CN111552087A - Method for coupling annular light beam with coaxial reflective optical system - Google Patents
Method for coupling annular light beam with coaxial reflective optical system Download PDFInfo
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- CN111552087A CN111552087A CN202010333549.8A CN202010333549A CN111552087A CN 111552087 A CN111552087 A CN 111552087A CN 202010333549 A CN202010333549 A CN 202010333549A CN 111552087 A CN111552087 A CN 111552087A
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- coaxial
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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
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H13/00—Means of attack or defence not otherwise provided for
- F41H13/0043—Directed energy weapons, i.e. devices that direct a beam of high energy content toward a target for incapacitating or destroying the target
- F41H13/005—Directed energy weapons, i.e. devices that direct a beam of high energy content toward a target for incapacitating or destroying the target the high-energy beam being a laser beam
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0804—Catadioptric systems using two curved mirrors
- G02B17/0812—Catadioptric systems using two curved mirrors off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0864—Catadioptric systems having non-imaging properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
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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
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
Abstract
A method for coupling a ring beam with a coaxial reflective optical system relates to a beam coupling method. The beam expanding device comprises a fiber laser, a beam expanding lens group, a phase modulator, a coaxial secondary reflector, a coaxial primary reflector, a phase-splitting lens group, a coaxial secondary reflector, a Keplerian telescope structure and a phase-expanding lens group, wherein the beam expanding lens group expands beams of output beams of the fiber laser and is used for matching the relationship between the diameter of the output beams of the fiber laser and the aperture of the phase modulator, the phase modulator modulates the expanded beams into annular beams, the annular beams are synthesized and split by the beam-combining lens and then are refracted to the fast reflector, the annular beams are quickly scanned in an object space by the fast reflector, the rear surface of the annular beams penetrates through a through hole formed in the center of the coaxial primary reflector and are refracted to the front surface of the coaxial secondary reflector, the coaxial secondary reflector. The annular light beam modulated by the phase is matched with the pupil of the coaxial reflective optical system, so that the aperture utilization rate is improved.
Description
Technical Field
The invention relates to a light beam coupling method, in particular to a method for coupling a ring-shaped light beam with a coaxial reflective optical system, belonging to the technical field of high-power laser beam emission.
Background
The high-power laser equipment utilizes a light beam emitting system to emit high-energy laser to a target body so as to damage the target. The laser beam emitting system is an important part in high-power laser equipment, and mainly has the main functions of realizing high-magnification beam expansion of laser beams and compressing the spatial divergence angle of laser and realizing long-distance laser convergence.
The laser beam emitting system of the high-power laser comprises a transmission type optical system, a coaxial reflection type optical system and an off-axis reflection type optical system. Compared with other modes, the coaxial reflective optical system has the advantages of small volume, light weight, symmetrical structure and high stability, and for example, the coaxial reflective light beam emission scheme is adopted by the American vehicle-mounted laser system. The coaxial reflective optical system has the defects that the central blocking exists, the laser transmission efficiency is influenced, a large caliber is occupied in the scanning process of the fast reflecting mirror, and the utilization rate of the caliber is low.
The hollow light beam generated by methods such as phase modulation has the characteristic that the central light intensity is zero in the transmission direction, can be just matched with a coaxial reflective optical system for use, and solves the problems of low transmission efficiency and aperture utilization rate of the coaxial reflective optical system.
