CN113253472A - Reference light generating device and method for light beam synthesis system - Google Patents
Reference light generating device and method for light beam synthesis system Download PDFInfo
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Abstract
The invention belongs to the technical field of laser, and particularly discloses a reference light generating device and method for a light beam synthesis system. The device comprises a reference light laser, a plurality of groups of main laser sub-beam lasers, a conversion optical element, a dispersion element and a light adjusting element. The method comprises the following steps: the method comprises the steps of outputting reference light and main laser sub-beams emitted by a plurality of groups of main laser sub-beam lasers in parallel along the same direction, collimating and separating the reference light and the plurality of groups of main laser sub-beams, adjusting the scattering angle of the reference light according to the emission angle of the plurality of groups of main laser sub-beams passing through a dispersion element and the wavelength of the reference light, enabling the reference light passing through a light adjusting element to be incident to an incident area on the dispersion element again at a specified angle, and realizing the common-caliber output with the plurality of groups of main laser sub-beams after passing through the dispersion element. The invention can make the generated reference light energy penetrate through the whole light path of the beam combining system and have the same path as the main laser, and can accurately represent the main laser state of the beam combining system.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a reference light generating device and method for a light beam synthesis system, which can be applied to directions of light beam integrated debugging, stable control, wavefront correction and the like of the laser beam synthesis system.
Background
In recent years, with the rapid development of laser technology and material technology, in the fields of industrial manufacturing, national defense safety and the like, higher and higher requirements are put forward on the power and brightness of a laser system, and the power brightness of single-path laser cannot meet related application requirements. The spectrum synthesis technology utilizes a synthesis element to synthesize multiple paths of laser with different wavelengths into one beam for output, and becomes an important way for improving the laser brightness and power of a laser system.
In the engineering application of a laser beam synthesis system, the synthesized main laser is usually an infrared band, has the characteristics of high power and invisible band, and needs a low-power visible reference light with the same caliber as the main laser to represent the state of the main laser for convenient debugging, detection and control. For example, in the integrated debugging of the laser beam combining system, the pointing, position and light spot conditions of the main laser cannot be directly observed in the integrated debugging process due to the invisibility of the main laser, and the real-time adjustment correctness in the system debugging process cannot be directly and intuitively judged, so that the difficulty of the integrated debugging is invisibly increased, and the efficiency of the integrated debugging is reduced. If one low-power visible reference light which has the same caliber with the main laser and can represent the state of the main laser guides the integrated debugging of the laser beam synthesis system, the pointing, position and light spot conditions of the reference light can be observed and known in real time, and the light spot reaches the target position and state by guiding the system adjustment, so that the difficulty of the integrated debugging of the system is greatly reduced, and the integrated debugging efficiency is increased; in the working process of the laser beam synthesis system, the position and the direction of the main laser are changed due to environmental vibration, mechanical structure deformation and temperature change, so that the performance of the main laser is influenced. In order to ensure the stability of the output laser beam, the main laser needs to be sampled and detected to obtain the position and direction change condition of the main laser, so as to control the active optical element to correct and realize the stability of the output laser beam. However, due to the high power characteristic of the main laser, the sampling detection of the main laser is very complicated, and generally needs to be attenuated for many times, which increases the complexity of the system. If one low-power reference light with the same aperture as the main laser represents the state of the main laser, the main laser is replaced by detecting the position and the pointing change condition of the reference light, so that the detection difficulty can be greatly reduced, and the system complexity is reduced; in the operation of the laser beam combining system, the optical element generates surface shape distortion under the thermal coupling disturbance of the optical machine, so that the beam quality of the main laser is degraded, and in order to ensure high beam quality output, the wave front of the laser needs to be detected to obtain the wave front distortion condition, so as to control the deformable mirror to compensate. Because the main laser is synthesized by multiple paths of laser with different wavelengths, the phase of the main laser cannot be detected, and the wavefront distortion condition cannot be obtained. If one low-power reference light with the same aperture as the main laser light represents the state of the main laser light, the wave front distortion of the reference light is detected to replace the main laser light, so that the problem that the phase of the synthesized laser light cannot be detected can be solved, and the detection and compensation of the surface shape distortion can be realized.
