CN112596253B - Light beam superposition adjusting device and adjusting method - Google Patents
Light beam superposition adjusting device and adjusting method Download PDFInfo
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- CN112596253B CN112596253B CN202011614080.1A CN202011614080A CN112596253B CN 112596253 B CN112596253 B CN 112596253B CN 202011614080 A CN202011614080 A CN 202011614080A CN 112596253 B CN112596253 B CN 112596253B
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0988—Diaphragms, spatial filters, masks for removing or filtering a part of the beam
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
Abstract
The utility model discloses a light beam superposition adjusting device and an adjusting method, wherein the light beam superposition adjusting device comprises a first adjusting table provided with a first diaphragm and a first visible light laser and a second adjusting table provided with a second diaphragm and a second visible light laser or a light detector, a light screen for observing the superposition state of two light beams is arranged between the first adjusting table and the second adjusting table, and the first adjusting table and the second adjusting table are provided with a horizontal X-direction translation freedom degree, a horizontal Y-direction translation freedom degree, a vertical translation freedom degree, a pitching direction rotation freedom degree and a horizontal rotation freedom degree; the wavelength of the emergent laser beam of the second visible light laser is different from that of the emergent laser beam of the first visible light laser; the method is simple and convenient to realize the coupling of the light beam (also suitable for optical fiber coupling) and alignment experiment or optical processing adjustment, reduces the cost, has good universality and improves the light beam adjustment efficiency and the light beam adjustment effect; the method is suitable for coupling and aligning experiments or optical processing adjustment of light beams.
Description
Technical Field
The utility model relates to the technical field of optical axis same-path adjustment of two beams of light in optical technology, in particular to a light beam superposition adjustment device and an adjustment method, which are used for superposition or alignment of coupling between light beams and an optical axis.
Background
For uniform media, in the category of geometric optics, a straight line propagating beam is turned and divided into two beams to meet again, for example, a dispersion pulse laser using a differential and time-delay light path, or a light beam propagated by an optical fiber enters an optical fiber after entering a bulk optical device, for example, an optical fiber attenuator, an optical fiber Fabry-Perot interferometer or an etalon, and the like, the two beams are required to be completely coaxial and coincident to achieve minimum attenuation, which is particularly important for the application fields of optical fiber coupling, infrared and ultraviolet light beams of weak light signals or non-visible light, such as Raman scattering, and the like.
The utility model discloses a light beam alignment device and an alignment method of a symmetrically arranged laser displacement sensor, which are disclosed in China patent publication No. CN109668512A, and the patent name is 'light beam alignment device and alignment method of the symmetrically arranged laser displacement sensor', but the light beam alignment device and the alignment method are based on a light beam coupling technology that deflection angles of two light beams are amplified and then imaged on two faces of the same light screen respectively by visible light, are not applicable to infrared light or ultraviolet light, and particularly are difficult to obtain a detectable light spot image by amplifying a weak light signal through a small hole and a two-stage lens.
The utility model discloses a collimation device of a Z-axis galvanometer assembly, a Z-axis galvanometer assembly and a collimation system, which mainly aims at the problem of collimation of the Z-axis of a galvanometer of a laser marking system, has no universality, high technical cost and excessively complex adjustment, requires large adjustment space and is not applicable to the requirements of random adjustment space such as optical fiber coupling, invisible optical coupling and the like.
At present, the problems of serious optical signal attenuation, complex optical path adjustment and high technical cost exist in the light beam coupling process. Therefore, there is a need for a simple and convenient device and technique for adjusting beam coupling and alignment experiments or optical processing, which improves the adjustment efficiency and reduces the technical cost.
Disclosure of Invention
The utility model provides a light beam superposition adjusting device and an adjusting method, which can solve the problems of serious light signal attenuation, complex light path adjustment and high technical cost during light beam coupling, and realize simple and convenient light beam coupling and alignment experiment or optical processing adjustment.
