CN115993726A - Optical system, special optical fiber growth device and method thereof - Google Patents
Optical system, special optical fiber growth device and method thereof Download PDFInfo
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- CN115993726A CN115993726A CN202310111361.2A CN202310111361A CN115993726A CN 115993726 A CN115993726 A CN 115993726A CN 202310111361 A CN202310111361 A CN 202310111361A CN 115993726 A CN115993726 A CN 115993726A
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Abstract
The invention provides an optical system, a special optical fiber growing device and a method thereof. The optical system is applied to a special optical fiber growing device and comprises a carbon dioxide laser, a beam shaper and a lens assembly. The carbon dioxide laser is used for emitting laser. The beam shaper is positioned on the outgoing beam path of the carbon dioxide laser and is used for converting the Gaussian beam of the laser into the beam with the intensity distribution of the Airy spot. The lens assembly is positioned on the outgoing beam path of the beam shaper and is used for adjusting the focal plane position of the beam so as to focus the beam to the top end of the prefabricated source rod of the special optical fiber growing device. The reflection assembly is positioned in the optical path between the carbon dioxide laser and the preform source rod and is used for adjusting the direction of the light beam so as to focus the light beam to the top end of the preform source rod in a reflection way. The invention can solve the problems of complicated light path adjustment, difficult quantification of uniformity of annular light spots and the like in the process of preparing the laser heating base.
Description
Technical Field
The invention relates to the technical field of optical fiber material preparation, in particular to an optical system, a special optical fiber growth device and a method thereof.
Background
By special optical fiber is meant a special purpose optical fiber that is distinguished from the special properties and uses of international communications standard optical fibers, such as: single crystal optical fibers, multicomponent glass optical fibers, plastic optical fibers, photonic crystal optical fibers, and the like. The special optical fiber has special material components, structural design, transmission wavelength, optical performance, mechanical performance and environmental performance, so that the preparation method is greatly different from the traditional quartz optical fiber. In the mainstream special optical fiber preparation method, laserThe heating susceptor method (Laser-Heated Pedestal Growth, LHPG) uses carbon dioxide (CO 2 ) The laser is used as an ultra-clean heat source to heat the top end of the prefabricated source rod to form a high-temperature melting area, one end of the seed optical fiber is placed into the melting area, and the seed optical fiber is pulled upwards to grow the optical fiber. This is the only way to grow high quality hundred micron diameter single crystal optical fibers. Since the quality of the grown optical fiber depends largely on the uniformity of the heated region, the growth process is continuously improved from the proposal of the LHPG technique in order to form a more uniform heated region, thereby improving the quality of the manufactured optical fiber.
In the original LHPG system, a laser is utilized to directly converge and laterally heat the top end of a prefabricated source rod to form a melting area, and then a seed optical fiber is put into the melting area to lift and grow the optical fiber upwards. However, since the laser light source is converged from one side to cause heating unevenness, the grown optical fiber diameter is affected. In order to improve the heating uniformity of the melting area of the prefabricated source rod, the other mode is to divide the same laser beam into two beams, even four beams, and the laser beams are converged to the top end of the prefabricated source rod from the symmetrical direction so as to improve the heating uniformity. In the LHPG system which is gradually optimized and developed into the current mainstream in the mode, the optical path design scheme is formed that original laser with Gaussian distribution is converted into annular laser with the diameter of about 50mm to 70mm by utilizing a biconical lens group, then the annular laser is reflected by a reflecting mirror with a middle hole at 45 degrees, an arc-shaped focusing mirror with the middle hole is irradiated in parallel, and then the annular laser is converged into annular light spots by the arc-shaped focusing mirror. The optical fiber and the prefabricated source rod penetrate through the reflecting mirror and the arc-shaped focusing mirror. In order to uniformly distribute the annular light spots converged at the top end of the prefabricated source rod in intensity, the optical precision requirements of the four lenses are quite high, and the adjustment of the four mirrors is also quite high.
