CN214623105U - Optical fiber grating inscribing light path - Google Patents
Optical fiber grating inscribing light path Download PDFInfo
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- CN214623105U CN214623105U CN202120165699.2U CN202120165699U CN214623105U CN 214623105 U CN214623105 U CN 214623105U CN 202120165699 U CN202120165699 U CN 202120165699U CN 214623105 U CN214623105 U CN 214623105U
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Abstract
The utility model provides a fiber grating inscription light path, include: the device comprises an ultraviolet laser, a beam expander lens assembly, a diaphragm, a cylindrical lens assembly and a phase mask plate which are sequentially arranged along a light path; the ultraviolet laser is used for emitting ultraviolet laser, the beam expanding lens assembly is used for expanding the ultraviolet laser, the diaphragm is used for intercepting light spots after ultraviolet expansion, and the cylindrical lens assembly is used for adjusting focal length; the phase mask plate is used for writing fiber gratings on the fiber core. The utility model provides a fiber grating carves light path, through install ultraviolet laser in proper order on whole light path, beam expanding mirror subassembly, diaphragm, cylindrical mirror subassembly and phase place mask piece, use beam expanding mirror subassembly to expand the beam to high frequency deep ultraviolet laser, and through cylindrical mirror subassembly adjustment focal length, thereby light realization is adjusted high frequency ultraviolet laser's beam expansion multiple, it is unstable to have solved ultraviolet laser output facula, thereby the lens is very easily lost under high frequency ultraviolet laser irradiation influences the problem that fiber grating carved.
Description
Technical Field
The utility model relates to an optical communication field especially relates to a fiber grating inscription light path.
Background
The fiber grating is a phase grating which is formed by writing a light and shade pattern of incident light into a fiber core by using the photosensitivity of a fiber material through an ultraviolet light exposure method and generating a periodic distribution of refractive indexes along the axial direction of the fiber core in the fiber core, and the phase grating is used for forming a permanent space and is used for forming a narrow-band filter or a reflector in the fiber core. When one beam of broad spectrum light passes through the fiber grating, the light with the wavelength meeting the fiber grating Bragg condition is reflected, and the light with the other wavelengths is transmitted continuously through the fiber grating.
The most central to the fabrication of gratings is also the most expensive device, i.e. coherent laser, which should be chosen to be a deep ultraviolet coherent laser due to the special wavelength limitations of the photosensitive fiber. In order to obtain deep ultraviolet laser with very low wavelength, a coherent laser is required to carry out multiple frequency doubling and frequency combination, and crystals with large laser power loss are easy to damage in the process. In addition, in the process of obtaining ultraviolet laser by crystal frequency doubling, the temperature rise of the internal light passing direction can affect the light emitting efficiency of the whole laser.
The fabrication of fiber gratings applies to the most commonly used methods of phase masking. The phase mask plate is a diffraction optical device, and coherent light beams form +/-1-level light beams through the phase mask plate; then the + -1 order light beams interact to form uniformly spaced light and dark alternate stripes, so that corresponding periodic refractive index modulation can be written on the fiber core of the photosensitive optical fiber. The key of using the method to write the grating lies in the stability of the built writing light path, and the factor which has the greatest influence on the whole writing light path is the quality of the light spot of the coherent laser beam.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a fiber grating carves light path for it is unstable to solve ultraviolet laser output facula, thereby the lens is very easily lost under high frequency ultraviolet laser irradiation influences the problem that fiber grating carved and writes.
An embodiment of the utility model provides a fiber grating inscribes light path, include:
the device comprises an ultraviolet laser, a beam expander lens assembly, a diaphragm, a cylindrical lens assembly and a phase mask plate which are sequentially arranged along a light path;
the ultraviolet laser is used for emitting ultraviolet laser, the beam-expanding lens assembly is used for expanding the ultraviolet laser, the diaphragm is used for intercepting ultraviolet expanded light spots, and the cylindrical lens assembly is used for adjusting focal length; the phase mask plate is aligned to the fiber core of the optical fiber, and the ultraviolet laser is used for writing the fiber grating on the fiber core of the optical fiber.