The utility model provides a light beam superposition adjusting device, which comprises a first adjusting table (1) and a second adjusting table (2), wherein a first visible light laser (4) and a first diaphragm (5) with an adjustable aperture are sequentially and fixedly arranged on the first adjusting table (1), and a second diaphragm (7) and a second visible light laser (6) or a light receiving detector (601) are sequentially arranged on the second adjusting table (2); a light-transmitting plate (3) is arranged between the first diaphragm (5) and the second diaphragm (7); the wavelength of the outgoing laser beam of the second visible light laser (6) is different from the wavelength of the outgoing laser beam of the first visible light laser (4); the first adjusting table (1) and the second adjusting table (2) have one or more than two adjusting degrees of freedom of horizontal X-direction translational degrees of freedom, horizontal Y-direction translational degrees of freedom, vertical direction translational degrees of freedom, pitching direction rotational degrees of freedom and horizontal direction rotation degrees of freedom.
In the above scheme, it is preferable that the light-transmitting plate (3) is provided with a graduated scale.
It may also be preferred that the first adjustment stage (1) and the second adjustment stage (2) are mounted on an optical bench (8).
Another aspect of the present utility model provides a beam superposition adjusting method, which adopts the beam superposition adjusting device, comprising the following steps,
a second diaphragm (7) and a second visible light laser (6) are arranged on a second adjusting table (2);
the aperture sizes of the first diaphragm (5) and the second diaphragm (7) are adjusted to be equal, and then the smaller spot cross-section diameter in the spot cross-section diameters of the emergent laser beams in the first visible light laser (4) and the second visible light laser (6) is taken and compared with the aperture sizes of the first diaphragm (5) and the second diaphragm (7), so that the aperture diameter is smaller than the smaller spot cross-section diameter; the spot centers of the first visible light laser (4) and the second visible light laser (6) are respectively overlapped with the aperture center points of the first diaphragm (5) and the second diaphragm (7);
the emergent laser beam of the first visible light laser (4) passes through the first diaphragm (5) and the second diaphragm (7); adjusting the outgoing laser beam of the second visible light laser (6) to reversely pass through the first diaphragm (5) against the outgoing laser beam of the first visible light laser (4); so that the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are overlapped;
intercepting the emergent laser beams of the first visible light laser (4) along the propagation direction thereof through the light-transmitting plate (3);
if the spot size of the emergent laser beams on the light-transmitting plate (3) is larger than the aperture sizes of the first diaphragm (5) and the second diaphragm (7), the two emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are respectively shown; the light spots of the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are observed on the light-transmitting plate (3), and the movement amount or the rotation angle of one or more than two dimensions of the first adjusting table (1) and the second adjusting table (2) is adjusted according to the deviation direction and the deviation degree of the light spots of the emergent laser beams of the second visible light laser (6).
In the above aspect, it is preferable that the aperture sizes of the first diaphragm (5) and the second diaphragm (7) are repeatedly reduced; then, the light spots of the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are observed on the light-transmitting plate (3), and the movement amount or the rotation angle of one or more than two dimensions of the first adjusting table (1) and the second adjusting table (2) is adjusted according to the deviation direction and the deviation degree of the light spots of the emergent laser beams of the second visible light laser (6).
It may also be preferable to use a laser having an outgoing laser beam wavelength of 632.8nm as the first visible light laser (4).
It may also be preferable to use a laser having an outgoing laser beam wavelength of 532nm as the second visible light laser (6).
It may also be preferable to remove the light-transmitting plate (3); replacing the second visible light laser (6) with a light detector (601), mounting the light detector (601) on the second adjusting table (2), and reducing the aperture sizes of the first diaphragm (5) and the second diaphragm (7); then, the received signal value of the optical detector (601) is observed, and the movement amount or the rotation angle of one or more dimensions of the first adjusting table (1) and the second adjusting table (2) is adjusted through the degree of freedom of the one or more dimensions of the first adjusting table (1) and the second adjusting table (2) until the received signal of the optical detector (601) reaches the maximum value.
It may also be preferable to replace the second visible light laser (6) with an invisible light source and install the invisible light source on the second adjustment table (2) after the beam superposition adjustment, so as to realize the superposition of the emergent laser beams of the invisible light source and the first visible light laser (4).
