gain fibre end face injects pump light.Described filtering fused fiber splice is at the doped fiber two ends as gain media.Wherein,
Described end pumping mode replaces with multiple beam coupling pumping mode;
Described filtering optical fiber is with the gluing doped fiber two ends that are connected on as gain media of optics;
Described gain media is made of doped fiber.The doping way of gain particle on described gain fibre cross section is for flat-top mixes or flat part doping or gradual change type doping.
Described fiber laser, by filtering endoscope, as the doped fiber of gain media, and the pump arrangement that injects pump light to the gain fibre side forms.Described filtering fused fiber splice is at the doped fiber two ends as gain media.Wherein,
Described profile pump mode replaces with distributed pump mode;
Described filtering optical fiber is with the gluing doped fiber two ends that are connected on as gain media of optics;
Described gain media is made of doped fiber.The doping way of gain particle on described gain fibre cross section is for flat-top mixes or flat part doping or gradual change type doping.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the adding of the present invention filtering optical fiber different from the gain fibre parameter, make in the gain medium issuable higher order mode after repeatedly passing through the different waveguide of parameter, energy is weakened, and lose the advantage of mode competition, thereby so that low step mode occupies more power proportion in output beam, therefore can obtain the Laser output of better beam quality.2, the present invention realizes control to pattern from the vertical refraction index profile of change fiber waveguide, and complements each other from the modeling method that transversely changes refraction index profile, gain profiles, can be used in conjunction with, and obtains better modeling effect.3, the present invention uses end face coating as the chamber mirror of fiber laser, and the anti-damage threshold of plated film is relatively high, thus can be operated in the laser and amplifier of higher-wattage, and unlikely damage.4, the present invention has avoided directly plated film on gain fibre, thus in the coating process to the perturbation of filtering optical fiber property or structural parameters, can not have influence on gain fibre, therefore can not affect the vibration of laser.5, the present invention adopts the method at the direct plated film of filtering fiber end face, simple and easy to do, need not to adopt special pump mode and chamber mirror structure to reach and improve beam quality and the dual purpose of preparation than high damage threshold chamber mirror, be easy to realize on the basis of traditional fiber laser.The present invention can be widely used in the fiber laser.
Description of drawings
Fig. 1 is filtering endoscope schematic diagram of the present invention.
Fig. 2 is the embodiment that the present invention is used for fiber laser.
Among the figure, 1 optical coating layer, 2 filtering optical fiber, 3 gain fibres, 4 filtering fiber cores, 5 filtering fiber claddings, 6 gain fibre fibre cores, 7 gain fibre coverings, 8 gain fibre overlays, 9LD pumping source, 10 plated film chamber mirrors, 11 plated film chamber mirrors.
Fig. 3 is the enforcement illustration that the present invention is used for fiber amplifier.
Embodiment
A kind of filtering endoscope for fiber laser comprises filtering optical fiber and optical coating layer.It is characterized in that: be coated with optical film at the filtering fiber end face and consist of the chamber mirror, the chamber mirror has the function of filtering simultaneously concurrently.
Described optical coating layer is the fiber end face film with certain optical properties such as anti-reflection, reflection or half-reflection and half-transmissions.
Described filtering optical fiber is the two section optical fiber different from the gain fibre parameter of laser.They can have different core diameters, or different fiber core refractive indexs, also can be different numerical apertures, or different core shape, can also be different covering shape and numbers, or different fiber core refractive index distributions etc.Filtering optical fiber is removed overlay before plated film, after plated film is finished, connect as one with gain fibre.
The gain fibre of described filtering optical fiber and laser, the refraction index profile on the cross section adopts the distribution of Step distribution, graded profile or other form.
The two-part parameter difference of gain fibre of described filtering optical fiber and laser is determined by the requirement of model selection.
