CN112558229B - Technological manufacturing method of high-precision optical fiber focuser - Google Patents
Technological manufacturing method of high-precision optical fiber focuser Download PDFInfo
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- CN112558229B CN112558229B CN202011468549.5A CN202011468549A CN112558229B CN 112558229 B CN112558229 B CN 112558229B CN 202011468549 A CN202011468549 A CN 202011468549A CN 112558229 B CN112558229 B CN 112558229B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
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Abstract
The invention discloses a process manufacturing method of a high-precision optical fiber focalizer, which comprises the following steps of bonding and combining an optical lens and a packaging steel pipe; secondly, placing and fixing the light beam scanner at a distance d from the optical lens; then taking a finished product focuser which is finished to be manufactured, placing the finished product focuser on a V-shaped groove tool, adhering the finished product focuser to the V-shaped groove, rotating the finished product focuser by 360 degrees, and recording X and Y coordinate values of 3 symmetrical points on a light beam scanner as (X1, Y1) in the rotating process; (X2, Y2); (X3, Y3) according to geometric calculations. Has the advantages that: the device and the related algorithm can realize real-time adjustment of point precision and improve the control precision of point precision parameters.
Description
Technical Field
The invention relates to the technical field of manufacturing of optical fiber focalizers, in particular to a technological manufacturing method of a high-precision optical fiber focalizer.
Background
The optical fiber is used for transmitting laser, and is widely applied to various fields such as optical fiber communication networks, laser medical treatment, laser processing and manufacturing and the like. In some specific applications, high-precision positioning of the laser is required, and accordingly, a high-precision fiber focuser is required.
In the field of industrial application, the requirement for high-precision laser processing is higher and higher, the focalizer is required to have high-precision laser positioning and high-precision laser spot size, and accordingly, how to obtain the main direction of current research on the high-performance optical fiber focalizer is needed. The general structure of the optical fiber focuser is shown in figure 1, and comprises an optical fiber terminal, a packaging steel tube and an optical lens.
The main optical parameters of the fiber focuser include:
focus spot size (SD: spot size): the size of the focusing light spot of the focuser;
working Distance (WD): the distance of the focusing light spot from the optical lens;
point precision (PA: pointing angle): and the axial included angle between the outgoing light beam of the focuser and the packaging steel pipe of the focuser is formed.
When the focalizer is produced, the distance I between the optical fiber terminal and the optical lens needs to be accurately adjusted, so that light beams emitted from the optical lens can be focused to an appointed light spot size at an appointed working distance, and meanwhile, after the direction of light beam emission is ensured to be coaxial with the packaging steel pipe, all components are fixed by glue.
The current common production process of the focalizer is to use a high-precision light beam scanner to measure and read the sizes of light beams emitted by the focalizer at a plurality of different positions, find out the minimum light spot size and the minimum focusing size, measure the distance between the position and the optical lens as the working distance, and then debug the distance between the optical fiber terminal and the optical lens until the measured focusing light spot size and the measured working distance meet the design values. Meanwhile, during production, each component is unfixed and cannot test point precision parameters in real time, so that the common focalizer manufacturing mode is to strictly control the dimensional tolerance of each component used by the focalizer and improve the matching degree of the components, so that the light path trend is coaxial with the physical axis of the device packaging steel pipe to design and ensure the point precision parameters of the focalizer;
through the above mode focalizer, the spot size values of a plurality of positions need to be read in each test, the production efficiency is low, in addition, the spot at the spot position is approximate collimated parallel light, the focusing position cannot be accurately positioned within a certain distance (optically called as Rayleigh distance) and the working distance of the focusing position can not be determined, and the focusing spot of the high-performance focalizer is very small, if the focusing spot needs to be accurately measured, a beam scanner with higher performance is required. The production cost is increased. In addition, the point precision can only reach 10mrad generally only by the design of the structural size tolerance, and the production with high efficiency and qualified rate cannot be ensured only by controlling the size under higher requirements.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention aims to provide a process manufacturing method of a high-precision optical fiber focalizer, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a process manufacturing method of a high-precision optical fiber focalizer comprises the following steps:
step one, bonding and combining an optical lens and a packaging steel pipe;
