CN103280688A - End face protection structure of high-power laser optical fiber - Google Patents
End face protection structure of high-power laser optical fiber Download PDFInfo
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- CN103280688A CN103280688A CN2013101961232A CN201310196123A CN103280688A CN 103280688 A CN103280688 A CN 103280688A CN 2013101961232 A CN2013101961232 A CN 2013101961232A CN 201310196123 A CN201310196123 A CN 201310196123A CN 103280688 A CN103280688 A CN 103280688A
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Abstract
The invention discloses an end face protection structure of a high-power laser optical fiber. The end face protection structure comprises the high-power laser optical fiber and a glass block which is fused with one end of the high-power laser optical fiber, wherein one end, which is fused with the high-power laser optical fiber, of the glass block is of a cone structure; the cone end face is of a circular or polygonal structure; and the area of the end face is equal to or greater than the area of the optical fiber. According to the end face protection structure, as one piece of conical glass block is fused with the high-power laser optical fiber, the damage to the optical fiber caused by the over-high laser power density generated on the output face of the laser is prevented ; the taper of the glass block is greater than the divergence angle of a light beam output by the optical fiber, so that all lights output by optical fiber are transmitted inside the glass block; the size of the fine end of the glass block is small, so that the difficulty for fusion of the glass block and the optical fiber is reduced; the size of the end face of a thick end of the glass block is larger, so that an anti-reflection film is conveniently plated, and the unnecessary energy loss is reduced; and the structure is extremely suitable for the output end of the high-power optical fiber laser and is also suitable for a coupling input end or output end of a high-power semiconductor laser coupled with the optical fiber.
Description
Technical field
The invention belongs to laser device field, be specifically related to a kind of end face protection structure of high power laser light optical fiber.
Background technology
Fiber laser is because special gain waveguide structure, make high, the easily heat radiation of its gain, aspect the high power laser light of output high light beam quality its special advantages is being arranged, high-capacity optical fiber laser is used very extensive in fields such as national defence, industry at present, but because fiber core is too thin, the laser power density of transmission is high in the optical fiber, makes fiber end face occur damage easily, and this is in the development of high-capacity optical fiber laser and a major issue that faces in using.
There are some safeguard procedures can increase face area, output end face is realized certain protection at present; as a kind of method with the output of one section extremely short, consistent with fiber cladding diameter fused fiber splice to fiber laser; but this method is limited to the increase of face area, can not tackle the problem at its root.
Another kind method is that the columned glass blocks of a fritter and fiber end face are carried out welding, the output laser of fiber laser transfers in the air after being dissipated into large-size through columned glass blocks earlier again, laser power density on air and medium contact-making surface has obtained very big reduction, can effectively prevent output end face generation laser damage, but under this structure, the size of glass blocks and optical fiber differs bigger, is difficult to carry out high-quality welding, is not easy on the technology to realize.
Summary of the invention
The objective of the invention is to design a kind of end face protection structure of high power laser light optical fiber, can effectively reduce the laser power density of output end face, and realize easily on the technology, can guarantee repeatability and reliability, be suitable for industrialized large-scale production.
For achieving the above object, technical solution of the present invention is:
A kind of end face of high power laser light optical fiber protection structure comprises: high power laser light optical fiber and be fused to the glass blocks of this high power laser light optical fiber one end; Wherein, an end of described glass blocks and high power laser light fused fiber splice is cone structure, thin end and the fused fiber splice of cone structure, this carefully end face be shaped as circle or polygonized structure.
Further, the cone angle of described glass blocks cone structure is greater than the beam divergence angle of optical fiber output laser.
The described glass blocks cone structure carefully area of end face equals or is slightly larger than the optical fiber area.
The end that described glass blocks is thicker is cylinder or prism.
The end face of the end that described glass blocks is thicker is coated with the anti-reflection film that can reduce the end face reflection loss.
The end that described glass blocks is thicker is used as the output of fiber laser or laser output or the input of high power laser light coupling device, and the face area size of this end is greater than the laser spot size at this place.
Described high power laser light optical fiber is the used gain fibre of fiber laser, or is used for the passive energy-transmission optic fibre of laser output coupling.
The present invention has the following advantages:
1, the contact-making surface of laser transmission medium and air is bigger, and laser power density is low, can effectively avoid the end face damage.
