CN214954199U - Double-cladding energy transmission optical fiber and high-power optical fiber laser - Google Patents
Double-cladding energy transmission optical fiber and high-power optical fiber laser Download PDFInfo
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- CN214954199U CN214954199U CN202120651453.6U CN202120651453U CN214954199U CN 214954199 U CN214954199 U CN 214954199U CN 202120651453 U CN202120651453 U CN 202120651453U CN 214954199 U CN214954199 U CN 214954199U
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Abstract
The utility model provides a double-clad passes can optic fibre and high power fiber laser relates to laser technical field. The double-cladding energy-transmitting optical fiber comprises a fiber core, an inner cladding and an outer cladding, wherein the fiber core, the inner cladding and the outer cladding are sequentially arranged from inside to outside, the fiber core is a quartz core, the inner cladding and the outer cladding are fluorine-doped quartz layers, the refractive index of the fiber core is larger than that of the inner cladding, the refractive index of the inner cladding is larger than that of the outer cladding, and the numerical aperture of the fiber core is smaller than that of the inner cladding. The utility model provides a double-clad passes can optic fibre and high power fiber laser, fibre core adopt quartzy, and inner cladding and surrounding layer adopt respectively to mix fluorine quartz, and the refracting index of each layer reduces from inside to outside gradually in the optic fibre, forms the refraction difference, reduces the loss.
Description
Technical Field
The utility model relates to a laser technical field especially relates to a double-clad biography can optic fibre and high power fiber laser.
Background
The semiconductor laser output by the optical fiber is used as a pumping source applied to the optical fiber laser and is a key device of the optical fiber laser. The semiconductor laser chip emits light, needs to be subjected to beam shaping through various lenses and is coupled to the optical fiber for output. The output optical fiber of the semiconductor laser is welded in the passive device, so that the pump light enters the gain optical fiber. At present, the power of the fiber laser is higher and higher, and the demand for the pump power is also higher and higher. The power and brightness of the single module of the pump source are greatly improved correspondingly.
However, the beam combiner corresponding to the semiconductor laser has a certain loss. For example, the loss of 5% of pump light of 100W is 5W; for 200W of pump light, the loss is 10W at 5%. If excessive losses occur in the passive device, it may heat up and even fail. This loss is related to the numerical aperture of the semiconductor laser, in addition to the performance of the beam combiner itself.
Under the condition of a certain fiber core diameter, the numerical aperture of the pumping source needs to be lower, so that excessive loss of the beam combiner can be avoided. At present, the numerical aperture of mainstream optical fibers is 0.22, and the mainstream optical fibers are divided into a single cladding and a double cladding. The refractive index of the coating layer of the single-clad optical fiber is high, and cladding light can leak to the coating layer; the double-clad optical fiber adopts a coating layer with low refractive index, and partial light with the numerical aperture larger than 0.22 is transmitted in the cladding. If the numerical aperture of the pump source is 0.18, then if there is a small deviation in the coupling, light with a numerical aperture between 0.18 and 0.22 will be transmitted in the core, stressing the combiner.
SUMMERY OF THE UTILITY MODEL
The utility model provides a double-clad can optic fibre and high power fiber laser for solve among the prior art defect that double-clad can optic fibre loss is big.
The utility model provides a double-clad passes can optic fibre, including fibre core, inner cladding and surrounding layer, the fibre core the inner cladding with the surrounding layer is by interior setting in order to outer, the fibre core is the quartz core, the inner cladding with the surrounding layer is the fluorine-doped quartz layer, the refracting index of fibre core is greater than the refracting index of inner cladding, the refracting index of inner cladding is greater than the refracting index of surrounding layer, the numerical aperture of fibre core is less than the numerical aperture of inner cladding.
According to the double-cladding energy transmission optical fiber provided by the utility model, the numerical aperture of the fiber core is 0.12-0.22; the numerical aperture of the inner cladding is 0.2-0.4.
According to the utility model provides a pair of double-clad passes can optic fibre, the refracting index of fibre core is 1.44 ~ 1.46.
According to the utility model provides a pair of cladding passes can optic fibre, the core footpath of fibre core is not less than 100 mu m.
According to the utility model provides a pair of double-clad biography can optic fibre still includes the coating, the coating cladding is in the outside of surrounding layer.
The utility model also provides a high power fiber laser, including passive device and as above the double-clad biography can optic fibre, the output of double-clad biography can optic fibre fuse in passive device.
The utility model provides a double-clad passes can optic fibre and high power fiber laser, fibre core adopt quartzy, and inner cladding and surrounding layer adopt respectively to mix fluorine quartz, and the refracting index of each layer reduces from inside to outside gradually in the optic fibre, forms the refraction difference, reduces the loss.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a double-clad energy-transmitting optical fiber provided by the present invention;
reference numerals:
10: a fiber core; 20: an inner cladding; 30: an outer cladding;
40: and coating the layer.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The structure of the double-clad energy-transmitting optical fiber provided by the present invention is described below with reference to fig. 1.