The light beam superposition adjusting device and the adjusting method can solve the problems of serious light signal attenuation, complex light path adjustment and high technical cost during light beam coupling, can realize simple and convenient light beam coupling and alignment experiment or optical processing adjustment, have reasonable light path, reduce cost and good universality, and improve light beam adjusting efficiency and light beam adjusting effect; the optical fiber coupling device is suitable for any common adjustment space, such as optical fiber coupling, invisible optical coupling and other requirements, and is suitable for the aspects of simple and rapid optical beam coupling and alignment experiments or optical processing adjustment technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
fig. 1 is a light path diagram of a first visible light laser and a second visible light laser of the beam superposition adjusting device in a non-completely superposition state.
Fig. 2 is a light path diagram of the beam overlap condition of the first and second visible light lasers of the beam overlap adjustment device according to the present utility model.
Fig. 3 is a schematic structural diagram of a second adjusting table of the beam superposition adjusting device according to the present utility model, on which a second visible light laser is mounted to perform primary adjustment of superposition of outgoing laser beams.
Fig. 4 is a schematic structural diagram of the second adjusting stage of the beam superposition adjusting device according to the present utility model, in which a photodetector is mounted on the second adjusting stage to perform fine superposition adjustment of outgoing laser beams.
In the figure, 1 is a first adjusting table, 2 is a second adjusting table, 3 is a light-transmitting plate, 4 is a first visible light laser, 5 is a first diaphragm, 6 is a second visible light laser, 601 is a light detector, 7 is a second diaphragm, 8 is an optical bench, and 9 is a light-transmitting plate bracket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to specific embodiments of the present utility model and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The following describes in detail the technical solutions provided by the embodiments of the present utility model with reference to the accompanying drawings.
Example 1
A light beam superposition adjusting device, please refer to fig. 1 to 4, comprising a first adjusting table 1 and a second adjusting table 2, wherein a first visible light laser 4 and a first diaphragm 5 with an adjustable aperture are sequentially and fixedly installed on the first adjusting table 1, and a second diaphragm 7 and a second visible light laser 6 or a light receiving detector 601 are sequentially installed on the second adjusting table 2; a light-transmitting plate 3 is arranged between the first diaphragm 5 and the second diaphragm 7; the wavelength of the outgoing laser beam of the second visible light laser 6 is different from the wavelength of the outgoing laser beam of the first visible light laser 4; the first adjustment stage 1 and the second adjustment stage 2 have one or at least two or more adjustment degrees of freedom of horizontal X-direction translational degrees of freedom, horizontal Y-direction translational degrees of freedom, vertical direction translational degrees of freedom, pitch direction rotational degrees of freedom, and horizontal direction rotational degrees of freedom.
Example 2
A beam coincidence adjusting device is similar to embodiment 1 except that a graduation scale is provided on the light-transmitting plate 3.
It is also possible in particular that the first adjustment stage 1 and the second adjustment stage 2 are mounted on an optical bench 8.