In the laser beam combining technology, the main laser and the reference light are generally different in wave band, and due to the dispersion effect of the combining element, the main laser and the reference light are separated due to the difference of diffraction angles after passing through the combining element, so that a beam of reference light which is output by sharing the aperture with the main laser cannot be directly obtained. The reference light in the existing light beam synthesis system can not penetrate through the whole light path, and can only be represented in a segmented mode, so that the reference light beam synthesis system has certain limitation.
Disclosure of Invention
In view of the above drawbacks or needs for improvement in the prior art, the present invention provides a reference light generating apparatus and method for a beam combining system, which can pass generated reference light through the entire optical path of the beam combining system, have the same path as the main laser, and can accurately represent the main laser state of the beam combining system, and provide a beam of reference light that can represent the main laser state for the laser beam combining system. The invention has good application value in the aspects of beam integration debugging, stable control, wavefront correction and the like of the laser beam synthesis system.
To achieve the above object, according to one aspect of the present invention, there is provided a reference light generating apparatus for a beam combining system, including a reference light laser, a plurality of sets of main laser sub-beam lasers, a conversion optical element, a dispersion element, and a light adjusting element, wherein,
the reference light laser and the multiple groups of main laser sub-beam lasers are arranged in an array mode, so that reference light emitted by the reference light laser and main laser sub-beams emitted by the multiple groups of main laser sub-beam lasers are output in parallel along the same direction;
the conversion optical element is used for collimating the output reference light and the multiple groups of main laser sub-beams and then irradiating an incidence area on the dispersion element at a specified angle;
the dispersion element is used for combining a plurality of groups of main laser sub-beams, and meanwhile, as the main laser and the reference light have different wavelengths, the main laser and the reference light are separated through the dispersion element, and the reference light is incident on the light adjusting element after being acted by the dispersion element;
the light adjusting element is used for adjusting the emergent angle of the reference light according to the emergent angles of the multiple groups of main laser sub-beams after passing through the dispersion element and the wavelength of the reference light, so that the reference light after passing through the light adjusting element is incident to the incident area on the dispersion element again at a specified angle, and the common-aperture output of the reference light and the multiple groups of main laser sub-beams is realized after passing through the dispersion element.
Further preferably, the reference light laser is a fiber laser or a semiconductor laser, and the reference light output by the reference light laser is in a visible light band or an infrared band.
As a further preference, the reference light has a different wavelength than the main laser sub-beam.
As a further preference, the number of the main laser sub-beam lasers is not less than 2.
As a further preferred, the conversion optical element includes a collimating member and an optical path converting member.
Further preferably, the dispersion element is a transmission dispersion element or a reflection dispersion element.
It is further preferred that the light conditioning element is a prism or a mirror group.
More preferably, the light adjusting element adjusts the emission angle of the reference light according to a diffraction equation:
wherein alpha is the incident angle of the reference light, beta is the emergent angle of the reference light,
is the center wavelength of the reference light,
is the diffraction constant.
According to another aspect of the present invention, there is also provided a reference light generating method for a beam combining system, comprising the steps of:
s1, outputting the reference light and the main laser sub-beams emitted by the multiple groups of main laser sub-beam lasers in parallel along the same direction;
s2, after the output reference light and the multiple groups of main laser sub-beams are collimated, the reference light and the multiple groups of main laser sub-beams irradiate an incidence area on the dispersion element at a specified angle;
s3, the dispersion element combines a plurality of groups of main laser sub-beams, and the main laser and the reference light are separated after passing through the dispersion element due to different wavelengths of the main laser and the reference light, and the reference light is incident on the light adjusting element after being acted by the dispersion element;
and S4, the light adjusting element is used for adjusting the emergent angle of the reference light according to the emergent angle of the multiple groups of main laser sub-beams after passing through the dispersion element and the wavelength of the reference light, so that the reference light after passing through the light adjusting element is incident on the incident area on the dispersion element again at a specified angle, and the common-aperture output with the multiple groups of main laser sub-beams is realized after passing through the dispersion element.