2, adopt glass blocks and the optical fiber of band cone angle to carry out welding, because the size of the end that the glass blocks of band cone angle is thinner has reduced the welding difficulty, easier realization on the technology near fibre diameter, can guarantee repeatability and reliability, be suitable for industrialized large-scale production.
3, the end end face that the glass blocks of band cone angle is thicker is bigger, and plated film can effectively improve system effectiveness afterwards according to optical maser wavelength plating anti-reflection film easily.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
Fig. 2 is the structural representation of glass blocks embodiment one of the present invention.
Fig. 3 is the structural representation of glass blocks embodiment two of the present invention.
Fig. 4 is the structural representation of glass blocks embodiment three of the present invention.
Embodiment
Referring to Fig. 1～Fig. 4, the end face of high power laser light optical fiber of the present invention protection structure comprises: high power laser light optical fiber 1 and be fused to the glass blocks 2 of these high power laser light optical fiber 1 one ends; Described glass blocks 2 is cone structure with an end of high power laser light optical fiber 1 welding, thin end 21 and the fused fiber splice of cone structure, and this carefully holds 21 end surface shape can be circle, also can be processed as polygonized structure according to arts demand.
Further, the cone angle of described glass blocks 2 cone structures is greater than the beam divergence angle of optical fiber output laser.
The area of the thin end of described glass blocks 2 cone structures 21 end faces is equal to or greater than the optical fiber area.The end 22 that described glass blocks is thicker is cylinder or prism.
The end face of the end 22 that described glass blocks 2 is thicker is coated with the anti-reflection film that can reduce the end face reflection loss.
Described glass blocks 2 thicker ends 22 are used as the output of fiber laser or laser output or the input of high power laser light coupling device, and this end face size is greater than the laser spot size at this place.
Described high power laser light optical fiber 1 is the used gain fibre of fiber laser, or is used for the passive energy-transmission optic fibre of laser output coupling.
Fig. 1 is the preferable specific embodiment of the present invention one, high power laser light optical fiber adopts the LMA-YDF-20/400-M Yb-doped double-cladding optical fiber of Nufern, core diameter is 20 μ m, inner cladding diameter 400 μ m, numerical aperture 0.065, the glass blocks adopting quartz glass of band cone angle, cone angle is carefully held end face diameter 1mm, angle of taper 20, and conical surface partial-length is 11mm, the face of cylinder is processed in glass blocks butt end side, column part length is 5mm, end face diameter 8mm, laser transmission during to glass blocks butt end end face spot diameter near 1.4mm, the laser power density of end is compared and has been reduced nearly 5000 times in the optical fiber, has effectively avoided the laser damage of end face.
Referring to Fig. 2～Fig. 4, it is depicted as the various embodiment of glass blocks 2 of the present invention, and the butt end of glass blocks and thin end end face are processed into circle or square but are not limited to this face type, and polyhedral shape all can be processed in side, glass blocks two ends.
In sum, the present invention adopts glass blocks and the optical fiber of a band cone angle to carry out welding, the end size that glass blocks is thinner equals or is slightly larger than fibre diameter, be easier to carry out welding, the cone angle of glass blocks is greater than the acceptance angle of optical fiber, and laser can be dissipated into large-size and can not escape into outside the glass blocks in glass blocks, this structure can effectively reduce the laser power density of output end face, and realize easily on the technology, can guarantee repeatability and reliability, be suitable for industrialized large-scale production.
Claims (7)
1. the end face of high power laser light optical fiber protection structure comprises: high power laser light optical fiber and be fused to the glass blocks of this high power laser light optical fiber one end; It is characterized in that an end of described glass blocks and high power laser light fused fiber splice is cone structure, thin end and the fused fiber splice of cone structure, this carefully end face be circle or polygonized structure.
2. the end face of high power laser light optical fiber as claimed in claim 1 protection structure is characterized in that, the cone angle of described glass blocks cone structure is greater than the beam divergence angle of optical fiber output laser.
3. the end face of high power laser light optical fiber as claimed in claim 1 or 2 protection structure is characterized in that, the face area of the thin end of described glass blocks cone structure is equal to or greater than the optical fiber area.
4. as the end face protection structure of claim 1 or 2 or 3 described high power laser light optical fiber, it is characterized in that the end that described glass blocks is thicker is cylinder or prism.