According to the utility model discloses a fiber grating writes the light path, beam-expanding lens subassembly includes: a concave lens and a convex lens which are sequentially arranged along the light path;
the concave lens is used for receiving ultraviolet laser and refracting the ultraviolet laser; the convex lens is used for refracting the refracted ultraviolet laser into parallel ultraviolet laser.
According to the utility model discloses a fiber grating writes the light path, beam-expanding mirror assembly still includes: a spacing adjustment mechanism; the concave lens with convex lens all install on interval adjustment mechanism, interval adjustment mechanism is used for adjusting concave lens with convex lens's interval.
According to the utility model discloses a fiber grating inscription light path, cylindrical mirror subassembly includes: a cylindrical mirror; the cambered surface end of the cylindrical mirror is correspondingly installed with the emergent end of the diaphragm, and the straight surface end of the cylindrical mirror is correspondingly installed with the incident end of the phase mask plate.
According to the utility model discloses a fiber grating inscription light path, cylindrical mirror subassembly includes: a plurality of cylindrical mirrors installed in sequence;
and the emergent end of the diaphragm is correspondingly installed with the incident end of the phase mask plate through the plurality of cylindrical mirrors in sequence.
According to the fiber grating writing optical path of one embodiment of the present invention, the number of the cylindrical mirrors is two, which are respectively a first cylindrical mirror and a second cylindrical mirror;
the emergent end of the diaphragm is correspondingly installed with the cambered surface end of the first cylindrical mirror, the straight surface end of the first cylindrical mirror is correspondingly installed with the cambered surface end of the second cylindrical mirror, and the straight surface end of the second cylindrical mirror is correspondingly installed with the incident end of the phase mask plate.
According to the utility model discloses a fiber grating writes the light path, fiber grating writes the light path and still includes:
an optical fiber core clamp for securing the optical fiber core.
According to the utility model discloses a fiber grating writes the light path, fiber grating writes the light path and still includes:
and the mask plate clamp is used for fixing the phase mask plate.
According to the utility model discloses a fiber grating writes the light path, fiber grating writes the light path and still includes: a position adjustment mechanism; the optical fiber core is arranged on the position adjusting mechanism through the optical fiber core clamp, and the phase mask plate is arranged on the position adjusting mechanism through the mask plate clamp so as to adjust the distance between the optical fiber core and the phase mask plate.
The utility model provides a fiber grating carves light path, through install ultraviolet laser in proper order on whole light path, beam expanding mirror subassembly, diaphragm, cylindrical mirror subassembly and phase place mask piece, use beam expanding mirror subassembly to expand the beam to high frequency deep ultraviolet laser, and through cylindrical mirror subassembly adjustment focal length, thereby light realization is adjusted high frequency ultraviolet laser's beam expansion multiple, it is unstable to have solved ultraviolet laser output facula, thereby the lens is very easily lost under high frequency ultraviolet laser irradiation influences the problem that fiber grating carved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that 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 these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a fiber grating writing optical path according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a beam expander assembly provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of the phase mask method for forming bright and dark stripes to perform periodic refractive index modulation writing on the fiber core;
reference numerals:
1. an ultraviolet laser; 2. a beam expander assembly; 21. a concave lens; 22. a convex lens; 3. a diaphragm; 4. a cylindrical mirror assembly; 41. a first cylindrical mirror; 42. a second cylindrical mirror; 5. a phase mask plate; 6. the core of the optical fiber.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 embodiment of the utility model provides a fiber grating inscriptes light path, as shown in fig. 1, this fiber grating inscriptes light path includes: the device comprises an ultraviolet laser 1, a beam expander component 2, a diaphragm 3, a cylindrical mirror component 4 and a phase mask plate 5 which are sequentially arranged along a light path.