Therefore, a method is needed for fully playing the technical advantages of a coaxial reflection optical system, aiming at the requirements of miniaturization and light weight of a high-power laser system, combining a hollow light beam with coaxial reflection based on a pupil matching technology, solving the problem of aperture loss and shielding caused by fast-reflection mirror scanning, enhancing the aperture utilization rate and laser transmission efficiency and improving the action efficiency of the laser system.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method for coupling the annular light beam with the coaxial reflective optical system, the annular light beam modulated by the phase is matched with the pupil of the coaxial reflective optical system, the pupil coupling design of secondary imaging is adopted, the aperture utilization rate is improved, the influence of central blocking of the coaxial reflective optical system on the transmission efficiency is avoided, and the laser transmission efficiency is high.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for coupling a ring-shaped light beam with a coaxial reflective optical system structurally comprises a fiber laser, a beam expander set, a phase modulator, a beam combiner, a fast reflector, a coaxial secondary reflector and a coaxial primary reflector, wherein the coaxial secondary reflector and the coaxial primary reflector form the coaxial reflective optical system, and the method comprises the following steps:
the beam expanding lens group is used for expanding beams output by the optical fiber laser and matching the relationship between the diameter of the output beam of the optical fiber laser and the aperture of the phase modulator, the phase modulator modulates the expanded beam into an annular beam, the annular beam is synthesized and split by the beam combining lens and then refracted to the fast reflecting mirror, the annular beam passes through a perforation arranged in the center of the coaxial main reflector by the back surface and is refracted to the front surface of the coaxial secondary reflector after being rapidly scanned in an object space by the fast reflecting mirror, the coaxial secondary reflector and the coaxial main reflector are both concave paraboloidal mirrors, a Keplerian telescope structure is formed by adopting a secondary imaging design, the coaxial secondary reflector is refracted to the front surface of the coaxial main reflector by the front surface of the coaxial secondary reflector, and finally the coaxial main reflector is output by the front surface of the coaxial main reflector.
Compared with the prior art, the invention has the beneficial effects that: the coaxial reflective optical system keeps the advantages of stable structure, miniaturization and light weight of the coaxial reflective optical system, matches annular light beams modulated by phases with pupils of the coaxial reflective optical system with a central barrier, adopts a pupil coupling design of secondary imaging, meets the requirements of beam expanding magnification, field range, wave aberration and structural symmetry, improves the aperture utilization rate, avoids the influence of the central barrier of the coaxial reflective optical system on transmission efficiency, has high laser transmission efficiency, and can meet the requirements of platforms such as airborne pod and the like on the miniaturization of the structure size.
Drawings
FIG. 1 is a schematic diagram of the construction of the present invention;
FIG. 2 is a schematic representation of the Gaussian beam profile of the fiber laser output of the present invention;
FIG. 3 is a schematic diagram of the ring beam profile after modulation by the phase modulator of the present invention;
FIG. 4 is a schematic view of beam refraction for a coaxial reflective optical system of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention discloses a method for coupling a ring-shaped light beam with a coaxial reflective optical system, which comprises an optical fiber laser 1, a beam expander lens group 2, a phase modulator 3, a beam combiner 4, a fast reflector 5, a coaxial secondary reflector 6 and a coaxial primary reflector 7, wherein the coaxial secondary reflector 6 and the coaxial primary reflector 7 form the coaxial reflective optical system,
referring to fig. 1, a light beam output by a fiber laser 1 is expanded by a beam expander set 2, and is used for matching the relationship between the diameter of the light beam output by the fiber laser 1 and the aperture of a phase modulator 3, referring to fig. 2, the intensity distribution of the light beam output by the fiber laser 1 is gaussian, other distributions are also applicable, but the gaussian light beam is more obvious, the phase modulator 3 is a diffractive optical element, and modulates the expanded light beam into an annular light beam, referring to fig. 3, the annular light beam is a circularly symmetric airy light beam generated by a fourier space pure phase coding method, the annular light beam is synthesized and split by a beam combiner 4 and then refracted to a fast reflector 5, after the annular light beam is rapidly scanned in an object space by the fast reflector 5, referring to fig. 4, the rear surface passes through a perforation arranged in the center of a coaxial primary reflector 7 and is refracted to the front side surface of a coaxial secondary reflector 6, and the coaxial primary reflector 7 are both concave, a Keplerian telescope structure is formed by adopting a secondary imaging design, the Keplerian telescope structure is refracted to the front side surface of a coaxial main reflector 7 through the front side surface of a coaxial secondary reflector 6, the Keplerian telescope structure is finally output through the front side surface of the coaxial main reflector 7, a coaxial reflective optical system realizes pupil coupling through secondary imaging, an entrance pupil is designed at the position of a quick reflecting mirror 5, an exit pupil is coupled to the position of the coaxial main reflector 7, light beams are unchanged at the position of an outlet of the system in the scanning process of the quick reflecting mirror 5, the aperture utilization rate of the system is increased, dielectric films are plated on the optical surfaces, the beam expander set 2 is a transmission film, the beam combiner 4, the quick reflecting mirror 5 and the coaxial reflective optical system are high-reflective films, the transmission film material is composed of hafnium oxide and silicon dioxide with high and low refractive indexes, and the high-reflective.
