CN109407440B - Single-mode high-power amplification device based on large-mode-field optical fiber - Google Patents
Single-mode high-power amplification device based on large-mode-field optical fiber Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/395—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves in optical waveguides
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02033—Core or cladding made from organic material, e.g. polymeric material
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
Abstract
The invention provides a single-mode high-power amplification device based on a large-mode-field optical fiber, which comprises a pumping source, a coupling lens group, a first dichroic mirror, a seed source, a collimating lens group and a second dichroic mirror, wherein the pumping source, the coupling lens group and the first dichroic mirror are sequentially arranged along the direction of a pumping light path, and the seed source, the collimating lens group and the second dichroic mirror are sequentially arranged along the direction of a seed light path, and the light paths are overlapped at. The seed light can meet the requirement of collimation and wall-free propagation in the fiber core of the large mode field gain optical fiber under a certain length after being collimated by the collimating lens group, the pump light forms a waveguide in the fiber core of the large mode field gain optical fiber under the action of the coupling lens group, the seed light cannot form waveguide transmission in the fiber core, good mode amplification output can be kept, and meanwhile, the waveguide transmission of the pump light can form extremely large gain for the seed light; the large-caliber large-mode-field gain optical fiber is adopted, so that the laser has a larger mode field area in the amplification process, the peak power of unit area is reduced, and the nonlinear effect of the optical fiber is suppressed.
Description
Technical Field
The invention relates to the technical field of optical fibers, in particular to a single-mode high-power amplification device based on a large-mode-field optical fiber.
Background
In the technical field of power amplification, the existing double-clad fiber adopts a fusion welding mode to realize full-fiber in the amplification process, but because the pumping light and the seed light form waveguide transmission and a lower mode field area in the fiber, serious nonlinear effect and poor mode output can be brought.
In order to overcome the above limitations to obtain high power and energy fiber output, rod-shaped photonic crystal fibers are widely used, particularly in the femtosecond fiber laser field. The rod-shaped photonic crystal fiber has a large mode field area and a special structure, so that laser keeps transmission of a fundamental mode in an amplification process, but the rod-shaped photonic crystal fiber cannot be bent due to the absence of a single-mode cut-off characteristic, the space compactness is greatly limited, and the price of the photonic crystal is quite high.
Compared with a rod-shaped photonic crystal fiber, the single crystal fiber has larger gain diameter and shorter length, and is a high-quality laser gain material because the single crystal fiber can ensure that the seed light is directly transmitted without touching the wall and is transmitted by a pump light waveguide. But is limited by narrow spectrum gain range of single crystal fiber and great difficulty in manufacturing process, and no high-quality single crystal fiber exists in China at present. The research on the single crystal fiber laser is limited to lower power and smaller energy, and only a few foreign research institutions have mature products.
Disclosure of Invention
The present invention provides a single mode high power amplification device based on a large mode field optical fibre which overcomes or at least partially solves the above mentioned problems.
The invention provides a single-mode high-power amplification device based on a large-mode-field optical fiber, which comprises a pumping source, a coupling lens group, a first dichroic mirror, a seed source, a collimating lens group and a second dichroic mirror, wherein the pumping source, the coupling lens group and the first dichroic mirror are sequentially arranged along the direction of a pumping light path; the pump light emitted by the pump source is focused by the coupling lens group and then transmits the first dichroic mirror, and enters the large mode field gain optical fiber to be transmitted to form a waveguide, the seed light emitted by the seed source is collimated by the collimating lens group and then transmits the second dichroic mirror, and enters the large mode field gain optical fiber to be transmitted in a collimating manner, the pump light and the collimated seed light which form the waveguide jointly act in the large mode field gain optical fiber to amplify the power of the seed light, and the seed light after power amplification is output by reflection of the dichroic mirror, so that the amplification of the seed light is completed.
The invention has the beneficial effects that: the seed light can meet the requirement of the collimation and wall-free propagation in the fiber core of the large mode field gain fiber under a certain length after being collimated by the collimating lens group, and the pump light forms a waveguide in the large mode field gain fiber under the action of the coupling lens group, so that the seed light can not form waveguide transmission and can keep good mode amplification output in the transmission mode, meanwhile, the waveguide transmission of the pump light can form great gain for the seed light, and the great amplification function of the fiber amplifier and the good laser mode and beam quality of the solid amplifier are integrated; the large-caliber large-mode-field gain optical fiber is adopted, so that the laser has a larger mode field area in the amplification process, and the peak power of unit area is reduced to play a role in inhibiting the nonlinearity of the optical fiber.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the optical device further comprises an isolator, wherein the isolator is arranged between the second dichroic mirror and the collimating lens group to prevent the pumping light or the reflected seed light from transmitting.