The current mainstream LHPG technical scheme has a plurality of light path adjustment degrees of freedom, and the light path adjustment process is complicated. Because of the large size of the annular light spot, uniformity of the annular light spot is not easy to quantify, and therefore, the optical fiber needs to be manually adjusted and corrected frequently in the growth process of the optical fiber, and a simplified optical path design is urgently needed.
Disclosure of Invention
The invention aims to provide an optical system, a special optical fiber growing device and a method thereof, which can solve the problems of complicated light path adjustment, difficulty in quantifying uniformity of annular light spots and the like in the process of preparing a laser heating base method.
One aspect of the present invention provides an optical system for use in a specialty fiber growth apparatus. The optical system comprises a carbon dioxide laser, a beam shaper, a lens assembly and a reflecting assembly. The carbon dioxide laser is used for emitting laser. The beam shaper is positioned on an emergent beam path of the carbon dioxide laser and is used for converting a Gaussian beam of laser into a beam with an Airy spot intensity distribution. The lens component is positioned on the outgoing beam path of the beam shaper and is used for adjusting the focal plane position of the beam so as to focus the beam to the top end of a prefabricated source rod of the special optical fiber growing device. The reflection assembly is positioned in an optical path between the carbon dioxide laser and the preform source rod and is used for adjusting the direction of the light beam so as to reflect the light beam to the top end of the preform source rod.
Another aspect of the invention provides a special fiber growth apparatus. The special optical fiber growing device comprises the optical system, the prefabricated source rod, the seed optical fiber, the feeding system and the lifting device. The seed optical fiber is placed in a melting area at the top end of the prefabricated source rod. The feed system is used to deliver the preform source rod upward during the growth of the specialty fiber. The lifting device is used for lifting the grown special optical fiber upwards in the growth process of the special optical fiber.
The invention also provides a special optical fiber growth method. The special optical fiber growth method comprises the following steps: emitting laser by using a carbon dioxide laser; converting the Gaussian beam of the laser into a beam with an Airy spot intensity distribution using a beam shaper; and adjusting the focal plane position of the light beam and the direction of the light beam to reflect and focus the light beam to the top end of the prefabricated source rod, so as to form an annular heating area to realize the growth of the special optical fiber.
The invention has the beneficial effects that:
1. the invention adopts laser to heat the optical fiber raw material, and can greatly reduce the introduction of impurities in the growth process of the special optical fiber. The diameter of the special optical fiber can be regulated and controlled in real time by changing the ratio of the rod feeding speed of the prefabricated source rod to the pulling speed of the special optical fiber in the growth process of the special optical fiber.
2. The process manufacturing method is simple and efficient, and does not need a complex light path adjusting flow. Because the traditional LHPG technical scheme is to convert the Gaussian beam into the annular beam and focus the annular beam to the top end of the prefabricated source rod, the symmetry requirement on the annular beam is good, and the central positions of the annular beam and the optical axis are not coincident, so that the complexity of optical path adjustment is increased. The growth method of the invention directly focuses the light beam with the intensity distribution of 'Airy spot', and the complex beam space shaping process is not needed.
3. The special optical fiber growth method is more flexible. The working distance of the system can be flexibly adjusted according to the length of the special optical fiber to be grown.
4. The invention is beneficial to improving the light energy utilization rate, adopts a plane reflector to replace a parabolic mirror used in the traditional LHPG technology, is beneficial to reducing aberration, ensures that energy is more concentrated in the central area of a thermal field, and reduces the outward dispersion of the energy of a central light spot.
Drawings
Fig. 1 is a schematic structural view of an optical system applied to a special optical fiber growing apparatus according to a first embodiment of the present invention.
Fig. 2 is a schematic structural view of an optical system applied to a special optical fiber growing device according to a second embodiment of the present invention.
Fig. 3 is a graph showing the comparison of the intensity distribution of laser light before and after passing through the beam shaper according to the embodiment of the present invention, wherein a is a gaussian beam intensity distribution before passing through the beam shaper, and b is an airy disk intensity distribution obtained after passing through the beam shaper.