Further preferably, in step S1, the reference light has a different wavelength from the main laser sub-beam;
in step S4, the light adjusting element adjusts the scattering angle of the reference light according to a diffraction equation:
wherein alpha is the incident angle of the reference light, beta is the emergent angle of the reference light,
is the center wavelength of the reference light,
is the diffraction constant.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention combines the main laser beams after the reference light beams with different wavelengths and the main laser sub-beams are acted by the dispersion element, the main laser beams and the reference light beams are separated due to different wavelengths, and then the angle of the reference light is adjusted by the light adjusting element to return to the same action area of the dispersion element at a specific angle, thereby realizing the common-caliber output of the main laser beams and the reference light beams. The invention can provide a beam of reference light for representing the main laser state for the laser beam synthesis system, has the advantages of simple structure and flexible application, and has good application value in the aspects of beam integration debugging, stable control, wavefront correction and the like of the laser beam synthesis system.
2. The reference light energy generated by the invention penetrates through the whole light path of the light beam synthesis system and has the same path as the main laser, and the main laser state of the light beam synthesis system can be represented more accurately. Meanwhile, the generated reference light and the main laser are output in the same caliber, and the main laser state can be effectively represented through an optical element through which the main laser passes, so that the working complexity in the aspects of light beam integration debugging, stable control, wavefront correction and the like of a laser beam synthesis system can be reduced, and the working efficiency is improved.
3. The reference light and the main laser are arranged in parallel in an array mode, the reference light and the main laser which are emitted in parallel are collimated and then are subjected to diffraction separation, then the light path of the reference light is adjusted according to a diffraction equation, so that the reference light and a plurality of groups of main laser sub-beams are combined again and output in a common caliber mode, in the main light path, the reference light can penetrate through the whole light path of the light beam synthesis system and is in the same path as the main laser, and the main laser state of the light beam synthesis system can be represented accurately. The whole device and the method are simple, easy to debug and good in robustness.
Drawings
FIG. 1 is a schematic diagram of a reference light generating apparatus for a beam combining system according to a preferred embodiment of the present invention;
fig. 2 is a schematic optical path diagram of a reference light generating apparatus for a beam combining system according to embodiment 1 of the present invention;
FIG. 3 is a schematic view of the array of light beams referred to in FIG. 2;
fig. 4 is a schematic optical path diagram of a reference light generating apparatus for a beam combining system according to embodiment 2 of the present invention;
fig. 5 is a schematic view of the beam array referred to in fig. 4.
In all the figures, the same reference numerals denote the same features, in particular: 1-beam array, 2-conversion optics, 3-dispersion elements, 4-light conditioning elements, 101-reference laser, 102, 103, 104-main laser sub-beam laser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a reference light generating method for a beam combining system, which is used for enabling generated reference light to penetrate through the whole light path of the beam combining system and have the same path as main laser, so that the main laser state of the beam combining system can be accurately represented, and a beam of reference light capable of representing the main laser state is provided for the laser beam combining system. As shown in fig. 1, a reference light generating apparatus for a beam combining system according to an embodiment of the present invention includes a beam array 1, a reference light laser 101, main laser sub-beam lasers 102, 103, and 104, a conversion optical element 2, a dispersion element 3, and a light adjusting element 4. The main laser sub-beam lasers are provided with a plurality of main laser sub-beam lasers to form a plurality of groups of main laser sub-beam lasers which are arranged in an array. The reference light laser 101 and the multiple groups of main laser sub-beam lasers are arranged in an array, so that reference light emitted by the reference light laser 101 and main laser sub-beams emitted by the multiple groups of main laser sub-beam lasers are output in parallel along the same direction, and the conversion optical element 2 is used for collimating the output reference light and the multiple groups of main laser sub-beams and irradiating an incident area on the dispersion element 3 at a specified angle; the dispersion element (3) is used for combining a plurality of groups of main laser sub-beams, and meanwhile, as the main laser and the reference laser have different wavelengths, the main laser and the reference light are separated through the dispersion element, the reference light is incident on the light adjusting element under the action of the dispersion element, and the reference light is incident on the light adjusting element 4 under the action of the dispersion element 3; the light adjusting element 4 is configured to adjust a scattering angle of the reference light according to an exit angle of the multiple groups of main laser beams after passing through the dispersion element 3 and a wavelength of the reference light, so that the reference light after passing through the light adjusting element 4 is incident on the incident region on the dispersion element 3 again at a specified angle, and the reference light passes through the dispersion element 3 to realize the common-aperture output with the multiple groups of main laser beams.