The ultraviolet laser 1 is generally a high-frequency deep ultraviolet solid laser for emitting ultraviolet laser. The beam expander component 2 is used for expanding the ultraviolet laser, expands the ultraviolet laser 1 facula to the size that we need and ultraviolet laser can reduce its divergence angle after expanding. The diaphragm 3 is used for intercepting light spots after ultraviolet expansion, and the cylindrical mirror assembly 4 is used for adjusting focal length. The phase mask 5 is aligned with the fiber core 6, and the fiber grating is inscribed on the fiber core 6 through ultraviolet laser.
In the process of carving light path processing, the required beam expansion multiple of the beam expansion mirror assembly 2 is adjusted at first, ultraviolet laser emitted by the ultraviolet laser 1 is expanded, the expanded light spot is intercepted by the diaphragm 3, and the expanded light spot uniform part is shaped by the small-hole diaphragm to obtain a light spot with uniform density and regular shape. And then, the adjustment of the focal length and the beam waist is realized through the cylindrical mirror assembly 4, and finally, the ultraviolet laser after shaping and focusing is irradiated on the fiber core of the optical fiber through the phase mask plate 5, so that the inscription of the optical fiber grating is realized. Finally, as shown in fig. 3, the adjusted light spot forms corresponding periodic refractive index modulation on the fiber core of the photosensitive fiber under the action of the phase mask plate, thereby realizing the manufacture of the fiber grating.
The embodiment of the utility model provides a fiber grating writes the light path, through install ultraviolet laser in proper order on whole light path, beam expanding mirror subassembly, diaphragm, cylindrical mirror subassembly and phase place mask piece, use beam expanding mirror subassembly to expand the beam to high frequency deep ultraviolet laser, and through cylindrical mirror subassembly adjustment focal length, thereby light realization is adjusted high frequency ultraviolet laser's beam expansion multiple, it is unstable to have solved ultraviolet laser output facula, thereby the lens is very easily lost under high frequency ultraviolet laser irradiation influences the problem that fiber grating write.
As shown in fig. 2, the beam expander lens assembly 2 includes: a concave lens 21 and a convex lens 22 installed in this order along the optical path. The concave lens 21 is used for receiving the ultraviolet laser light and refracting the ultraviolet laser light. The convex lens 22 is used for refracting the refracted ultraviolet laser light into parallel ultraviolet laser light.
For example, the incident aperture of the ultraviolet laser light emitted from the ultraviolet laser is di, the incident aperture is refracted by the concave lens 21 to enlarge the divergence angle θ of the ultraviolet laser light, the refracted ultraviolet laser light is refracted by the convex lens 22 to be parallel ultraviolet laser light, and the exit aperture of the emitted ultraviolet laser light is adjusted to d 0.
For ease of adjustment, the beam expander lens assembly 2 further comprises: a spacing adjustment mechanism; the concave lens 21 and the convex lens 22 are both mounted on a spacing adjusting mechanism, the spacing adjusting mechanism is used for adjusting the spacing between the concave lens 21 and the convex lens 22, and the spacing between the concave lens 21 and the convex lens 22 is controlled, so that the exit aperture is adjusted.
Similarly, in order to further realize the adjustment of the fiber grating writing process, the fiber grating writing light path can be additionally provided with a fiber core clamp and a mask clamp, and the fiber core clamp is used for fixing the fiber core 6. The mask plate holder is used to fix the phase mask plate 5. The optical fiber core 6 is arranged on the position adjusting mechanism through an optical fiber core clamp, and the phase mask plate 5 is arranged on the position adjusting mechanism through a mask plate clamp so as to adjust the distance between the optical fiber core 6 and the phase mask plate 5, thereby realizing the adjustment of the forming position of the optical fiber grating.
The cylindrical mirror assembly 4 includes: a cylindrical mirror; the cambered surface end of the cylindrical mirror is correspondingly installed with the ejection end of the diaphragm 3, and the straight surface end of the cylindrical mirror is correspondingly installed with the ejection end of the phase mask plate 5.