step two, placing and fixing the light beam scanner at a distance d from the optical lens; then taking a finished product focalizer which is finished to be manufactured, placing the finished product focalizer on a V-shaped groove tool, enabling the finished product focalizer to be attached to the V-shaped groove and rotate 360 degrees, and recording X and Y coordinate values of 3 symmetrical points on a light beam scanner as (X1, Y1) in the rotating process; (X2, Y2); (X3, Y3), according to geometric calculation, calculating the corresponding center coordinates (X0, Y0) according to the following formula;
U＝(X1^2-X2^2+Y1^2-Y2^2)/(2*X1-2*X2)；
V＝(X1^2-X3^2+Y1^2-Y3^2)/(2*X1-2*X3)；
K1＝(Y1-Y2)/(X1-X2)；
K2＝(Y1-Y3)/(X1-X3)；
X0＝V-(U-V)*K2/(K1-K2)；
Y0＝(U-V)/(K1-K2)；
step three, determining the relative position
Fixing the assembly finished in the first step on a V-shaped groove clamp, and ensuring that the distance between an optical lens of the assembly and a light beam scanner is d;
step four, adjusting the size of the light spot
Adjusting the distance between the optical fiber terminal and the optical lens to make the light spot value read on the light beam scanner reach the minimum, namely the distance between the optical fiber terminal and the optical lens is larger than the back focal length of the optical lens;
continuing to finely adjust the distance between the optical fiber terminal and the optical lens in the large direction to enable the light spot on the light beam scanner to reach a theoretical value calculated in advance;
step five, adjusting point precision
Observing the coordinate value of the center of the light beam on the light beam scanner, and calculating the point precision value PA of the focalizer at the moment through the following formula, wherein the point precision can be tested in real time at the moment;
PA＝r/d＝((x-x0)^2+(y-y0)^2)^0.5/d
adjusting the included angle between the optical fiber terminal and the packaging steel pipe to enable the central coordinate value of the light beam to be as close as possible to the target coordinate value, calculating the point precision value according to the formula, and debugging the parameter to be optimal;
step six, using glue to solidify the focalizer
And repeating the fourth step and the fifth step, fixing the optical fiber terminal and the packaging steel pipe by using glue after the size of the light spot and the point precision are determined to be qualified, finishing the manufacture of the current focalizer, and starting to manufacture the next focalizer from the second step in batch production.
Compared with the prior art, the invention has the following beneficial effects: the device has the advantages that the light spot far away from the optical lens by a distance is monitored and adjusted, the direct adjustment of the size and the working distance of the focusing light spot of the focuser is replaced, the distance between the optical fiber terminal and the optical lens is adjusted more accurately, the working distance and the focusing light spot of the optical fiber focuser are enabled to be higher in precision and better in consistency, the production efficiency is effectively improved, meanwhile, the real-time adjustment of the point precision can be realized through the device and the related algorithm, and the control precision of the point precision parameters is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a fiber focuser;
FIG. 2 is a schematic diagram of the definition of key parameters of a fiber focuser;
FIG. 3 is an optical path diagram of a high precision fiber optic focuser according to an embodiment of the present invention;
FIG. 4 is a table of I, BS, SB, and WD correspondences plotted using Zemax optical product design and simulation software;
FIG. 5 is a graph comparing I vs BS, I vs SD, and I vs WD after adjustment of the I parameter;
FIG. 6 is a schematic diagram of the structure of a high precision optical fiber focalizer and an optical speed scanner during the manufacturing process of the focalizer according to the embodiment of the present invention;
FIG. 7 is a schematic diagram showing the structure of the circle center coordinates (X0, Y0) in the process of manufacturing a high-precision optical fiber focalizer according to the embodiment of the present invention;
FIG. 8 is a flow chart of a method for manufacturing a high precision fiber focuser according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and detailed description:
the first embodiment is as follows:
referring to fig. 1-8, a method for manufacturing a high-precision optical fiber focuser according to an embodiment of the present invention includes the following steps:
s101, bonding and combining the optical lens and the packaging steel pipe;
s103, placing the light beam scanner at a distance d from the optical lens and fixing; then taking a finished product focalizer which is finished to be manufactured, placing the finished product focalizer on a V-shaped groove tool, enabling the finished product focalizer to be attached to the V-shaped groove and rotate 360 degrees, and recording X and Y coordinate values of 3 symmetrical points on a light beam scanner as (X1, Y1) in the rotating process; (X2, Y2); (X3, Y3), according to geometric calculation, calculating the corresponding center coordinates (X0, Y0) according to the following formula;
U＝(X1^2-X2^2+Y1^2-Y2^2)/(2*X1-2*X2)；
V＝(X1^2-X3^2+Y1^2-Y3^2)/(2*X1-2*X3)；
K1＝(Y1-Y2)/(X1-X2)；
K2＝(Y1-Y3)/(X1-X3)；
X0＝V-(U-V)*K2/(K1-K2)；
Y0＝(U-V)/(K1-K2)；
s105, determining relative position
Fixing the assembly finished in the first step on a V-shaped groove clamp, and ensuring that the distance between an optical lens of the assembly and a light beam scanner is d;