Further, the pumping source adopts a semiconductor laser, a solid laser or a fiber laser.
Furthermore, the coupling lens group is formed by combining two focusing lenses with focal lengths of 40mm and 150mm respectively, and is plated with an antireflection film of 976 nm.
Furthermore, the collimating lens group is formed by combining two focusing lenses with focal lengths of 500 mm.
Furthermore, the first dichroic mirror and the second dichroic mirror both adopt coated lenses or fiber gratings or fiber end mirrors, and the first dichroic mirror and the second dichroic mirror have high pass on wavelengths larger than 1000nm and are cut off wavelengths lower than 1000 nm.
Further, the seed source adopts optical fibers with different wavelengths or a solid laser light source.
Furthermore, the large mode field gain fiber comprises a large mode field gain fiber core, a cladding wrapped on the outer side of the large mode field gain fiber core, and a coating layer wrapped on the outer side of the large mode field gain fiber cladding, wherein the substrate of the large mode field gain fiber is made of quartz glass or multicomponent polymer.
Further, the seed source is a fiber core diameter D0The single mode fiber is 6um, the numerical aperture NA is 0.12, and the diameter 2 omega of the collimated light spot Gaussian beam waist is 500 um; the diameter D1 of large mode field gain fiber core is 800um, the diameter of cladding is 900um, and the diameter of coating is 1200 um.
Further, the maximum length of the large mode field gain fiber can be calculated by the following formula:
the length of the large mode field gain fiber selected by calculation does not exceed 33 cm.
Drawings
FIG. 1 is a schematic structural diagram of a single-mode high-power amplifying device based on a large-mode-field optical fiber according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a large mode field gain fiber;
fig. 3 is a schematic diagram of optical paths of the seed light and the pump light through the large mode field gain fiber.
In the drawings, the names of the components represented by the respective reference numerals are as follows:
101. the optical fiber comprises a pumping source, 102, a coupling lens group, 103, a first dichroic mirror, 104, a large mode field gain optical fiber, 105, a second dichroic mirror, 106, an isolator, 107, a collimating lens group, 108, a seed source, 201, a large mode field gain optical fiber core, 202, a large mode field gain optical fiber cladding, 203, a large mode field gain optical fiber coating layer, 204, pumping light propagating in the large mode field gain optical fiber, 205, and seed light propagating in the large mode field gain optical fiber.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the single-mode high-power amplification device based on the large mode field optical fiber according to one embodiment of the present invention includes a pump source 101, a coupling lens group 102, a first dichroic mirror 103, and a seed source 108, a collimating lens group 107, and a second dichroic mirror 105, which are sequentially arranged along a pump optical path direction, where the optical paths are overlapped at a large mode field gain optical fiber 104. The whole working principle of the whole device is as follows: the pumping light emitted by the pumping source 101 is focused by the coupling lens group 102 and then transmits the first dichroic mirror 103, and enters the large mode field gain fiber 104 to be propagated to form a waveguide, the seed light emitted by the seed source 108 is collimated by the collimating lens group 107 and then transmits the second dichroic mirror 105, and enters the large mode field gain fiber 104 to be propagated in a collimating manner, the power of the seed light is amplified through the combined action of the pumping light forming the waveguide and the collimated seed light in the large mode field fiber, and the seed light after power amplification is reflected and output through the dichroic mirror 103, so that the amplification of the seed light is completed.
In this embodiment, the seed light can meet the requirement of the collimated propagation without touching the wall in the large mode gain optical fiber core 201 under a certain length after being collimated by the collimating lens group 107, and the pump light forms a waveguide in the large mode gain optical fiber core 201 and the large mode gain optical fiber cladding 202 under the action of the coupling lens group 102, in this transmission mode, the seed light can not form waveguide transmission but collimated propagation in the large mode gain optical fiber 104, and can keep good mode amplification output, and meanwhile, the waveguide transmission of the pump light can form a great gain to the seed light, thereby integrating the great amplification function of the optical fiber amplifier and the good laser mode and beam quality of the solid amplifier; in addition, the use of the large mode field gain fiber 104 suppresses the nonlinear effects present in high power lasers.
On the basis of the above embodiments, in an embodiment of the present invention, an isolator 106 is further included, and the isolator 106 is disposed between the second dichroic mirror 105 and the collimating lens group 107 to prevent the pump light or the reflected seed light from being transmitted.
The isolator 106 is arranged between the second dichroic mirror 105 and the collimating lens group 107, the isolator 106 is mainly used for preventing the pumping light from entering the seed source 108 through the large mode field gain fiber 104, and the seed light is reflected by the second dichroic mirror 105 and enters the seed source 108, and the seed source 108 can be damaged by the irradiation of the pumping light and the seed light to the seed source 108, so that the isolator 106 is arranged between the second dichroic mirror 105 and the collimating lens group 107, and the function of protecting the seed source 108 is achieved.