Fig. 4 is a flow chart of a special fiber growth method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with aspects of the invention as detailed in the accompanying claims.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used in the embodiments of the present invention should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present invention belongs.
The embodiment of the invention provides a special optical fiber growing device. The special optical fiber growing device comprises an optical system, a prefabricated source rod, a seed optical fiber, a feeding system 50 and a lifting device 60. The seed optical fiber is placed in a fusion zone at the top end of the preform. The feed system 50 may be used to deliver the preform source upward during the growth of the specialty fiber. The pulling device 60 may be used to pull the grown specialty fiber upward during the growth of the specialty fiber.
The specialty fibers may include, for example, but are not limited to, single crystal fibers, photonic crystal fibers, glass fibers, plastic fibers, or multifunctional fibers, among others.
The embodiment of the invention provides two optical systems applied to a special optical fiber growth device, which can overcome the defects of the prior art and solve the problems of complicated optical path adjustment, difficulty in quantifying the uniformity of annular light spots and the like in the preparation process of a laser heating base method (LHPG).
Fig. 1 discloses a schematic structure of an optical system 10 applied to a special optical fiber growing apparatus according to a first embodiment of the present invention. As shown in fig. 1, an optical system 10 of an embodiment of the present invention includes carbon dioxide (CO 2 ) A laser 11, a beam shaper 12, a lens assembly 13 and a reflecting assembly 15. The carbon dioxide laser 11 may be used to emit laser light. In some embodiments, the carbon dioxide laser 11 has a center wavelength of 10.57-10.63 μm. In another oneIn some embodiments, the carbon dioxide laser 11 has a center wavelength of 10.6 μm. In some embodiments, the type of laser emitted by the carbon dioxide laser 11 may include a continuous laser or a quasi-continuous laser.
In this embodiment, the beam waist diameter of the laser light emitted from the carbon dioxide laser 11 is 2.5mm, the beam quality M2<1.25, the center wavelength is 10.6 μm, the average power is 25W, the power stability is <1%, and the laser type is continuous laser light.
The beam shaper 12 is located in the outgoing beam path of the carbon dioxide laser 11. The beam shaper 12 is an afocal optical system 10 that can be used to convert a gaussian beam of laser light into a beam of "airy" intensity distribution, and the spot size and divergence angle of the output beam is consistent with the input beam. A gaussian beam refers to an electromagnetic wave beam whose transverse electric field and irradiance distribution approximately satisfy a gaussian function. Airy disk refers to the diffraction pattern produced by a uniformly illuminated circular aperture.
Fig. 3 shows a comparison of the intensity distribution of laser light before and after passing through the beam shaper 12 according to an embodiment of the present invention, where a is a gaussian beam intensity distribution before passing through the beam shaper 12 and b is an airy disk intensity distribution obtained after passing through the beam shaper 12.
A lens assembly 13 is positioned in the path of the outgoing beam from the beam shaper 12 and can be used to adjust the focal plane position of the beam to focus the beam onto the top end of the preform source rod 30 of the specialty fiber growth device.
A reflecting assembly 15 is positioned in the optical path between the carbon dioxide laser 11 and the preform source 30 for adjusting the direction of the light beam to focus the light beam reflection onto the top end of the preform source 30.
The optical system 10 of the embodiment of the invention can convert Gaussian beams into beams with 'Airy spot' intensity distribution and then focus the beams to form a uniform annular heating area, thereby avoiding the problem of complex optical path adjustment process caused by conversion into annular light spots and greatly improving the growth efficiency of the special optical fiber 40.
In the embodiment shown in fig. 1, the optical system 10 of the present invention further comprises an aspherical lens 14. The aspheric lens 14 is located between the carbon dioxide laser 11 and the beam shaper 12, and can be used for collimating the laser emitted from the carbon dioxide laser 11 into parallel light and then making the parallel light enter the beam shaper 12, and adjusting the spot diameter size of the parallel light to be matched with the incident aperture of the beam shaper 12.