Generally, a cylindrical mirror assembly includes: a plurality of cylindrical mirrors installed in sequence. The emergent end of the diaphragm 3 is correspondingly installed with the incident end of the phase mask plate 5 through a plurality of cylindrical mirrors in sequence.
In the present embodiment, the number of the cylindrical mirrors is two, and the number is the first cylindrical mirror 41 and the second cylindrical mirror 42. The emergent end of the diaphragm 3 is correspondingly installed with the cambered surface end of the first cylindrical mirror 41, the straight surface end of the first cylindrical mirror 41 is correspondingly installed with the cambered surface end of the second cylindrical mirror 42, and the straight surface end of the second cylindrical mirror 42 is correspondingly installed with the incident end of the phase mask plate 5.
And focusing the obtained uniform light spots with regular shapes twice by using two cylindrical mirrors. The focal length and the Rayleigh length of the light spot can be easily adjusted by adjusting the focal length and the distance between the two cylindrical mirrors.
Specifically, in the process of processing the writing optical path, as shown in fig. 2, the beam expansion multiple required by the beam expander assembly 2 is adjusted, the ultraviolet laser emitted by the ultraviolet laser 1 is refracted by the concave lens 21, and then the refracted ultraviolet laser is refracted by the convex lens 22 into parallel ultraviolet laser. And intercepting the expanded light spot by using the diaphragm 3, and shaping the uniform part of the expanded light spot by using the small-hole diaphragm to obtain the light spot with uniform density and regular shape. Then, the obtained uniform light spot with a regular shape is focused twice by using the first cylindrical mirror 41 and the second cylindrical mirror 42 and using the two cylindrical mirrors. The focal length and the Rayleigh length of the light spot can be easily adjusted by adjusting the focal length and the distance between the two cylindrical mirrors. Finally, the ultraviolet laser after shaping and focusing is irradiated on the fiber core of the optical fiber through the phase mask plate 5, so that the writing of the optical fiber grating is realized. In the working process of the phase mask method, as shown in fig. 3, coherent laser after shaping and focusing irradiates an incident surface of a phase mask plate to form +/-1-level light beams, 0-level light is suppressed, the +/-1-level light beams interact to form light and dark alternate stripe light beams, an optical fiber subjected to sensitization processing is placed in the light and dark stripes for exposure, and corresponding axial periodic refractive index modulation can be written in a fiber core, so that the manufacturing of the optical fiber grating is realized.
To sum up, the embodiment of the utility model provides a fiber grating writes the light path, through install ultraviolet laser, beam expanding mirror subassembly, diaphragm, cylindrical mirror subassembly and phase place mask plate in proper order on whole light path, use beam expanding mirror subassembly to expand the beam of high frequency deep ultraviolet laser to through cylindrical mirror subassembly adjustment focal length, thereby light realization is adjusted high frequency ultraviolet laser's beam expansion multiple, has solved ultraviolet laser output facula unstability, thereby the lens is very easily lost under high frequency ultraviolet laser irradiation influences the problem that fiber grating writes.
In addition, the structure can effectively improve the influence of unstable laser beam spots on the whole FBG writing system caused by the thermally induced phase mismatch of the deep ultraviolet crystal. The structure has the advantages that the obtained light spot is high in quality, the focused effect is very good, the FBG (Fiber Bragg Grating) writing requirement of the large-Fiber-diameter multimode optical Fiber can be met only by very low irradiation, and meanwhile, the damage of deep ultraviolet wavelength to common optical crystals and lenses is reduced, so that the replacement frequency of expensive crystals and lenses in the manufacturing process of the optical Fiber Grating and the maintenance cost of a platform are reduced. Meanwhile, the fiber bragg grating writing light path can be applied to an FBG (fiber Bragg grating) writing system of large-fiber-diameter multimode fibers, the practicability is high, and the writing performance is obviously improved.