More specifically, a first adjusting table 1 is installed on the left side of the top surface of the optical bench 8, a second adjusting table 2 with the bottom surface for installing a second visible light laser 6 or a light detector 601 is installed on the right side of the top surface of the optical bench 8, a first visible light laser 4 and a first diaphragm 5 with an adjustable aperture are fixedly installed on the first adjusting table 1, the first visible light laser 4 is located on the left side of the first diaphragm 5, the center of an outgoing laser beam of the first visible light laser 4 and the center of a diaphragm hole of the first diaphragm 5 are at the same height, and the beam center of the outgoing laser beam of the first visible light laser 4 is perpendicular to the first diaphragm 5; the top surface of the second adjusting table 2 is fixedly provided with a second diaphragm 7 with an adjustable aperture, the second diaphragm 7 is positioned on the left side where the second visible light laser 6 or the optical detector 601 is positioned, the center of a diaphragm aperture of the second diaphragm 7 is positioned at the same height with the center of a laser beam emitted by the second visible light laser 6 or the center of a receiving surface of the optical detector 601, and the second diaphragm 7 is perpendicular to the center of a beam of an emitted laser beam of the second visible light laser 6 or the optical axis of the optical detector 601; a light-transmitting plate 3 is arranged between the first adjusting table 1 and the second adjusting table 2, and the directions of the emitting laser beams of the first visible light laser 4 and the second visible light laser 6 or the receiving surfaces of the light detectors 601 are opposite and all penetrate through the light-transmitting plate 3; the light-transmitting plate 3 is perpendicular to the beam centers of the outgoing laser beams of the first visible light laser 4 and the second visible light laser 6 or the optical axes of the light detectors 601; the light-transmitting plate 3 is provided with a graduated scale; the first adjusting table 1 and the second adjusting table 2 are five-dimensional adjusting tables, and the five-dimensional adjusting tables have horizontal X-direction translation freedom degrees, horizontal Y-direction translation freedom degrees, vertical translation freedom degrees, pitching rotation freedom degrees and horizontal rotation freedom degrees; the wavelength of the outgoing laser beam of the second visible light laser 6 is different from the wavelength of the outgoing laser beam of the first visible light laser 4.
Still further, the light-transmitting plate 3 is mounted on a light-transmitting plate holder 9, and the light-transmitting plate holder 9 is mounted on the optical bench 8.
It may also be specific that the top surface of the optical bench 8 is provided with a slide on which the light-transmitting plate holder 9 is movably mounted.
It may also be specific that the light-transmitting plate holder 9 is provided with a locking knob by means of which the light-transmitting plate holder 9 is locked on the optical bench 8.
Example 3
A beam overlap adjustment method using the beam overlap adjustment apparatus according to embodiment 1 or embodiment 2 includes the steps of,
a second diaphragm 7 and a second visible light laser 6 are arranged on the second adjusting table 2;
the aperture sizes of the first diaphragm 5 and the second diaphragm 7 are adjusted to be equal, and then the smaller spot cross-section diameter in the spot cross-section diameters of the emergent laser beams in the first visible light laser 4 and the second visible light laser 6 is taken and compared with the aperture sizes of the first diaphragm 5 and the second diaphragm 7, so that the aperture diameter is smaller than the smaller spot cross-section diameter; and the spot centers of the first visible light laser 4 and the second visible light laser 6 are respectively overlapped with the aperture center points of the first diaphragm 5 and the second diaphragm 7;
so that the outgoing laser beam of the first visible light laser 4 passes through the first diaphragm 5 and the second diaphragm 7; adjusting the outgoing laser beam of the second visible light laser 6 to reversely pass through the first diaphragm 5 against the outgoing laser beam of the first visible light laser 4; so that the outgoing laser beams of the first visible light laser 4 and the second visible light laser 6 coincide;
intercepting the emergent laser beam of the first visible light laser 4 along the propagation direction thereof through the light-transmitting plate 3;
if the spot size of the outgoing laser beam on the light-transmitting plate 3 is larger than the aperture sizes of the first diaphragm 5 and the second diaphragm 7, and the spots of the two outgoing laser beams of the first visible light laser 4 and the second visible light laser 6 are respectively presented; the light spots of the outgoing laser beams of the first and second visible light lasers 4, 6 are observed on the light-transmitting plate 3, and the movement amount or the rotation angle of one or both of the first and second adjustment stages 1, 2 in the dimension is adjusted by the degree of freedom of the one or more of the first and second adjustment stages 1, 2 according to the deviation direction and the deviation degree of the light spots of the outgoing laser beams of the second visible light lasers 6.