In one embodiment, the material of the aspherical lens 14 includes ZnSe, and the coating range of the aspherical lens 14 is 7-12 μm for antireflection and high transmission to the laser light emitted from the carbon dioxide laser 11. The focal length of the aspherical lens 14 was 40mm and the numerical aperture NA was 0.7.
The optical system 10 of the present invention further includes a reflective assembly 15. The reflective assembly 15 is located in the optical path between the lens assembly 13 and the preform source 30 and can be used to redirect the beam to focus the beam back onto the top end of the preform source 30.
In one embodiment, the reflective assembly 15 includes a first mirror 151 and a second mirror 152 disposed sequentially along the optical path. The first reflecting mirror 151 and the second reflecting mirror 152 are plane mirrors coated with a protective layer gold film, the coating range of the first reflecting mirror 151 and the second reflecting mirror 152 is 800 nm-20 mu m, the laser is insensitive to the incidence angle of laser emitted by the carbon dioxide laser 11, and the reflectivity is more than 96%. Wherein, the normal angle of the first reflecting mirror 151 and the second reflecting mirror 152 is 135 degrees.
In the embodiment shown in fig. 1, the lens assembly 13 comprises an anti-tele group. The distance between the beam shaper 12 and the principal plane of the inverse tele-optical component is identical to the working distance of the beam shaper 12, so that a stable 'airy spot' shape is ensured. The anti-tele group comprises a first group and a second group which are sequentially arranged along an optical path between the beam shaper 12 and the reflecting component 15, wherein the first group is a thin group with negative optical power, the first group comprises a biconcave lens 131, the second group is a thin group with positive optical power, and the second group comprises a biconvex lens 132. The separation between the first and second light groups in the anti-tele light group is 52.5mm.
The function of the anti-long distance optical group is to expand the working distance of the special optical fiber growing device. Adjusting the focal lengths of the first and second optical groups of the anti-tele optical groups may be used to change the focal plane position of the laser beam so that the working distance of the optical system 10 may be adjusted according to the length of the desired grown specialty fiber 40.
In one embodiment, the material of the biconcave lens 131 comprises ZnSe, the focal length of the biconcave lens 131 is-50 mm, the numerical aperture NA is 0.6, the coating range of the biconcave lens 131 is 7-12 μm, the antireflection is realized, and the laser emitted by the carbon dioxide laser 11 is high in transmission. The material of the biconvex lens 132 comprises ZnSe, the focal length is 100mm, the numerical aperture NA is 0.4, the coating range of the biconvex lens 132 is 7-12 mu m, the antireflection is realized, and the laser emitted by the carbon dioxide laser 11 is high in transmittance.
The following describes in detail the process of growing, for example, a single crystal optical fiber, using the optical system 10 shown in fig. 1 according to an embodiment of the present invention.
The laser emitted by the carbon dioxide laser 11 is collimated into parallel light by the aspheric lens 14, and then enters the beam shaper 12, the beam shaper 12 converts the Gaussian beam into a beam with 'Airy spot' intensity distribution, the beam enters the first reflecting mirror 151 after the focal plane position of the laser is adjusted by the biconcave lens 131 and the biconvex lens 132 of the anti-remote optical group, the direction of the laser beam is adjusted by the second reflecting mirror 152 after the laser beam is reflected by the first reflecting mirror 151, and the laser beam is focused to the top end of the prefabricated source rod 30 to form an annular heating area. The laser heating sufficiently melts the preform source rod 30 to obtain an initial melt for single crystal fiber growth, and then a laser heating susceptor method is used to grow single crystal fiber. The operation steps of the laser heating base method comprise: the diameter reduction ratio of the single crystal optical fiber to the prefabricated source rod 30 is kept to be 1:3; after the single crystal optical fiber grows to the required length, the feeding system 50 is closed, the pulling device 60 continues to pull the single crystal optical fiber off, the laser power is gradually reduced, the carbon dioxide laser 11 is closed, and then the single crystal optical fiber is taken out from the pulling device 60, so that the single crystal optical fiber is obtained. The specific operation steps of the growth process of the laser heating susceptor method are not particularly limited, and those familiar to those skilled in the art can be adopted.