s107, adjusting the size of the light spot
Adjusting the distance between the optical fiber terminal and the optical lens to make the light spot value read on the light beam scanner reach the minimum, namely the distance between the optical fiber terminal and the optical lens is larger than the back focal length of the optical lens;
continuing to finely adjust the distance between the optical fiber terminal and the optical lens in a large direction to enable the light spot on the light beam scanner to reach a theoretical value calculated in advance;
s109, point precision adjustment
Observing a light beam center coordinate value on a light beam scanner, and calculating a point precision value PA of the focuser at the moment by the following formula, wherein the point precision can be tested in real time at the moment;
PA＝r/d＝((x-x0)^2+(y-y0)^2)^0.5/d
adjusting the included angle between the optical fiber terminal and the packaging steel pipe to enable the central coordinate value of the light beam to be as close to the target coordinate value as possible, calculating the point precision value according to the formula, and debugging the parameter to be optimal;
s111, solidifying focalizer by using glue
And repeating the fourth step and the fifth step, fixing the optical fiber terminal and the packaging steel pipe by using glue after the size of the light spot and the point precision are determined to be qualified, finishing the manufacture of the current focalizer, and starting to manufacture the next focalizer from the second step in batch production.
According to the technical scheme, the light spot at a distance away from the optical lens is monitored and adjusted to replace direct adjustment of the size and the working distance of the focusing light spot of the focalizer, so that the distance between the optical fiber terminal and the optical lens is adjusted more accurately, the working distance and the focusing light spot of the optical fiber focalizer are higher in precision and better in consistency, the production efficiency of the optical fiber focalizer is effectively improved, meanwhile, real-time adjustment of point precision can be achieved through the device and the related algorithm, and the control precision of point precision parameters is improved.
For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.
In practical application, the device comprises an optical platform, a 3-dimensional (X/Y/Z) adjusting frame, a V-shaped groove and a pressing block which are fixed on the three-dimensional adjusting frame, a high-precision slit type beam scanner and a fixing device thereof.
a) When the end face of the optical fiber terminal is far away from the focal point of the optical lens during the production of the focuser, the emitted light beam starts to focus, and the larger the distance I between the emitted light beam and the optical lens is, the smaller the focusing light spot is, and the smaller the working distance is.
b) The invention provides that the adjustment of the size of a focused light spot and the working distance is completed by adjusting the size of the light spot at a distance (d is greater than the working distance of a focalizer according to the design requirement of the process) from an optical lens, namely, when the focusing device is produced, the adjustment of the size of the focused light spot and the working distance is completed by adjusting a target value of a debugging value of the size of the light spot (BS) at the distance from the lens d through adjusting I. Meanwhile, the light spots at the position d are in a divergent state, and compared with the light spots at the focusing position which are approximately collimated parallel light, the size of the light spots at the position d is more sensitive relative to the value I, so that the value I at the final debugging position of the process is more accurate and has better consistency.
The design requires that the light spot at the position d is debugged to be the minimum in advance, the light beam is focused at the position d at the moment, the adjustment is continued, the value I is increased, the light spot at the position d begins to be enlarged, the working distance is reduced, and the light spot value at the position d and the working distance form a one-to-one correspondence relationship. The working distance and the light spot size of the optical fiber focalizer required to be manufactured are calculated in advance, the light spot size at the working position d is calculated and debugged to a design value, and then the adjustment of the working distance and the focusing light spot size of the focalizer is completed.
Assuming that λ =1550nm, a =10.4um, f =1.905mm, and d is set to 15mm, using Zemax optical product design and simulation software, the correspondence as shown in fig. 4 can be obtained.
When the focalizer is produced, the parameter I needs to be adjusted, and compared with the curves of I vs BS, I vs SD and I vs WD, as shown in fig. 5, it can be found that the slope of the curve of I vs BS is larger, and the control accuracy is higher by selecting BS as the monitoring parameter to adjust I.
c) And for the control of the point precision parameters, the process method can calculate the point precision parameters in the debugging process by calculating the distance between the coordinate position of the light beam on the light beam scanner and the target coordinate position, namely the point precision parameters can be monitored in real time and correspondingly adjusted in the process of adjusting the size of the light spot.