More specifically, in the present invention, the laser beams output by the reference laser 101 and the main laser sub-beam lasers 102, 103, and 104 are shaped and arranged, so as to ensure that the reference light and the main laser sub-beam output light are output in parallel along the same direction, thereby forming the beam array 1. The light beams output by the reference laser 101 and the main laser sub-beam lasers 102, 103 and 104 are collimated at a certain angle by the conversion optical device 2 and are irradiated on the dispersion element 3, and the light beams of the main laser sub-beam lasers 102, 103 and 104 are combined into one light beam to be output based on the principle of optical dispersion. The outgoing wave band of the reference light laser 101 is not consistent with the main laser sub-beam lasers 102, 103 and 104, and the reference light laser is irradiated on the dispersion element 3 through the conversion optical device 2, and is separated from the main laser through the action of the dispersion element 3, and the reference light is incident on the reference light adjusting device 4, is incident on the same action area on the dispersion element 3 again after the angle is adjusted by the reference light adjusting device 4, and is acted again through the dispersion element 3 to realize the output with the same aperture as the main laser.
In the present invention, the reference laser 101 may be, but not limited to, a fiber laser and a semiconductor laser, and the wavelength band of the reference light emitted by the reference laser 101 may be, but not limited to, a visible light wavelength band and an infrared wavelength band, and has good wavelength stability and beam quality.
The main laser sub-beam lasers 102, 103, 104 may be, but not limited to, fiber lasers, semiconductor lasers, and the wavelength band may be, but not limited to, visible light band, infrared band, and the number of paths of the main laser sub-beam lasers may be multiple paths, but not limited to, 3 beams.
The laser bands emitted by the reference laser 101 and the main laser sub-beam lasers 102, 103 and 104 are not consistent and can have larger difference.
The conversion optical element 2 may be, but is not limited to, a transmission mirror, a reflection mirror, or a combination of multiple sets of mirrors, but functions to achieve output beam collimation of the reference light laser 101, the main laser sub-beam lasers 102, 103, 104 and incidence at an angle to the dispersion element 3. In one embodiment of the present invention, the conversion optical element 2 includes a collimating component and a light path converting component. The collimating component comprises a first lens and a second lens, the first lens and the second lens are arranged oppositely, the first lens is located between the laser source and the second lens, the thermal expansion coefficient of the first lens is smaller than that of the second lens, and laser emitted by the laser source forms collimated light after being refracted by the first lens and the second lens in sequence. More specifically, in this embodiment, the first lens has a first curved surface and a second curved surface that are opposite to each other, the second lens has a third curved surface and a fourth curved surface that are opposite to each other, the second curved surface is opposite to the third curved surface, the laser emitted by the laser source is refracted by the first curved surface, the second curved surface, the third curved surface and the fourth curved surface in sequence to form collimated light, the first curved surface and the second curved surface of the first lens are spherical surfaces, and the third curved surface and the fourth curved surface of the second lens are aspheric surfaces. Or the first lens is provided with a first curved surface and a second curved surface which are arranged in a back-to-back manner, the second lens is provided with a third curved surface and a fourth curved surface which are arranged in a back-to-back manner, the second curved surface is opposite to the third curved surface, laser emitted by the laser source forms collimated light after being refracted by the first curved surface, the second curved surface, the third curved surface and the fourth curved surface in sequence, the first curved surface and the second curved surface of the first lens are aspheric surfaces, and the third curved surface and the fourth curved surface of the second lens are aspheric surfaces. In another embodiment of the present invention, the collimating component includes a first lens, a second lens and a third lens arranged in sequence from left to right. The first lens and the second lens are meniscus-shaped, and the third lens is plano-convex lens. The first lens and the second lens have a meniscus concave surface as a light incident surface, a meniscus convex surface as a light emergent surface, the third lens has a plano-convex lens plane as a light incident surface, and the plano-convex lens convex surface as a light emergent surface. Of course, the conversion optical element 2 is not limited to the above embodiment, and other elements capable of realizing the collimation of the output beams of the reference laser and the main laser sub-beam laser and entering the dispersion element 3 at a certain angle are all suitable for the present invention.