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 (9)
1. A fiber grating writing optical path, comprising:
the device comprises an ultraviolet laser, a beam expander lens assembly, a diaphragm, a cylindrical lens assembly and a phase mask plate which are sequentially arranged along a light path;
the ultraviolet laser is used for emitting ultraviolet laser, the beam-expanding lens assembly is used for expanding the ultraviolet laser, the diaphragm is used for intercepting ultraviolet expanded light spots, and the cylindrical lens assembly is used for adjusting focal length; the phase mask plate is aligned to the fiber core of the optical fiber, and the ultraviolet laser is used for writing the fiber grating on the fiber core of the optical fiber.
2. The fiber grating writing optical path according to claim 1, wherein the beam expander assembly comprises: a concave lens and a convex lens which are sequentially arranged along the light path;
the concave lens is used for receiving ultraviolet laser and refracting the ultraviolet laser; the convex lens is used for refracting the refracted ultraviolet laser into parallel ultraviolet laser.
3. The fiber grating writing optical path of claim 2, wherein the beam expander assembly further comprises: a spacing adjustment mechanism; the concave lens with convex lens all install on interval adjustment mechanism, interval adjustment mechanism is used for adjusting concave lens with convex lens's interval.
4. The fiber grating writing optical path of claim 1, wherein the cylindrical mirror assembly comprises: a cylindrical mirror; the cambered surface end of the cylindrical mirror is correspondingly installed with the emergent end of the diaphragm, and the straight surface end of the cylindrical mirror is correspondingly installed with the incident end of the phase mask plate.
5. The fiber grating writing optical path of claim 1, wherein the cylindrical mirror assembly comprises: a plurality of cylindrical mirrors installed in sequence;
and the emergent end of the diaphragm is correspondingly installed with the incident end of the phase mask plate through the plurality of cylindrical mirrors in sequence.
6. The fiber bragg grating writing optical path according to claim 5, wherein the number of the cylindrical mirrors is two, and the two cylindrical mirrors are a first cylindrical mirror and a second cylindrical mirror respectively;
the emergent end of the diaphragm is correspondingly installed with the cambered surface end of the first cylindrical mirror, the straight surface end of the first cylindrical mirror is correspondingly installed with the cambered surface end of the second cylindrical mirror, and the straight surface end of the second cylindrical mirror is correspondingly installed with the incident end of the phase mask plate.
7. The fiber grating writing optical path according to claim 1, further comprising:
an optical fiber core clamp for securing the optical fiber core.
8. The fiber grating writing optical path according to claim 7, further comprising:
and the mask plate clamp is used for fixing the phase mask plate.
9. The fiber grating writing optical path according to claim 8, further comprising: a position adjustment mechanism; the optical fiber core is arranged on the position adjusting mechanism through the optical fiber core clamp, and the phase mask plate is arranged on the position adjusting mechanism through the mask plate clamp so as to adjust the distance between the optical fiber core and the phase mask plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120165699.2U CN214623105U (en) | 2021-01-21 | 2021-01-21 | Optical fiber grating inscribing light path |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120165699.2U CN214623105U (en) | 2021-01-21 | 2021-01-21 | Optical fiber grating inscribing light path |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900176A (en) * | 2021-12-10 | 2022-01-07 | 之江实验室 | Immersed multi-core fiber grating inscribing device |
| CN116381952A (en) * | 2023-05-19 | 2023-07-04 | 西安炬光科技股份有限公司 | Optical shaping assembly, optical system and laser radar |
-
2021
- 2021-01-21 CN CN202120165699.2U patent/CN214623105U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900176A (en) * | 2021-12-10 | 2022-01-07 | 之江实验室 | Immersed multi-core fiber grating inscribing device |
| CN116381952A (en) * | 2023-05-19 | 2023-07-04 | 西安炬光科技股份有限公司 | Optical shaping assembly, optical system and laser radar |
| CN116381952B (en) * | 2023-05-19 | 2023-09-12 | 西安炬光科技股份有限公司 | Optical shaping assembly, optical system and laser radar |
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