A kind of fiber laser that uses filtering endoscope comprises pump arrangement, and filtering endoscope is as doped fiber and the filtering optical fiber of gain media.It is characterized in that: at one section filtering fiber end face plated film different from the gain fibre parameter, form the chamber mirror (or filtering film plating layer of amplifier) of laser.When light beam is travelled to and fro between between gain fibre and the filtering optical fiber, the power loss of high-rder mode is larger than low-order mode, in mode competition, lose ground gradually, gradually weakened or suppressed, make the laser beam of final output contain the low-order mode composition of higher-wattage proportion, thereby obtain the output of better beam quality.
The combination of one or more in the pump modes commonly used such as pump arrangement employing semiconductor laser (LD) end pumping, profile pump, multiple beam coupling pumping or the distributed pumping of described fiber laser, amplifier.
The gain media of described fiber laser, amplifier is made of doped fiber.The doping way of gain particle on cross section of optic fibre is for flat-top mixes, flat part mixes or gradual change type mixes.
Described filtering endoscope can have different optical characteristics.Such as, the laser high reflective mirror is anti-reflection to the pump light wavelength, and laser wave is grown tall instead; Or only laser wave is grown tall instead.Laser output mirror partly sees through optical maser wavelength, pumping wave is grown tall anti-or anti-reflection; Or only optical maser wavelength is partly seen through.
Embodiment 1:
As shown in Figure 2, the present embodiment is the fiber laser that adopts filtering endoscope.LD pumping source (9), end face coating (10), (11), doubly clad optical fiber (3) and filtering optical fiber (2) consist of basic Fabry-Perot resonant cavity, and the plated film at optical fiber two ends (10), (11) are as the chamber mirror.The plated film chamber mirror (10) of left end is thoroughly high to pump light, and is high anti-to optical-fiber laser; Plated film (11) as the output cavity mirror is thoroughly high to pump light, and optical-fiber laser is partly seen through.The numerical aperture of doubly clad optical fiber (3) is larger, and the numerical aperture of filtering optical fiber (2) is less, and the core diameter of two type optical fibers is identical, and cladding structure is identical, and the refraction index profile of cross section all adopts Step distribution.Pump light is the inner cladding of injection fibre from the side, in the laser generation of optical fiber underexcitation.In a backhaul, laser beam is wanted to pass filtering optical fiber (2) twice, because the numerical aperture of (2) is relatively less, so can cause that the power division of pattern tilts to low-order mode in the laser beam, when the numerical aperture of (2) is selected when reasonable, light beam is through behind the multiple oscillation, the power that the high-rder mode loss is larger, thereby cause low-order mode in competition, to occupy advantage, effectively suppress the generation of high-rder mode, export the laser of better beam quality.When the laser beam power that excites was higher, owing to adopting the higher plated film chamber mirror of anti-damage threshold, the chamber mirror still can play corresponding effect and injury-free.
Claims (4)
1. filtering endoscope that is used for fiber laser, it is characterized in that: the filtering endoscope that described fiber laser uses is formed by connecting on core cross sections coaxially by the filtering optical fiber that is used for fiber laser and the gain fibre of described fiber laser; Wherein,
Filtering optical fiber, as the laser high reflective mirror or/and on the end face of laser output mirror, be coated with the optical coating layer with different optical characteristic, consist of the chamber mirror with filter action; That described optical characteristics comprises is anti-reflection, reflection or half-reflection and half-transmission; Described filtering optical fiber will be removed coat before plated film;
Gain fibre, its parameter is different from described filtering optical fiber, and described parameter is core diameter or fiber core refractive index or numerical aperture or core shape or covering shape and number or fiber core refractive index distribution;
Described filtering fused fiber splice or with the gluing two ends that are connected on described gain fibre of optics;
Described filtering optical fiber and gain fibre, and the plated film of filtering fiber end face have consisted of the resonant cavity of described fiber laser jointly.
2. a kind of filtering endoscope for fiber laser according to claim 1 is characterized in that: the optical coating layer as laser high reflective mirror one end of described filtering optical fiber, and anti-reflection to the pump light wavelength, laser wave is grown tall instead; The optical coating layer as laser output mirror one end of described filtering optical fiber grows tall to pumping wave anti-or anti-reflection, and optical maser wavelength is partly seen through.