In the present invention, the dispersion element 3 is a transmissive dispersion element or a reflective dispersion element. More specifically, in one embodiment of the present invention, the dispersive element 3 includes a diffraction grating constituted by a plurality of diffraction grating members each having a cross-sectional shape surrounded by any one of two straight lines and one curved line; the diffraction grating further includes a plurality of light shielding members each formed on a corresponding one of the diffraction grating members on a side of the diffraction grating member along any one of the straight line and the curved line of the cross-sectional shape. Wherein the light shielding element reduces zero-order transmitted light with respect to incident light. The light shielding member is formed by vapor-depositing metal on the diffraction grating member from an oblique direction on a side face of the diffraction grating member along any one of the straight line and the curved line of the cross-sectional shape. In another embodiment of the present invention, the dispersive element 3 is a triangular prism made of a transparent resin. In another embodiment of the present invention, the dispersive element 3 is a diffraction grating comprising a resin layer and a plurality of metal surfaces located within the resin layer, the metal surfaces being periodically arranged, each metal surface having an inclination angle at a given blaze angle with the film surface. Of course, the dispersive element 3 is not limited to the above-described embodiment, and other dispersive elements that can achieve laser diffraction are applicable to the present invention.
In the present invention, the light adjusting element 4 adjusts the scattering angle of the reference light according to the diffraction equation:
wherein alpha is the incident angle of the reference light, beta is the emergent angle of the reference light,
is the center wavelength of the reference light,
is the diffraction constant.
Specifically, the light adjusting element 4 may be, but not limited to, a prism or a mirror group, and functions to adjust the angle of the reference light output by the dispersion element 3 so as to return to the same operation region as the dispersion element 3 at a specific angle. More specifically, the light adjusting element 4 includes an exit angle measuring part and an angle adjusting part, wherein the angle adjusting part is a prism or a mirror group, and the prism or the mirror group is driven by an actuator. The exit angle measuring component is used for acquiring exit angles of the main laser sub-beams and the reference light after passing through the dispersion element according to a diffraction equation, then calculating an incident angle of the reference light returning to the dispersion element according to a difference value of the exit angles of the main laser sub-beams and the reference light, enabling the reference light after passing through the light adjusting element to be incident on an incident area on the dispersion element again at a specified angle, and realizing the common-aperture output with the multiple groups of main laser sub-beams after passing through the dispersion element.
In a preferred embodiment of the present invention, the angle adjusting component is two corresponding sets of mirrors, i.e. a first mirror and a second mirror, which are oppositely arranged, and the exit angle measuring component obtains the exit angle a of the main laser sub-beam after passing through the dispersion element according to the diffraction equation and the diffraction constant1The exit angle a of the reference light after passing through the dispersion element2Then a is added1As an input of the diffraction equation, an incident angle of the reference light returning to the dispersion element is calculated, and the swing of the second mirror is adjusted according to the incident angle so that the reference light is incident again to the incident area on the dispersion element at a specified angle.
According to another aspect of the present invention, there is also provided a reference light generating method for a beam combining system, comprising the steps of:
(1) and outputting the reference light and the main laser sub-beams emitted by the multiple groups of main laser sub-beam lasers in parallel along the same direction. Namely, a light beam array 1 is constructed, and laser beams output by a reference light laser 101 and main laser sub-beam lasers 102, 103 and 104 are shaped and arranged, so that the reference light and the main laser sub-beam output light are output in parallel along the same direction.
(2) And after the output reference light and the multiple groups of main laser sub-beams are collimated, the collimated light irradiates an incident area on the dispersion element at a specified angle. The light beams output by the reference laser 101 and the main laser sub-beam lasers 102, 103 and 104 are collimated at a certain angle by the conversion optical device 2 and are irradiated on the dispersion element 3, and the light beams of the main laser sub-beam lasers 102, 103 and 104 are combined into one light beam to be output based on the principle of optical dispersion.
(3) The dispersion element 3 is used for combining a plurality of groups of main laser sub-beams, and simultaneously, the main laser and the reference light are separated through the dispersion element 3 and the main laser and the reference light are incident on the light adjusting element 4 after the dispersion element 3 acts. The emission waveband of the reference light laser 101 is different from that of the main laser sub-beam lasers 102, 103 and 104, the reference light laser irradiates the dispersion element 3 through the conversion optical device 2, the reference light and the main laser are separated through the action of the dispersion element 3, and the reference light enters the reference light adjusting device 4.