Example (b):
the fiber laser 1 has an output beam diameter of 15mm, a wavelength of 1064nm, and a beam mass M2Less than 1.2, the power is 1KW, the intensity distribution of the light beam is Gaussian light beam, other distributions are also applicable, but the intensity distribution is more obvious for the Gaussian light beam;
the beam expanding lens group 2 is used for matching the relation between the diameter of the output light beam of the optical fiber laser 1 and the diameter of the phase modulator 3, the beam expanding magnification is 3 times, the input aperture is 20mm, the output aperture is 60mm, based on a Galilean telescope structure, a transmission type fused quartz material is adopted, a transmission film consisting of hafnium oxide and silicon dioxide with high and low refractive indexes is plated on the surface, the optical transmittance of single-layer film laser is superior to 99.9%, and the overall laser transmission efficiency of the beam expanding lens group 2 is superior to 99.2%;
the phase modulator 3 is a diffractive optical element, the modulated light beam is an annular light beam, the material is fused quartz, and a circular symmetric Airy light beam is generated by adopting a Fourier space pure phase coding method, and referring to FIG. 3, the overall laser transmission efficiency of the phase modulator 3 is 96%;
the beam combining mirror 4 is used for combining and splitting laser beams and other imaging beams, adopts a transmission type fused quartz material, and is plated with a high-reflection film consisting of thallium oxide and silicon dioxide with high and low refractive indexes on the surface;
the fast reflection mirror 5 is used for realizing the fast scanning of laser beams in an object space, and the mirror body is made of microcrystalline glass and is plated with a high reflection film consisting of thallium oxide and silicon dioxide with high and low refractive indexes;
the coaxial reflective optical system is characterized in that the input aperture is 60mm, the output aperture is 360mm, the focal length of a coaxial main reflector 7 is 540mm, the focal length of a coaxial secondary reflector 6 is 90mm, the materials are all microcrystalline glass and are all concave parabolic mirrors, a Keplerian telescope structure is formed by adopting a secondary imaging design, the surfaces of the coaxial main reflector and the coaxial secondary reflector are plated with high-reflection films consisting of thallium oxide and silicon dioxide with high and low refractive indexes, and the laser transmission efficiency of the film layer is superior to 99.9%;
the total beam expansion multiplying power is 18, wherein the beam expansion multiplying power is 3 times, the coaxial reflection type optical system is 6 times, the single-layer film laser transmission efficiency is more than 99.5%, the total laser transmission efficiency is more than 95%, and the laser transmission efficiency of each part is shown in table 1.