On the basis of the above embodiments, in another embodiment of the present invention, the pump source 101 employs a semiconductor laser, a solid-state laser, or a fiber laser.
On the basis of the above embodiments, in an embodiment of the present invention, the coupling lens group 102 and the collimating lens group 107 may be a single lens group, or a combination of two or more lenses with different surface curvatures to achieve coupling or collimating effects. In a specific configuration, the coupling lens assembly 102 is formed by combining two focusing lenses with focal lengths of 40mm and 150mm, and an antireflection film of 976nm is coated outside the coupling lens assembly 102 to increase the transmission capability of the coupling lens assembly 102. The collimating lens group 107 is formed by combining two focusing lenses with focal lengths of 500mm, and can also be combined in other different ways to meet the collimating requirement.
On the basis of the above embodiments, in an embodiment of the present invention, the first dichroic mirror 103 and the second dichroic mirror 105 both use coated lenses or fiber gratings or fiber end mirrors, and the first dichroic mirror 103 and the second dichroic mirror 105 pass wavelengths greater than 1000nm and cut wavelengths less than 1000 nm.
In the present embodiment, the first dichroic mirror 103 and the second dichroic mirror 105 may act as high pass filters, i.e., large wavelength waves may pass, and small wavelength waves may not pass.
In another embodiment of the present invention, referring to fig. 2, based on the above embodiments, the large mode gain fiber 104 includes a large mode gain fiber core 201, a large mode gain fiber cladding 202 wrapped outside the large mode gain fiber core 201, and a large mode gain fiber coating layer 203 wrapped outside the large mode gain fiber cladding 202.
The matrix of the large mode field gain fiber 104 is quartz glass, multicomponent glass or multicomponent polymer, and the doped ions of the core of the large mode field gain fiber 104 are one or a combination of Yb, Nd, Er, Ho and Tm.
Based on the above embodiments, in one embodiment of the present invention, the seed source 108 uses optical fibers or solid laser light sources with different wavelengths. The seed source 108 adopts a single mode fiber, and the fiber core diameter D of the seed source 1080Is 6um, the numerical aperture NA is 0.12, and the collimated light spot Gaussian beam waist diameter 2 omega is 500 um. The diameter D1 of big mode field gain fiber 104 fibre core is 800um, and the diameter of big mode field gain fiber 104 cladding is 900um, the diameter of coating is 1200 um.
It should be noted that, after the seed light generated by the seed source 108 passes through the collimating lens group 107, although the seed light is collimated, the seed light can only pass through the core of the large mode field gain fiber 104 after entering a certain length of the large mode field gain fiber, and if the length of the large mode field gain fiber 104 is too large, it cannot be guaranteed that the seed light can propagate in a collimated manner. Therefore, the fiber parameters of the seed source 108 and the parameters of the large mode gain fiber 104 need to be designed and matched to achieve good effect. After the parameters of the seed source 108 are configured, the appropriate length of the large mode field gain fiber 104 can be determined according to the fiber parameters of the seed source 108 and the parameters of the large mode field gain fiber 104, and specifically, the maximum length of the large mode field gain fiber 104 can be calculated by the following formula:
and configuring the large mode field gain fiber 104 according to the calculated length, so as to meet the requirement that the seed light only propagates in the fiber core of the large mode field gain fiber 104 without touching the wall. On the basis of the above embodiments, the length of the large mode field gain fiber 104 calculated according to the above formula does not exceed 33 cm.
The transmission paths of the seed light and the pump light in the large mode field gain fiber are shown in fig. 3, and 976nm pump light emitted by the pump source 101 is focused by the coupling lens group 102 and then enters the large mode field gain fiber 104 through the 45 ° dichroic mirror 103 to form pump light 204 propagating in the large mode field gain fiber 104. The large mode field gain fiber 104 absorbs the pump light and provides sufficient population inversion. Meanwhile, the seed light emitted by the seed light element 108 is collimated by the collimating lens group 107, and the isolator 106 plays a role of preventing reverse light from protecting the seed source. The seed light filters the seed light-doped pump light by the second dichroic mirror 105. After entering the large mode field gain fiber 104, the seed light forms seed light 205 propagating in the large mode field gain fiber 104, stimulated radiation is initiated on the basis of population inversion, and the upper-level particles are reduced to the lower level to gain and amplify the seed signal light. The amplified seed signal light is reflected and output under the action of the first dichroic mirror 103, and amplification of the seed signal light is completed.