Fig. 2 shows a schematic structure of an optical system 20 applied to a special optical fiber growing apparatus according to a second embodiment of the present invention.As shown in fig. 2, the optical system 20 of the second embodiment of the present invention also includes carbon dioxide (CO 2 ) A laser 11, a beam shaper 12, a lens assembly 13 and a reflecting assembly 15.
In this embodiment, the beam waist diameter of the laser beam emitted from the carbon dioxide laser 11 is 2.5mm, the beam quality M2<1.1, the center wavelength is 10.6 μm, the average power is 25W, the power stability is 0.5%, and the laser type is continuous laser.
Unlike the optical system 10 shown in fig. 1, the optical system 20 of the second embodiment of the present invention further includes a beam expanding system 24. The beam expanding system 24 is located in the optical path between the carbon dioxide laser 11 and the beam shaper 12 and may be used to expand and collimate the outgoing laser light into parallel light.
In one embodiment, the beam expanding system 24 includes a plano-concave lens 241 and a plano-convex lens 242 disposed sequentially along the optical path. The material of the plano-concave lens 241 comprises ZnSe, the focal length of the plano-concave lens 241 is-12.6 mm, the numerical aperture NA is 0.8, the coating range of the plano-concave lens 241 is 7-12 mu m, the anti-reflection effect is achieved, and the laser emitted by the carbon dioxide laser 11 is high-transparent. The material of the plano-convex lens 242 comprises ZnSe, the focal length of the plano-convex lens 242 is 132mm, the numerical aperture NA is 0.18, the coating range of the plano-convex lens 242 is 7-12 mu m, and the plano-convex lens 242 is anti-reflection and high in transmittance to laser emitted by the carbon dioxide laser 11. The spacing between plano-concave lens 241 and plano-convex lens 242 in beam expanding system 24 is 118mm.
The reflective element 15 is located in the optical path between the beam expanding system 24 and the beam shaper 12 and may be used to adjust the direction of the light beam. In this embodiment, the reflecting assembly 15 comprises a planar mirror 25. The plane mirror 25 is a plane mirror coated with a protective layer gold film, the coating range of the plane mirror 25 is 800 nm-20 mu m, the plane mirror is insensitive to the incidence angle of laser emitted by the carbon dioxide laser 11, the reflectivity is more than 96%, and the included angle between the transmission direction of light and the normal line of the plane mirror 25 is 45 degrees.
In this embodiment, the lens assembly 13 comprises a biconvex lens 23. The material of the lenticular lens 23 comprises ZnSe, the focal length of the lenticular lens 23 is 100mm, the numerical aperture NA is 0.4, the coating range of the lenticular lens 23 is 7-12 mu m, and the material is anti-reflection and high-transmission to laser emitted by the carbon dioxide laser 11.
The relationship between the front and rear spot diameters through the lenticular lens 23 is as follows:
d＝4λM 2 F/πD
wherein d is the diameter of the light spot focused by the biconvex lens 23, lambda is the wavelength of laser, M 2 F is the focal length of the lenticular lens 23, and D is the front spot diameter of the lenticular lens 23 after beam expansion by the beam expansion system 24.
Thus, by adjusting the beam expansion ratio of the beam expansion system 24, different focused spot sizes can be achieved according to the above formula.
The following will describe in detail the process of growing, for example, a single crystal optical fiber, using the optical system 20 shown in fig. 2 according to an embodiment of the present invention.