TABLE 1 laser transmission efficiency table
| Assembly | Efficiency of laser transmission |
| Beam expanding lens group | 99.2％ |
| Phase modulator | 96％ |
| Beam combining mirror | 99.5％ |
| Fast reflecting mirror | 99.9％ |
| Coaxial main reflector | 99.9％ |
| Coaxial secondary reflector | 99.9％ |
| Aggregate laser transmission efficiency | 95.2％ |
Compared with a conventional coaxial reflective optical system with an input aperture of 60mm and an output aperture of 360mm, for a Gaussian beam, the transmission efficiency caused by the central blocking of the coaxial reflective optical system is only about 80%.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A method of coupling an annular beam of light with a coaxial reflective optical system, comprising: the coaxial reflection type optical system structurally comprises an optical fiber laser (1), a beam expanding lens group (2), a phase modulator (3), a beam combining lens (4), a fast reflecting lens (5), a coaxial secondary reflecting mirror (6) and a coaxial main reflecting mirror (7), wherein the coaxial secondary reflecting mirror (6) and the coaxial main reflecting mirror (7) form a coaxial reflection type optical system, and the method comprises the following steps:
the light beam output by the optical fiber laser (1) is expanded by the beam expander set (2), used for matching the relationship between the output beam diameter of the fiber laser (1) and the caliber of the phase modulator (3), the phase modulator (3) modulates the expanded light beam into an annular light beam, the annular light beam is synthesized and split by the beam combiner (4) and then refracted to the fast reflector (5), and after the annular light beam is rapidly scanned in an object space by the fast reflector (5), the back surface of the coaxial secondary reflector is refracted to the front side surface of the coaxial secondary reflector (6) through a through hole arranged at the center of the coaxial primary reflector (7), the coaxial secondary reflector (6) and the coaxial main reflector (7) are both concave parabolic mirrors, a Keplerian telescope structure is formed by adopting a secondary imaging design, and the coaxial secondary reflector (6) is reflected to the front side surface of the coaxial main reflector (7) through the front side surface of the coaxial secondary reflector (6) and finally output through the front side surface of the coaxial main reflector (7).
2. A method of coupling a ring beam with a coaxial reflective optical system as claimed in claim 1, wherein: the optical fiber laser (1) outputs a Gaussian beam with the beam intensity distribution.
3. A method of coupling a ring beam with a coaxial reflective optical system as claimed in claim 1, wherein: the annular light beam modulated by the phase modulator (3) is a circularly symmetric Airy light beam generated by a Fourier space pure phase coding method.
4. A method of coupling a ring beam with a coaxial reflective optical system as claimed in claim 1, wherein: the beam expander set (2) is based on a Galilean telescopic structure, adopts a transmission type fused quartz material, and is plated with a transmission film consisting of hafnium oxide and silicon dioxide with high and low refractive indexes on the surface.
5. A method of coupling a ring beam with a coaxial reflective optical system as claimed in claim 1, wherein: the coaxial secondary reflector (6) and the coaxial main reflector (7) are made of microcrystalline glass, and the surfaces of the coaxial secondary reflector and the coaxial main reflector are plated with high-reflection films composed of thallium oxide and silicon dioxide with high and low refractive indexes.
6. A method of coupling a ring beam with a coaxial reflective optical system as claimed in claim 1, wherein: the beam combining mirror (4) is made of a transmission type fused quartz material, and a high-reflection film composed of thallium oxide and silicon dioxide with high and low refractive indexes is plated on the surface of the beam combining mirror.
7. A method of coupling a ring beam with a coaxial reflective optical system as claimed in claim 1, wherein: the fast reflecting mirror (5) is made of microcrystalline glass, and a high reflecting film consisting of thallium oxide and silicon dioxide with high and low refractive indexes is plated on the surface of the fast reflecting mirror.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903801A (en) * | 2021-01-27 | 2021-06-04 | 南开大学 | Ion photodissociation method and device |
| CN112923797A (en) * | 2021-01-20 | 2021-06-08 | 西安应用光学研究所 | Small common-path directional infrared counterrotating turret based on reflector stabilization |
| CN114624870A (en) * | 2022-02-16 | 2022-06-14 | 哈尔滨新光光电科技股份有限公司 | High-energy laser coaxial reflection type telescopic system with secondary mirror with hole |
| WO2023231504A1 (en) * | 2022-05-31 | 2023-12-07 | 华为技术有限公司 | Optical atp antenna and optical signal processing method |
| CN117192706A (en) * | 2023-10-23 | 2023-12-08 | 中国人民解放军国防科技大学 | Supercontinuum laser system for realizing hollow beam emission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117192706A (en) * | 2023-10-23 | 2023-12-08 | 中国人民解放军国防科技大学 | Supercontinuum laser system for realizing hollow beam emission |
| CN117192706B (en) * | 2023-10-23 | 2024-03-19 | 中国人民解放军国防科技大学 | Supercontinuum laser system for realizing hollow beam emission |
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Application publication date: 20200818 |