The specific method comprises the following steps:
1) Firstly, determining target coordinates, namely, placing a finished product focuser (which can be made in a conventional mode) on a V-shaped groove tool, attaching the finished product focuser to the V-shaped groove, rotating the finished product focuser for 360 degrees, and recording X and Y coordinate values of 3 symmetrical points on a light beam scanner as (X1, Y1) in the rotating process; (X2, Y2); (X3, Y3), according to geometric calculation, the corresponding coordinates (X0, Y0) of the center of the circle can be calculated according to the following formula, that is, the target coordinates are as shown in fig. 3:
U＝(X1^2-X2^2+Y1^2-Y2^2)/(2*X1-2*X2)；
V＝(X1^2-X3^2+Y1^2-Y3^2)/(2*X1-2*X3)；
K1＝(Y1-Y2)/(X1-X2)；
K2＝(Y1-Y3)/(X1-X3)；
X0＝V-(U-V)*K2/(K1-K2)；
Y0＝(U-V)/(K1-K2)；
2) After the target coordinate is determined, the light spot adjustment in the step b) can be performed, in the adjustment process, the point precision value can be calculated in real time by reading the central coordinate position of the light beam on the light beam scanner, the point precision parameter is optimized and adjusted relative to the packaging steel pipe by adjusting the optical fiber terminal according to the following formula, and the real-time adjustment of the point precision parameter is realized:
point precision value: PA = r/d = ((x-x 0) ^2+ (y-y 0) ^ 2) ^0.5/d
Therefore, the device can be used for monitoring and adjusting the light spot far away from the optical lens by a distance, and replacing the direct adjustment of the size and the working distance of the focusing light spot of the focuser, so that the distance between the optical fiber terminal and the optical lens can be adjusted more accurately, the working distance and the focusing light spot of the optical fiber focuser have higher precision and better consistency, the production efficiency is effectively improved, meanwhile, the device and the related algorithm can be used for realizing the real-time adjustment of the point precision, and the control precision of the point precision parameters is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A technological manufacturing method of a high-precision optical fiber focuser is characterized in that the optical fiber focuser comprises an optical fiber terminal, a packaging steel pipe and an optical lens, and the technological manufacturing method comprises the following steps:
step one, bonding and combining an optical lens and a packaging steel pipe;
secondly, placing and fixing the light beam scanner at a distance d from the optical lens; then taking a finished product focalizer which is finished to be manufactured, placing the finished product focalizer on a V-shaped groove tool, enabling the finished product focalizer to be attached to the V-shaped groove and rotate 360 degrees, and recording X and Y coordinate values of 3 symmetrical points on a light beam scanner as (X1, Y1) in the rotating process; (X2, Y2); (X3, Y3), according to geometric calculation, calculating the corresponding center coordinates (X0, Y0) according to the following formula;
U＝(X1^2-X2^2+Y1^2-Y2^2)/(2*X1-2*X2)；
V＝(X1^2-X3^2+Y1^2-Y3^2)/(2*X1-2*X3)；
K1＝(Y1-Y2)/(X1-X2)；
K2＝(Y1-Y3)/(X1-X3)；
X0＝V-(U-V)*K2/(K1-K2)；
Y0＝(U-V)/(K1-K2)；
step three, determining the relative position
Fixing the assembly finished in the first step on a V-shaped groove clamp, and ensuring that the distance between an optical lens of the assembly and a light beam scanner is d;
step four, adjusting the size of the light spot
Adjusting the distance between the optical fiber terminal and the optical lens to make the light spot value read on the light beam scanner reach the minimum, namely the distance between the optical fiber terminal and the optical lens is larger than the back focal length of the optical lens;
continuing to finely adjust the distance between the optical fiber terminal and the optical lens in a large direction to enable the light spot on the light beam scanner to reach a theoretical value calculated in advance;
step five, point precision adjustment
Observing a light beam center coordinate value on a light beam scanner, and calculating a point precision value PA of the focuser at the moment by the following formula, wherein the point precision can be tested in real time at the moment;
PA＝r/d＝((x-x0)^2+(y-y0)^2)^0.5/d
adjusting the included angle between the optical fiber terminal and the packaging steel pipe to enable the central coordinate value of the light beam to be as close to the target coordinate value as possible, calculating the point precision value according to the formula, and debugging the parameter to be optimal;
step six, using glue to solidify the focalizer
And repeating the fourth step to the fifth step, fixing the optical fiber terminal and the packaging steel pipe by using glue after the size of the light spot and the precision adjustment of the point are qualified, finishing the manufacture of the current focalizer, and starting to manufacture the next focalizer from the second step in batch production.
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