The laser beam emitted from the carbon dioxide laser 11 is collimated into parallel light by the plano-concave lens 241 and the plano-convex lens 242 of the beam expanding system 24, reflected to the beam shaper 12 by the plane mirror 25, converted into a gaussian beam with an intensity distribution of "airy disk" by the beam shaper 12, and focused to the top end of the preform source rod 30 by the biconvex lens 23 to form an annular heating region. The laser heating sufficiently melts the preform source rod 30 to obtain an initial melt for single crystal fiber growth, and then a laser heating susceptor method is used to grow single crystal fiber. The operation steps of the laser heating base method comprise: the single crystal optical fiber and the prefabricated source rod 30 are grown in a diameter reduction ratio of 1:3, after the single crystal optical fiber grows to the required length, the feeding system 50 is closed, the single crystal optical fiber is pulled off by continuing to pull the pulling device 60, the laser power is gradually reduced, the carbon dioxide laser 11 is closed, and then the single crystal optical fiber is taken out from the pulling device 60, so that the single crystal optical fiber is obtained. The specific operation steps of the growth process of the laser heating susceptor method are not particularly limited, and those familiar to those skilled in the art can be adopted.
The invention also provides a special optical fiber growth method. FIG. 4 discloses a flow chart of a special fiber growth method according to one embodiment of the present invention. As shown in fig. 4, the special optical fiber growth method according to an embodiment of the present invention may include steps S1 to S3.
In step S1, laser light is emitted using the carbon dioxide laser 11.
In step S2, the gaussian beam of the laser light is converted into a beam of an airy spot intensity distribution using the beam shaper 12.
In step S3, the focal plane position of the light beam is adjusted and the direction of the light beam is adjusted to focus the light beam onto the top end of the preform 30, so as to form an annular heating area for the growth of the special optical fiber.
In some embodiments, the specialty fiber growth methods of the present invention further comprise: the beam of the laser light is collimated into parallel light by the aspherical lens 14 and then enters the beam shaper 12.
Wherein adjusting the focal plane position of the light beam comprises: the focal plane position of the light beam is adjusted by an inverse tele group including a biconcave lens 131 and a biconvex lens 132.
Wherein adjusting the direction of the light beam comprises: the light beam with the focal plane position adjusted is reflected to the second reflecting mirror 152 by the first reflecting mirror 151 to adjust the direction of the light beam so that the light beam is reflected and focused to the top end of the prefabricated source rod 30 along the vertical direction.
In other embodiments, the specialty fiber growth methods of the present invention further comprise: the laser is expanded and collimated into parallel light using an expansion system 24.
Wherein adjusting the direction of the light beam comprises: the collimated parallel light is reflected by a plane mirror 25 to the beam shaper 12.
Wherein adjusting the focal plane position of the light beam comprises: the beam of the airy spot intensity distribution converted by the beam shaper 12 is focused to the top of the preform 30 by a lenticular lens 23.
The invention adopts laser to heat the optical fiber raw material, and can greatly reduce the introduction of impurities in the growth process of the special optical fiber 40. The diameter of the special optical fiber 40 can be regulated and controlled in real time by changing the ratio of the rod feeding speed of the prefabricated source rod 30 to the pulling speed of the special optical fiber 40 during the growth process of the special optical fiber 40.
The process manufacturing method is simple and efficient, and does not need a complex light path adjusting flow. Since the conventional LHPG technique converts the gaussian beam into the annular beam and focuses the annular beam on the top end of the preform 30, the central position of the annular beam and the optical axis do not coincide, thereby increasing the complexity of optical path adjustment. The special optical fiber growth method directly focuses the light beam with the 'Airy spot' intensity distribution without the complex light beam space shaping process.
The method of manufacturing the specialty fiber 40 of the present invention is more flexible. The working distance of the system can be flexibly adjusted according to the length of the special optical fiber 40 to be grown.
The invention is beneficial to improving the light energy utilization rate, adopts a plane reflector to replace a parabolic mirror used in the traditional LHPG technology, is beneficial to reducing aberration, ensures that energy is more concentrated in the central area of a thermal field, and reduces the outward dispersion of the energy of a central light spot.