In the light beam superposition adjusting method of the embodiment, when the transparent plate 3 is provided with the graduated scale, the transparent plate 3 with the graduated scale intercepts the emergent laser beam of the first visible light laser 4 along the propagation direction of the emergent laser beam. For example, if the spot of the outgoing laser beam of the second visible light laser 6 is located above, a conclusion is drawn that the pitch angle of the outgoing laser beam of the second visible light laser 6 is larger, whereas if the spot of the outgoing laser beam of the second visible light laser 6 is located below, a conclusion is drawn that the pitch angle of the outgoing laser beam of the second visible light laser 6 is smaller; the pitching angle of the first adjusting table 1 is adjusted through the pitching direction rotation freedom degree of one or two of the second adjusting tables 2;
if the light spot of the outgoing laser beam of the second visible light laser 6 is located at the left side, the rotation angle of the outgoing laser beam of the second visible light laser 6 is adjusted through the rotation degree of freedom in the horizontal direction of one or both of the first adjustment table 1 and the second adjustment table 2, so that the beam center of the outgoing laser beam of the second visible light laser 6 moves to the beam center direction of the outgoing laser beam of the first visible light laser 4; when the size of the light spot intercepted on the light-transmitting plate 3 is observed to be equal to the aperture size of the first diaphragm 5 and the second diaphragm 7 at any point along the transmission direction of the emergent laser beams between the first visible light laser 4 and the second visible light laser 6, and the color of the light spot intercepted on the light-transmitting plate 3 presents the synthesized color of the emergent laser beams of the first visible light laser 4 and the second visible light laser 6, the conclusion that the beam centers of the two emergent laser beams coincide is obtained.
Example 4
A beam coincidence adjustment method is similar to embodiment 3, except that the aperture sizes of the first diaphragm 5 and the second diaphragm 7 are repeatedly reduced; then, the light spots of the outgoing laser beams of the first and second visible light lasers 4 and 6 are observed on the light-transmitting plate 3, and the movement amount or the rotation angle of one or two of the first and second adjustment tables 1 and 2 in the dimension is adjusted by the degree of freedom of the one or more of the first and second adjustment tables 1 and 2 according to the deviation direction and the deviation degree of the light spots of the outgoing laser beams of the second visible light lasers 6.
It is also possible to use a laser having an outgoing laser beam wavelength of 632.8nm as the first visible light laser 4.
It is also possible to use a laser having an outgoing laser beam wavelength of 532nm for the second visible light laser 6.
I.e. by using two different wavelengths of visible laser light, e.g. one each of the red and green laser light sources, i.e. the first visible light laser 4 and the second visible light laser 6, two other colors of visible light sources may be used, and two aperture stops (Pinhole diaphragm) of variable aperture, i.e. the first stop 5 and the second stop 7, and a set of first and second adjustment stages 1, 2 with horizontal, vertical, pitch, swivel and translation functions, a five-dimensional adjustment frame for the optical fiber path may be used for adjusting the spatial orientation state of one of the beams.
Specifically, the first diaphragm 5 and the red laser as the first visible light laser 4 may be fixed on the first adjustment table 1, and the second diaphragm 7 and the green laser as the second visible light laser 6 may be fixed on the second adjustment table 2; the first diaphragm 5 and the second diaphragm 7 are respectively fixed near the light output ports of the red light laser and the green light laser and serve as the emitting points of the two laser beams; and then adjusting the aperture sizes of the first diaphragm 5 and the second diaphragm 7 to be equal, selecting the laser beam with smaller spot cross section from the red laser and the green laser, adjusting the aperture sizes of the first diaphragm 5 and the second diaphragm 7 to be smaller than the smaller laser beam with the spot cross section, enabling the center of the laser beam with the spot cross section to coincide with the center point of the diaphragm, and keeping coaxiality. Passing the red light passing through the first diaphragm 5 through the second diaphragm 7 (i.e. through the target point of the red light beam); the green light beam coinciding with the center of the second diaphragm 7 is then adjusted to pass through the first diaphragm 5 in the opposite direction to the transmission direction of the red light beam (i.e. the target point of the green light beam) so that the two light beams coincide.