(4) The light adjusting element is used for adjusting the emergent angle of the reference light according to the emergent angles of the multiple groups of main laser sub-beams after passing through the dispersion element and the wavelength of the reference light, so that the reference light after passing through the light adjusting element is incident to the incident area on the dispersion element again at a specified angle, and the common-aperture output of the reference light and the multiple groups of main laser sub-beams is realized after passing through the dispersion element. And adjusting the emergent angle of the reference light according to the emergent angles of the multiple groups of main laser sub-beams after passing through the dispersion element, the wavelength of the reference light and a diffraction equation, adjusting the angle by the reference light adjusting device 4, then re-entering the same action area on the dispersion element 3, and re-acting by the dispersion element 3 to realize the output of the same aperture with the main laser.
The above diffraction equation is:
wherein alpha is the incident angle of the reference light, beta is the emergent angle of the reference light,
is the center wavelength of the reference light,
is the diffraction constant.
The device and the method of the invention separate the reference light with different wavelengths and the main laser sub-beam through the action of the dispersion element, and then adjust the angle of the reference light by using the light adjusting element, so that the reference light returns to the same action area of the dispersion element at a specific angle and enters the same action area of the dispersion element, thereby realizing the common caliber output of the main laser and the reference light. The invention can provide a beam of reference light for representing the main laser state for the laser beam synthesis system, has the advantages of simple structure and flexible application, and has good application value in the aspects of beam integration debugging, stable control, wavefront correction and the like of the laser beam synthesis system.
Example 1
Referring to fig. 2 and fig. 3, fig. 2 is a diagram illustrating an embodiment of a method for realizing a beam-combined common-aperture output of main laser light and reference light, and fig. 3 is a layout diagram of a reference light laser and a main laser sub-beam laser according to embodiment 1.
In this embodiment, the reference light laser 101 and the main laser sub-beam lasers 102 and 103 form a beam array 1, wherein the reference light laser 101 is located at the center of the beam array 1, and the emission wavelength is 808 nm; the main laser sub-beam laser 102 is located 15.24mm on the left of the reference laser 101, the emission wavelength is 1045nm, the main laser sub-beam laser 103 is located 15.24mm on the right of the reference laser 101, and the emission wavelengths are 1065nm respectively.
The reference light and the main laser sub-beam are incident to the conversion optical element 2 in parallel, the conversion optical element 2 is a transmission mirror, and the focal length of the transmission mirror is 800 mm. The reference light and the main laser sub-beam are collimated by the conversion optical element 2 at a certain angle and then incident on the dispersion element 3, and the reticle of the dispersion element is 1000 line/mm. After the action of the dispersion element 3, the main laser sub-beams are combined into a beam of light to be output, and the reference light and the main laser light are separated and incident into the light adjusting element 4.
The light adjusting element 4 is composed of a mirror 401 and a mirror 402, in which the mirror 401 rotates 35.14 ° about its Y axis and the mirror 402 rotates 35.14 ° about its Y axis. The reference light returns to the dispersion element 3 after passing through the mirror 401 and the mirror 402, and is acted on by the dispersion element 3 again, thereby realizing the same aperture output as the main laser.
Example 2
Referring to fig. 4 and 5, fig. 4 is another embodiment of a method for realizing beam-combining common-aperture output of main laser light and reference light, and fig. 5 is a layout diagram of a reference light laser and a main laser sub-beam laser according to embodiment 2.
In this embodiment, the reference light laser 101 and the main laser sub-beam lasers 102, 103, and 104 form a beam array 1, wherein the reference light laser 101 is located at the center of the beam array 1, and the emission wavelength is 632 nm; the main laser sub-beam laser 102 is positioned 20mm at the left side of the reference light laser 101, and the emergent wavelength is 1037 nm; the main laser sub-beam laser 103 is positioned at the 10mm position on the right side of the reference light laser 101, and the emergent wavelengths are 1063nm respectively; the main laser sub-beam laser 104 is located 20mm to the right of the reference laser 101, and the emission wavelengths are 1072nm respectively.
The reference light and the main laser sub-beam are incident to the conversion optical element 2 in parallel, the conversion optical element 2 is a reflector, the focal length of the reflector is 1000mm, the reference light and the main laser sub-beam are collimated and incident to the dispersion element 3 through the conversion optical element 2 at a certain angle, and the reticle of the dispersion element is 1000 line/mm. After the action of the dispersion element 3, the main laser sub-beams are combined into a beam of light to be output, and the reference light and the main laser light are separated and incident into the light adjusting element 4.