The utility model provides a double-clad energy-transfer optical fiber, as shown in figure 1, it includes fibre core 10, inner cladding 20 and surrounding layer 30, and fibre core 10, inner cladding 20 and surrounding layer 30 set up from inside to outside in order. Specifically, the core 10 is a quartz core, and the inner cladding 20 and the outer cladding 30 are fluorine-doped quartz layers. The refractive index n1 of the core 10 is greater than the refractive index n2 of the inner cladding 20, and the refractive index n2 of the inner cladding 20 is greater than the refractive index n3 of the outer cladding 30, i.e., n1> n2> n 3. The numerical aperture of the core 10 is smaller than the numerical aperture of the inner cladding 20.
The fluorine doping amount of the inner cladding 20 and the outer cladding 30 is determined according to the refractive index of the inner cladding and the outer cladding, as long as the refractive index satisfies n1> n2> n 3.
The utility model provides a double-clad passes can optic fibre, fibre core 10 adopt quartzy, and inner cladding 20 and surrounding layer 30 adopt respectively to mix fluorine quartz, and the refracting index of each layer reduces from inside to outside gradually in the optic fibre, forms the refraction difference, reduces the loss.
Specifically, the numerical aperture of the core 10
Numerical aperture of inner cladding 20
For example, if the pump source design index is 0.18NA, the numerical aperture of the core 10 is 0.18NA, and the numerical aperture of the inner cladding 20 is 0.22NA, so that light within 0.18NA is transmitted in the core 10. In the light transmission process, light between 0.18NA and 0.22NA can be transmitted between the inner cladding 20 and the outer cladding 30, and before entering the passive device, the inner cladding 20 is stripped, so that the light between 0.18NA and 0.22NA can not enter the passive device, and the passive device can not generate heat. Wherein light greater than 0.22NA enters the outer cladding 30 and is scattered out.
In one embodiment, the numerical aperture of the core 10 is 0.18 and the numerical aperture of the inner cladding is 0.22. And the numerical aperture of the core 10
Numerical aperture of inner cladding 20
The 900nm wavelength index of the core 10 is 1.451178, as calculated by the formula, the index of the inner cladding 20 is 1.44 and the index of the outer cladding 30 is 1.4346. The double-cladding energy-transmitting optical fiber is arranged on a 400-500W high-power semiconductor laser, and the numerical aperture of output light is 0.18 NA.
In another embodiment, the numerical aperture of the core 10 is 0.16 and the inner cladding numerical aperture is 0.22. The 900nm wavelength index of the core 10 is 1.451178 based on the numerical aperture calculation of the core 10 and the inner cladding 20, where the index of the inner cladding is 1.442331 and the index of the outer cladding is 1.4316. The double-cladding energy-transmitting optical fiber is arranged on a 300-400W high-power semiconductor laser, and the numerical aperture of output light is 0.16 NA.
In the embodiment of the present invention, the core diameter of the fiber core 10 is not less than 100 μm. The double-clad energy transmission fiber is a multimode fiber.
The double-clad energy-transmitting optical fiber further includes a coating layer 40, and the coating layer 40 is coated outside the outer cladding layer 30.
In addition, the embodiment of the utility model provides a high power fiber laser is still provided, including passive device and as above double-clad biography can optic fibre, the output butt fusion of double-clad biography can optic fibre connects in passive device.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (6)
1. The double-clad energy-transmitting optical fiber comprises a fiber core, an inner cladding and an outer cladding, wherein the fiber core, the inner cladding and the outer cladding are sequentially arranged from inside to outside.
2. The double-clad energy-transmitting optical fiber according to claim 1, wherein the numerical aperture of the core is 0.12 to 0.22; the numerical aperture of the inner cladding is 0.2-0.4.
3. The double-clad energy transmitting fiber according to claim 2, wherein the refractive index of the core is 1.44 to 1.46.
4. The double-clad energy transmitting fiber according to claim 1, wherein the core diameter of the core is not less than 100 μm.
5. The double-clad energy transmitting optical fiber according to claim 1, further comprising a coating layer coated outside the outer cladding.
6. A high power fibre laser comprising a passive device and a double clad energy transmitting fibre as claimed in any one of claims 1 to 5, the output end of the double clad energy transmitting fibre being fused to the passive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120651453.6U CN214954199U (en) | 2021-03-30 | 2021-03-30 | Double-cladding energy transmission optical fiber and high-power optical fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120651453.6U CN214954199U (en) | 2021-03-30 | 2021-03-30 | Double-cladding energy transmission optical fiber and high-power optical fiber laser |
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| Publication Number | Publication Date |
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| CN214954199U true CN214954199U (en) | 2021-11-30 |
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| CN202120651453.6U Active CN214954199U (en) | 2021-03-30 | 2021-03-30 | Double-cladding energy transmission optical fiber and high-power optical fiber laser |
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