When the adjustment is performed, the laser beam is vertically intercepted along the laser beam propagation direction of the red laser through a light-transmitting plate 3 with a graduated scale, such as a transparent glass plate, if the laser spot size on the transparent glass plate is larger than the aperture size of the diaphragm, and two red light spots and green light spots are displayed, when the green light spot is on the upper side, the pitch angle of the green light beam is indicated to be bigger, otherwise, the pitch angle of the green light beam is smaller, as shown in fig. 1; and if the green light spot is on the left side, adjusting the rotation angle of the light beam superposition adjusting device to move to the optical axis direction of the red light beam. When the optical axes of the two red and green beams are completely coincident, the size of a light spot intercepted on the transparent glass plate is observed at any point along the transmission direction of the light beams, the light spot is consistent with the aperture size of the diaphragm, and a yellow light spot appears, as shown in fig. 2, and the two light beams are initially coincident in the center of the light beams. In order to achieve the purpose of fine adjustment, the light detector 601 is used for replacing a green light source to receive red light signals, the aperture of the two diaphragms is reduced, a light beam superposition adjusting device where the light detector 601 is positioned is adjusted, so that the signal received by the detector is maximized, the aperture of the diaphragm is further reduced, and the adjusting steps are continued until the superposition of the optical axes of the two laser beams on the required aperture is achieved. The power and wavelength of the used light source are not limited, and the light source can be used as an indicator light path of a substitute of the invisible light source, and the light source is changed back to the invisible light source after the light beams are adjusted and overlapped, so that the method is suitable for the light beam overlapping adjustment of the invisible light.
Example 5
A light beam superposition adjusting method, based on embodiment 3 or embodiment 4, further removing the light-transmitting plate 3; replacing the second visible light laser 6 with a photodetector 601, mounting the photodetector 601 on the second adjustment table 2, and reducing the aperture sizes of the first diaphragm 5 and the second diaphragm 7; then, the received signal value of the optical detector 601 is observed, and the movement amount or rotation angle of one or two dimensions of the first adjusting table 1 and the second adjusting table 2 is adjusted through the degree of freedom of the one or more dimensions of the first adjusting table 1 and the second adjusting table 2 until the received signal of the optical detector 601 reaches the maximum value.
Example 6
In the light beam superposition adjustment method according to any one of embodiments 3 to 5, further, an invisible light source is replaced by the second visible light laser 6 and is mounted on the second adjustment table 2 after the light beam superposition adjustment, so as to realize superposition of the emergent laser beams of the invisible light source and the first visible light laser 4.
The working principle of the beam superposition adjustment and the beam superposition adjustment method in the above embodiment is that a straight line principle is determined by utilizing any two points in space, an emission point and a target point are respectively established on two beams A and B to be superposed, when the target point of the beam A is superposed with the center of the optical section of the emission point of the beam B, and when the target point of the beam B is superposed with the center of the optical section of the emission point of the beam A, the centers of the beam A and the beam B are shown to be on the same straight line, so that the accurate superposition of the beams can be realized; the method is not only suitable for superposition adjustment of strong and weak visible light beams, but also suitable for superposition adjustment of invisible light beams in a band, and is simple, convenient, quick and easy to operate as long as the invisible light source is replaced by a visible light laser on an optical fiber link to perform the above-mentioned superposition adjustment process of the light beams, and the invisible light source is replaced after the superposition of the light beam adjustment.
The beam superposition adjustment and the beam superposition adjustment method of the above embodiments, in order to explore the possibilities of optical path design and technical implementation by fast alignment superposition between beams in many optical experiments and optical path establishment processes, without pursuing the problem of beam superposition in the aspect of precisely quantitative beam coupling, propose a simple, fast and practical coupling scheme to ideally solve the problem in the aspect of practical operation. The technical problems of implementing the operation in the aspects of realizing the fast alignment and coupling of light beams among complex optical systems by utilizing a reasonable light beam superposition adjusting device are solved, as described above, the red light and the green light respectively represent the light beams with two optical axes needing to be superposed, and in order to improve the adjusting precision, the first diaphragm 5 and the second diaphragm 7 with adjustable apertures are used for adjusting the light paths; by utilizing the characteristic of straight line propagation of light beams and according to the principle of determining a straight line at any two points in space, the cross section centers of two propagation light beams which belong to different optical systems can be accurately overlapped by means of a light beam adjusting system, and finally, the output ends of the two light beams are connected in a solidifying way; the problems of adjustment accumulation errors formed by the fact that optical axes are not strictly coincident and low light transmission efficiency of an optical system are solved, the method is suitable for fine adjustment of various geometric optical paths and optical paths of optical fibers and bulk optical devices, and has great significance on weak signal optical systems.