The invention utilizes fewer optical devices to form annular light spots, can promote the heating uniformity of laser, simplify the degree of freedom of light path adjustment, reduce a series of problems caused by overhigh degree of freedom of the light path, and has important use significance.
The optical system, the special optical fiber growing device and the method provided by the embodiment of the invention are described in detail. Specific examples are set forth herein to illustrate the optical system, the special fiber growth device, and the method of embodiments of the present invention, and the description of the above embodiments is only for aiding in understanding the core concept of the present invention, and is not intended to limit the present invention. It should be noted that it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the spirit and principles of the invention, which should also fall within the scope of the appended claims.
Claims (29)
1. An optical system for use in a special fiber growth apparatus, comprising:
the carbon dioxide laser is used for emitting laser;
the beam shaper is positioned on an emergent beam path of the carbon dioxide laser and is used for converting Gaussian beams of the laser into beams with intensity distribution of Airy spots;
the lens component is positioned on the emergent beam path of the beam shaper and is used for adjusting the focal plane position of the beam so as to focus the beam to the top end of a prefabricated source rod of the special optical fiber growing device; and
and the reflecting assembly is positioned in the optical path between the carbon dioxide laser and the prefabricated source rod and is used for adjusting the direction of the light beam so as to reflect the light beam to the top end of the prefabricated source rod.
2. The optical system of claim 1, wherein: further comprises:
and the aspheric lens is positioned between the carbon dioxide laser and the beam shaper, and is used for collimating the light beam of the laser into parallel light and then making the parallel light enter the beam shaper, and adjusting the spot diameter size of the parallel light to be matched with the incident aperture of the beam shaper.
3. The optical system of claim 2, wherein: the material of the aspheric lens comprises ZnSe, the coating range of the aspheric lens is 7-12 mu m, and the aspheric lens is anti-reflection and high in transmittance to laser emitted by the carbon dioxide laser.
4. The optical system of claim 2, wherein: the reflection assembly is positioned in an optical path between the lens assembly and the preform source rod, and comprises a first reflector and a second reflector which are sequentially arranged along the optical path.
5. The optical system of claim 4, wherein: the first reflecting mirror and the second reflecting mirror are plane mirrors coated with a protective layer gold film, the coating ranges of the first reflecting mirror and the second reflecting mirror are 800 nm-20 mu m, the first reflecting mirror and the second reflecting mirror are insensitive to the incidence angle of laser emitted by the carbon dioxide laser, and the reflectivity is more than 96%.
6. The optical system of claim 2, wherein: the lens assembly includes an anti-tele optical group.
7. The optical system of claim 6, wherein: the distance between the beam shaper and the main plane of the anti-tele optical component is consistent with the working distance of the beam shaper.
8. The optical system of claim 6, wherein: the anti-tele optical group comprises a first optical group and a second optical group which are sequentially arranged along an optical path between the beam shaper and the reflecting component, wherein the first optical group comprises a biconcave lens, and the second optical group comprises a biconvex lens.
9. The optical system of claim 8, wherein: the biconcave lens and the biconvex lens are made of ZnSe, and the coating ranges of the biconcave lens and the biconvex lens are 7-12 mu m in antireflection, so that laser emitted by the carbon dioxide laser is high in transmittance.
10. The optical system of claim 8, wherein: focal lengths of the first optical group and the second optical group in the anti-tele optical group are adjusted to change focal plane positions of the light beams so as to adjust working distances of the optical system according to lengths of special optical fibers required to grow.
11. The optical system of claim 1, wherein: further comprises:
and the beam expanding system is positioned in an optical path between the carbon dioxide laser and the beam shaper and is used for expanding and collimating the laser beam into parallel light.
12. The optical system of claim 11, wherein: the beam expanding system comprises a plano-concave lens and a plano-convex lens which are sequentially arranged along the optical path.