3. fiber laser that uses filtering endoscope by filtering endoscope, forms as doped fiber and the pump arrangement of gain media; Filtering fused fiber splice or with the gluing doped fiber two ends that are connected on as gain media of optics; Wherein,
Described filtering endoscope is formed by connecting on core cross sections coaxially by the filtering optical fiber and the doped fiber that are used for fiber laser; Filtering optical fiber as the laser high reflective mirror or/and on the end face of laser output mirror, be coated with the optical coating layer with different optical characteristic, consist of the chamber mirror with filter action; That described optical characteristics comprises is anti-reflection, reflection or half-reflection and half-transmission; Described filtering optical fiber will be removed coat before plated film;
Described pump arrangement is for injecting end pumping device or the multiple beam coupling pump device for double-covering optical fibre of pump light to the doped fiber end face;
Described gain media is made of doped fiber; The doping way of gain particle on described doped fiber cross section is for flat-top mixes or flat part doping or gradual change type doping;
Described doped fiber, its parameter is different from described filtering optical fiber, and described parameter is core diameter or fiber core refractive index or numerical aperture or core shape or covering shape and number or fiber core refractive index distribution.
4. fiber laser that uses filtering endoscope by filtering endoscope, forms as doped fiber and the pump arrangement of gain media; Filtering fused fiber splice or with the gluing doped fiber two ends that are connected on as gain media of optics; Wherein,
Described filtering endoscope is formed by connecting on core cross sections coaxially by the filtering optical fiber and the doped fiber that are used for fiber laser; Filtering optical fiber as the laser high reflective mirror or/and on the end face of laser output mirror, be coated with the optical coating layer with different optical characteristic, consist of the chamber mirror with filter action; That described optical characteristics comprises is anti-reflection, reflection or half-reflection and half-transmission; Described filtering optical fiber will be removed coat before plated film;
Described pump arrangement is for injecting profile pump device or the distributed pump arrangement of pump light to the doped fiber side;
Described gain media is made of doped fiber; The doping way of gain particle on described doped fiber cross section is for flat-top mixes or flat part doping or gradual change type doping;
Described doped fiber, its parameter is different from described filtering optical fiber, and described parameter is core diameter or fiber core refractive index or numerical aperture or core shape or covering shape and number or fiber core refractive index distribution.
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| CN 201010033751 CN101783477B (en) | 2010-01-08 | 2010-01-08 | Filtering endoscope used for optical fiber laser and optical fiber laser |
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| CN 201010033751 CN101783477B (en) | 2010-01-08 | 2010-01-08 | Filtering endoscope used for optical fiber laser and optical fiber laser |
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| CN105487173A (en) * | 2016-01-11 | 2016-04-13 | 中国工程物理研究院激光聚变研究中心 | Mode field matching device and optical fiber laser |
| CN106772810A (en) * | 2017-03-13 | 2017-05-31 | 佛山市莱拓科技有限公司 | Reduce back reflective doubly clad optical fiber attachment structure and doubly clad optical fiber |
| CN107732641A (en) * | 2017-11-10 | 2018-02-23 | 山东大学 | High-capacity optical fiber laser |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1713464A (en) * | 2004-06-14 | 2005-12-28 | 中国科学院半导体研究所 | Production of resonant cavity of fibre-optical laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1713464A (en) * | 2004-06-14 | 2005-12-28 | 中国科学院半导体研究所 | Production of resonant cavity of fibre-optical laser |
Non-Patent Citations (1)
| Title |
|---|
| Mali Gong et al.High-order modes suppression in large-mode-area fiber amplifiers and lasers by controlling the mode power allocations.《JOURNAL OF OPTICS A:PURE AND APPLIED OPTICS》.2009,第11卷第015701-1~015701-6页. * |
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