In the beam superposition adjustment and the beam superposition adjustment method of the foregoing embodiments, the first diaphragm 5 and the first visible laser 4 may be fixedly installed on the top surface of the first adjustment table 1, the second diaphragm 7 and the second visible laser 6 or the optical detector 601 may be installed on the top surface of the second adjustment table 2, and the light-transmitting plate 3 may be a rectangular plate. The graduation scale is preferably arranged in the middle of the light-transmitting plate 3. The graduated scale may be a cross-shaped scale. In the adjustment process, the center of the cross scale may be used as a reference point, the beam center of the first visible light laser 4, the aperture center of the first diaphragm 5, the beam center of the second visible light laser 6 or the receiving surface center of the photodetector 601, and the aperture center of the second diaphragm 7 are on the same horizontal line with the center of the cross scale, and in the adjustment process, the beam cross section spot center of the first visible light laser 4, the beam cross section spot center of the second visible light laser 6 and the center of the cross scale are adjusted to coincide.
The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.
Claims (10)
1. The light beam superposition adjusting device comprises a first adjusting table and a second adjusting table, and is characterized in that a first visible light laser (4) and a first diaphragm (5) with an adjustable aperture are sequentially and fixedly arranged on the first adjusting table, and a second diaphragm (7) and a second visible light laser (6) are sequentially arranged on the second adjusting table (2); a light-transmitting plate (3) is arranged between the first diaphragm (5) and the second diaphragm (7); the wavelength of the outgoing laser beam of the second visible light laser (6) is different from the wavelength of the outgoing laser beam of the first visible light laser (4); the first adjusting table (1) and the second adjusting table (2) have one or more than two adjusting degrees of freedom of horizontal X-direction translation degrees of freedom, horizontal Y-direction translation degrees of freedom, vertical direction translation degrees of freedom, pitching direction rotation degrees of freedom and horizontal direction rotation degrees of freedom;
the steps of the beam superposition adjustment are as follows:
a second diaphragm (7) and a second visible light laser (6) are arranged on a second adjusting table (2);
the aperture sizes of the first diaphragm (5) and the second diaphragm (7) are adjusted to be equal, and then the smaller spot cross-section diameter in the spot cross-section diameters of the emergent laser beams in the first visible light laser (4) and the second visible light laser (6) is taken and compared with the aperture sizes of the first diaphragm (5) and the second diaphragm (7), so that the aperture diameter is smaller than the smaller spot cross-section diameter; the spot centers of the first visible light laser (4) and the second visible light laser (6) are respectively overlapped with the aperture center points of the first diaphragm (5) and the second diaphragm (7);
the emergent laser beam of the first visible light laser (4) passes through the first diaphragm (5) and the second diaphragm (7); adjusting the outgoing laser beam of the second visible light laser (6) to reversely pass through the first diaphragm (5) against the outgoing laser beam of the first visible light laser (4); so that the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are overlapped;
intercepting the emergent laser beams of the first visible light laser (4) along the propagation direction thereof through the light-transmitting plate (3);
if the spot size of the emergent laser beams on the light-transmitting plate (3) is larger than the aperture sizes of the first diaphragm (5) and the second diaphragm (7), the two emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are respectively shown; the light spots of the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are observed on the light-transmitting plate (3), and the movement amount or the rotation angle of one or more than two dimensions of the first adjusting table (1) and the second adjusting table (2) is adjusted according to the deviation direction and the deviation degree of the light spots of the emergent laser beams of the second visible light laser (6).
2. A beam overlap adjustment device according to claim 1, characterized in that the light-transmitting plate (3) is provided with a graduated scale.
3. A beam coincidence adjusting device as claimed in claim 1 or 2, characterized in that the first adjusting stage (1) and the second adjusting stage (2) are mounted on an optical bench (8).