13. The optical system of claim 12, wherein: the plano-concave lens and the plano-convex lens are made of ZnSe, and the plating ranges of the plano-concave lens and the plano-convex lens are 7-12 mu m in antireflection, so that laser emitted by the carbon dioxide laser is highly transparent.
14. The optical system of claim 11, wherein: the reflective assembly is positioned in the optical path between the beam expanding system and the beam shaper and includes a planar mirror.
15. The optical system of claim 14, wherein: the plane mirror is a plane mirror plated with a protective layer gold film, the plating film range of the plane mirror is 800 nm-20 mu m, the plane mirror is insensitive to the incidence angle of laser emitted by the carbon dioxide device, and the reflectivity is more than 96%.
16. The optical system of claim 11, wherein: the lens assembly includes a biconvex lens.
17. The optical system of claim 16, wherein: the material of the biconvex lens comprises ZnSe, the coating range of the biconvex lens is 7-12 mu m, and the biconvex lens is high in transmittance to laser emitted by the carbon dioxide laser.
18. The optical system of any one of claims 1 to 17, wherein: the center wavelength of the carbon dioxide laser is 10.57-10.63 mu m.
19. The optical system of claim 18, wherein: the carbon dioxide laser has a center wavelength of 10.6 μm.
20. The optical system of any one of claims 1 to 17, wherein: the type of laser emitted by the carbon dioxide laser comprises continuous laser or quasi-continuous laser.
21. A special optical fiber growing device, which is characterized in that: comprising the following steps:
the optical system of any one of claims 1 to 20;
prefabricating a source rod;
the seed optical fiber is placed in a melting area at the top end of the prefabricated source rod;
a feed system for delivering the preform source upward during the growth of the specialty fiber; and
the lifting device is used for lifting the grown special optical fiber upwards in the growth process of the special optical fiber.
22. The specialty fiber growth apparatus of claim 21, wherein: the special optical fiber comprises a single crystal optical fiber, a photonic crystal optical fiber, a glass optical fiber, a plastic optical fiber or a multifunctional optical fiber.
23. A special optical fiber growth method is characterized in that: comprising the following steps:
emitting laser by using a carbon dioxide laser;
converting the Gaussian beam of the laser into a beam with an Airy spot intensity distribution using a beam shaper; and
and adjusting the focal plane position of the light beam and the direction of the light beam to reflect and focus the light beam to the top end of the prefabricated source rod, so as to form an annular heating area to realize the growth of the special optical fiber.
24. The method for growing a specialty fiber of claim 23, wherein: further comprises:
and using an aspheric lens to collimate the laser beam into parallel light and then making the parallel light enter the beam shaper.
25. The method for growing a specialty fiber of claim 24, wherein: adjusting the focal plane position of the light beam includes:
the focal plane position of the beam is adjusted by an anti-tele group comprising a biconcave lens and a biconvex lens.
26. The method for growing a specialty fiber of claim 25, wherein: adjusting the direction of the light beam includes:
and reflecting the light beam with the focal plane position adjusted to a second reflecting mirror through a first reflecting mirror to adjust the direction of the light beam so as to enable the light beam to be reflected and focused to the top end of the prefabricated source rod along the vertical direction.
27. The method for growing a specialty fiber of claim 23, wherein: further comprises:
the laser is expanded and collimated into parallel light using an expansion system.
28. The method for growing a specialty fiber of claim 27, wherein: adjusting the direction of the light beam includes:
and reflecting the collimated parallel light to the beam shaper through a plane reflector.
29. The method for growing a specialty fiber of claim 28, wherein: adjusting the focal plane position of the light beam includes:
and focusing the beam with the Airy spot intensity distribution converted by the beam shaper to the top end of the prefabricated source rod through a biconvex lens.
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| CN116969670A (en) * | 2023-09-21 | 2023-10-31 | 之江实验室 | Optical system, special optical fiber growing device and method thereof |
| CN116969670B (en) * | 2023-09-21 | 2024-01-09 | 之江实验室 | Optical system, special optical fiber growing device and method thereof |
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