According to the single-mode high-power amplification device based on the large-mode-field optical fiber, the seed light can meet the requirement of the collimation and wall-collision-free propagation in the large-mode-field gain optical fiber core under a certain length after being collimated by the collimating lens group, the pump light forms a waveguide in the large-mode-field gain optical fiber under the action of the coupling lens group, the seed light can not form waveguide transmission and can keep good mode amplification output under the transmission mode, meanwhile, the waveguide transmission of the pump light can form great gain for the seed light, and the large amplification function of the optical fiber amplifier and the good laser mode and beam quality of the solid amplifier are integrated; the adopted large-caliber large-mode-field gain optical fiber ensures that laser has a larger mode field area in the amplification process, thereby reducing the peak power of unit area and playing a role in inhibiting the nonlinearity of the optical fiber; seed light is amplified and transmitted similarly to the wall-collision avoidance in solid amplification, so that the output has better laser mode and beam quality; the pumping light is transmitted similar to the waveguide in the optical fiber amplification, and the larger optical path enables the laser to obtain a larger gain coefficient, thereby playing a role in improving the output power of the optical fiber amplifier, in particular to the optical fiber pulse chirped amplifier in the ultrafast field.
In the embodiment of the invention, the traveling wave amplifier with a one-way backward pumping structure is selected, and the traveling wave amplifiers with other working modes, such as one-way forward pumping or one-way bidirectional pumping, and multi-pass amplifiers, such as laser structures comprising resonant cavities, regenerative amplifiers and the like, can be applied to the technology of the invention. In the amplifiers with different structures, the single-mode high-power amplification based on the large-mode-field optical fiber can be realized through the reasonable design of the seed source optical fiber parameters, the large-mode-field gain optical fiber parameters and the amplification optical path.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A single-mode high-power amplification device based on a large-mode-field optical fiber is characterized by comprising a pumping source, a coupling lens group, a first dichroic mirror, a seed source, a collimating lens group and a second dichroic mirror, wherein the pumping source, the coupling lens group and the first dichroic mirror are sequentially arranged along the direction of a pumping light path, and the seed source, the collimating lens group and the second dichroic mirror are sequentially arranged along the direction of a seed light path;
the pumping light emitted by the pumping source is focused by the coupling lens group, then transmits the first dichroic mirror, enters the large mode field gain optical fiber and is transmitted to form a waveguide, the seed light emitted by the seed source is collimated by the collimating lens group, then transmits the second dichroic mirror, enters the large mode field gain optical fiber and is transmitted in a collimating manner, the pumping light forming the waveguide and the collimated seed light act together in the large mode field gain optical fiber, the power of the seed light is amplified, the seed light after the power amplification is reflected and output by the dichroic mirror, and the amplification of the seed light is completed;
the diameter of the large mode field gain optical fiber core is larger than the diameter of the Gaussian beam waist of the collimated light spot.
2. The single-mode high power amplifying device according to claim 1, further comprising an isolator disposed between the second dichroic mirror and the collimating lens group to prevent transmission of the pump light or the reflected seed light.
3. The single mode high power amplification device of claim 1 wherein the pump source is a semiconductor laser, a solid state laser or a fiber laser.
4. The single mode high power amplifying device of claim 1, wherein said coupling lens group is formed by combining two focusing lenses with focal lengths of 40mm and 150mm, respectively, and said coupling lens group is coated with an antireflection film of 976 nm.
5. The single mode high power amplifier device of claim 2 wherein said collimating lens group is comprised of two focusing lenses each having a focal length of 500 mm.
6. The single-mode high power amplification device of claim 2, wherein the first dichroic mirror and the second dichroic mirror each employ coated lenses or fiber gratings or fiber end mirrors, the first dichroic mirror and the second dichroic mirror high pass wavelengths greater than 1000nm and cut wavelengths less than 1000 nm.
7. The single mode high power amplification device of claim 1 wherein the seed source employs optical fibers of different wavelengths or a solid state laser source.
8. The single-mode high-power amplification device of claim 1, wherein the large mode field gain fiber comprises a large mode field gain fiber core, a cladding layer wrapped outside the large mode field gain fiber core, and a coating layer wrapped outside the large mode field gain fiber cladding layer, and wherein the matrix of the large mode field gain fiber is made of silica glass or multicomponent polymer.
9. The single mode high power amplification device of claim 8 wherein the amplifier is a single mode amplifierThe seed source is the diameter D of the fiber core0The single mode fiber is 6um, the numerical aperture NA is 0.12, and the diameter 2 omega of the collimated light spot Gaussian beam waist is 500 um; the diameter D1 of large mode field gain fiber core is 800um, the diameter of cladding is 900um, and the diameter of coating is 1200 um.
10. The single mode high power amplification device of claim 9 wherein the maximum length of the large mode field gain fiber is calculated by the following equation:
the length of the large mode field gain fiber selected by calculation does not exceed 33 cm.
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