4. A beam coincidence adjusting device as claimed in claim 1 or 2, characterized in that the light-transmitting plate (3) is mounted on a light-transmitting plate holder (9), the light-transmitting plate holder (9) being mounted on the optical bench (8).
5. A beam coincidence adjusting method, characterized in that the beam coincidence adjusting device as claimed in any one of claims 1 to 4 is employed, comprising the steps of,
a second diaphragm (7) and a second visible light laser (6) are arranged on a second adjusting table (2);
the aperture sizes of the first diaphragm (5) and the second diaphragm (7) are adjusted to be equal, and then the smaller spot cross-section diameter in the spot cross-section diameters of the emergent laser beams in the first visible light laser (4) and the second visible light laser (6) is taken and compared with the aperture sizes of the first diaphragm (5) and the second diaphragm (7), so that the aperture diameter is smaller than the smaller spot cross-section diameter; the spot centers of the first visible light laser (4) and the second visible light laser (6) are respectively overlapped with the aperture center points of the first diaphragm (5) and the second diaphragm (7);
the emergent laser beam of the first visible light laser (4) passes through the first diaphragm (5) and the second diaphragm (7); adjusting the outgoing laser beam of the second visible light laser (6) to reversely pass through the first diaphragm (5) against the outgoing laser beam of the first visible light laser (4); so that the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are overlapped;
intercepting the emergent laser beams of the first visible light laser (4) along the propagation direction thereof through the light-transmitting plate (3);
if the spot size of the emergent laser beams on the light-transmitting plate (3) is larger than the aperture sizes of the first diaphragm (5) and the second diaphragm (7), the two emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are respectively shown; the light spots of the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are observed on the light-transmitting plate (3), and the movement amount or the rotation angle of one or more than two dimensions of the first adjusting table (1) and the second adjusting table (2) is adjusted according to the deviation direction and the deviation degree of the light spots of the emergent laser beams of the second visible light laser (6).
6. A beam coincidence adjusting method as claimed in claim 5, characterized in that the aperture sizes of the first diaphragm (5) and the second diaphragm (7) are repeatedly reduced; then, the light spots of the emergent laser beams of the first visible light laser (4) and the second visible light laser (6) are observed on the light-transmitting plate (3), and the movement amount or the rotation angle of one or more than two dimensions of the first adjusting table (1) and the second adjusting table (2) is adjusted according to the deviation direction and the deviation degree of the light spots of the emergent laser beams of the second visible light laser (6).
7. The beam overlap adjustment method according to claim 5 or 6, characterized in that the first visible light laser (4) is a laser having an outgoing laser beam wavelength of 632.8 nm.
8. A beam overlap adjustment method according to claim 5 or 6, characterized in that the second visible light laser (6) is a laser emitting laser beams having a wavelength of 532 nm.
9. A beam coincidence adjusting method as claimed in claim 5 or 6, characterized in that the light-transmitting plate (3) is removed; replacing the second visible light laser (6) with a light detector (601), mounting the light detector (601) on the second adjusting table (2), and reducing the aperture sizes of the first diaphragm (5) and the second diaphragm (7); then, the received signal value of the optical detector (601) is observed, and the movement amount or the rotation angle of one or more dimensions of the first adjusting table (1) and the second adjusting table (2) is adjusted through the degree of freedom of the one or more dimensions of the first adjusting table (1) and the second adjusting table (2) until the received signal of the optical detector (601) reaches the maximum value.
10. A beam overlap adjustment method according to claim 5 or 6, characterized in that the overlapping of the invisible light source with the outgoing laser beam of the first visible light laser (4) is achieved by replacing the second visible light laser (6) and mounting it on the second adjustment table (2) after beam overlap adjustment.
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| CN114624899B (en) * | 2022-03-10 | 2023-09-29 | 歌尔光学科技有限公司 | Optical system calibration method, optical system calibration device, and storage medium |
| CN115185042B (en) * | 2022-07-14 | 2023-08-08 | 中国科学院上海硅酸盐研究所 | Rapid light coupling device and rapid light coupling method of optical fiber collimator |
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