5. as the end face protection structure of claim 1 or 2 or 3 or 4 described high power laser light optical fiber, it is characterized in that the end face of the end that described glass blocks is thicker is coated with the anti-reflection film that can reduce the end face reflection loss.
6. protect structure as the end face of claim 1 or 2 or 3 or 4 or 5 described high power laser light optical fiber; it is characterized in that; the end that described glass blocks is thicker is used as the output of fiber laser or laser output or the input of high power laser light coupling device, and the face size of this end is greater than the laser spot size at this place.
7. the end face of high power laser light optical fiber as claimed in claim 1 protection structure is characterized in that described high power laser light optical fiber is the used gain fibre of fiber laser, or is used for the passive energy-transmission optic fibre of laser output coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101961232A CN103280688A (en) | 2013-05-23 | 2013-05-23 | End face protection structure of high-power laser optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101961232A CN103280688A (en) | 2013-05-23 | 2013-05-23 | End face protection structure of high-power laser optical fiber |
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| CN103280688A true CN103280688A (en) | 2013-09-04 |
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| CN2013101961232A Pending CN103280688A (en) | 2013-05-23 | 2013-05-23 | End face protection structure of high-power laser optical fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959489A (en) * | 2017-05-25 | 2017-07-18 | 中国人民解放军国防科学技术大学 | A kind of high-power fiber end cap based on conical fiber |
| CN111404019A (en) * | 2020-03-30 | 2020-07-10 | 深圳活力激光技术有限公司 | Optical fiber coupling structure and method of high-power semiconductor laser |
| CN112859255A (en) * | 2019-11-28 | 2021-05-28 | 讯芯电子科技（中山）有限公司 | Optical communication module and manufacturing method thereof |
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| US6424765B1 (en) * | 1993-12-24 | 2002-07-23 | Agilent Technologies, Inc. | Optical device and method of making the same |
| CN201681171U (en) * | 2009-10-10 | 2010-12-22 | 空军大连通信士官学校 | Glass round table laser fiber coupler |
| CN102185244A (en) * | 2011-04-14 | 2011-09-14 | 福州高意通讯有限公司 | Method for manufacturing end face of high-power optical fiber laser |
| JP2013007959A (en) * | 2011-06-27 | 2013-01-10 | Sumitomo Electric Ind Ltd | End face processing method of optical fiber and terminal structure of optical fiber |
| CN202975389U (en) * | 2012-11-10 | 2013-06-05 | 广东汉唐量子光电科技有限公司 | High power optical fiber output head |
| CN203312620U (en) * | 2013-05-23 | 2013-11-27 | 纽敦光电科技（上海）有限公司 | End face protection structure of high-power laser optical fiber |
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2013
- 2013-05-23 CN CN2013101961232A patent/CN103280688A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6424765B1 (en) * | 1993-12-24 | 2002-07-23 | Agilent Technologies, Inc. | Optical device and method of making the same |
| CN201681171U (en) * | 2009-10-10 | 2010-12-22 | 空军大连通信士官学校 | Glass round table laser fiber coupler |
| CN102185244A (en) * | 2011-04-14 | 2011-09-14 | 福州高意通讯有限公司 | Method for manufacturing end face of high-power optical fiber laser |
| JP2013007959A (en) * | 2011-06-27 | 2013-01-10 | Sumitomo Electric Ind Ltd | End face processing method of optical fiber and terminal structure of optical fiber |
| CN202975389U (en) * | 2012-11-10 | 2013-06-05 | 广东汉唐量子光电科技有限公司 | High power optical fiber output head |
| CN203312620U (en) * | 2013-05-23 | 2013-11-27 | 纽敦光电科技（上海）有限公司 | End face protection structure of high-power laser optical fiber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959489A (en) * | 2017-05-25 | 2017-07-18 | 中国人民解放军国防科学技术大学 | A kind of high-power fiber end cap based on conical fiber |
| CN106959489B (en) * | 2017-05-25 | 2022-10-18 | 中国人民解放军国防科学技术大学 | High-power optical fiber end cap based on tapered optical fiber |
| CN112859255A (en) * | 2019-11-28 | 2021-05-28 | 讯芯电子科技（中山）有限公司 | Optical communication module and manufacturing method thereof |
| CN111404019A (en) * | 2020-03-30 | 2020-07-10 | 深圳活力激光技术有限公司 | Optical fiber coupling structure and method of high-power semiconductor laser |
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