The light adjustment member 4 is composed of a mirror 401 and a mirror 402, in which the mirror 401 is rotated by 44 ° about its X axis, and the mirror 402 is rotated by 44 ° about its X axis. The reference light returns to the dispersion element 3 after passing through the mirror 401 and the mirror 402, and is acted on by the dispersion element 3 again, thereby realizing the same aperture output as the main laser.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A reference light generating device for a beam combining system, comprising a reference light laser (101), a plurality of sets of main laser sub-beam lasers, a conversion optical element (2), a dispersion element (3), and a light adjusting element (4), wherein,
the reference light laser (101) and the multiple groups of main laser sub-beam lasers are arranged in an array mode, so that reference light emitted by the reference light laser (101) and main laser sub-beams emitted by the multiple groups of main laser sub-beam lasers are output in parallel along the same direction;
the conversion optical element (2) is used for collimating the output reference light and the multiple groups of main laser sub-beams and then irradiating an incidence area on the dispersion element (3) at a specified angle;
the dispersion element (3) is used for combining a plurality of groups of main laser sub-beams, and meanwhile, as the main laser and the reference laser have different wavelengths, the main laser and the reference light are separated through the dispersion element (3), and the reference light is incident on the light adjusting element (4) under the action of the dispersion element (3);
the light adjusting element (4) is used for adjusting the emergent angle of the reference light according to the emergent angle of the multiple groups of main laser sub-beams after passing through the dispersion element (3) and the wavelength of the reference light, so that the reference light after passing through the light adjusting element (4) is incident to the incident area on the dispersion element (3) again at a specified angle, and the common-aperture output of the multiple groups of main laser sub-beams is realized after passing through the dispersion element (3).
2. The reference light generating apparatus for a beam combining system according to claim 1, wherein the reference light laser (101) is a fiber laser or a semiconductor laser, and the reference light for output of the reference light laser (101) is in a visible light band or an infrared band.
3. The apparatus of claim 1, wherein the reference light has a different wavelength from the main laser beam.
4. The reference light generating apparatus for a beam combining system as claimed in claim 1, wherein the number of the main laser sub-beam lasers is not less than 2.
5. The reference light generating apparatus for a beam combining system according to claim 1, wherein the conversion optical element includes a collimating component and an optical path converting component.
6. The reference light generating device for a beam combining system according to claim 1, wherein the dispersion element (3) is a transmission dispersion element or a reflection dispersion element.
7. The reference light generating device of claim 1, wherein the light adjusting element (4) is a prism or a mirror group.
8. The reference light generating device for a beam combining system as set forth in claim 1, wherein the light adjusting element (4) adjusts the exit angle of the reference light according to a diffraction equation:
wherein alpha is the incident angle of the reference light, beta is the emergent angle of the reference light,
is the center wavelength of the reference light,
is the diffraction constant.
9. A reference light generating method for a beam combining system, comprising the steps of:
s1, outputting the reference light and the main laser sub-beams emitted by the multiple groups of main laser sub-beam lasers in parallel along the same direction;
s2, after the output reference light and the multiple groups of main laser sub-beams are collimated, the reference light and the multiple groups of main laser sub-beams irradiate an incident area on the dispersion element (3) at a specified angle;
s3, the dispersion element (3) combines a plurality of groups of main laser sub-beams, and meanwhile, due to the fact that the main laser and the reference laser have different wavelengths, the main laser and the reference light are separated through the dispersion element (3), and the reference light is incident on the light adjusting element (4) under the action of the dispersion element (3);
s4 the light adjusting element (4) is used for adjusting the emergent angle of the reference light according to the emergent angle of the multiple groups of main laser sub-beams after passing through the dispersion element (3) and the wavelength of the reference light, so that the reference light after passing through the light adjusting element (4) is incident on the incident area of the dispersion element (3) again at a specified angle, and the common-aperture output with the multiple groups of main laser sub-beams is realized after passing through the dispersion element (3).
10. The method of claim 9, wherein in step S1, the reference light has a different wavelength from the main laser sub-beam;
in step S4, the light adjusting element (4) adjusts the scattering angle of the reference light according to a diffraction equation:
wherein alpha is the incident angle of the reference light, beta is the emergent angle of the reference light,
is the center wavelength of the reference light,
is the diffraction constant.
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