CN116243497A - Off-axis four-reflection telescope for space laser interferometry and adjustment method - Google Patents
Off-axis four-reflection telescope for space laser interferometry and adjustment method Download PDFInfo
- Publication number
- CN116243497A CN116243497A CN202211740938.8A CN202211740938A CN116243497A CN 116243497 A CN116243497 A CN 116243497A CN 202211740938 A CN202211740938 A CN 202211740938A CN 116243497 A CN116243497 A CN 116243497A
- Authority
- CN
- China
- Prior art keywords
- mirror
- mirrors
- zygo interferometer
- standard
- adjustment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004556 laser interferometry Methods 0.000 title claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 230000004075 alteration Effects 0.000 claims description 40
- 239000000758 substrate Substances 0.000 claims description 4
- 238000005305 interferometry Methods 0.000 description 13
- 230000033001 locomotion Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0647—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0647—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors
- G02B17/0657—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The invention relates to the field of optical system adjustment, in particular to an off-axis four-reflection telescope adjustment method for space laser interferometry. By means of the modular adjustment mode, the adjustment freedom degree is reduced, the adjustment difficulty is reduced, and the adjustment efficiency is improved. The invention also provides an off-axis four-reflection telescope for space laser interferometry.
Description
Technical Field
The invention relates to the field of optical system adjustment, in particular to an off-axis four-reflection telescope for space laser interferometry and an adjustment method.
Background
The spatial gravitational wave detection was proposed to trace back to the LISA project of the 20 th century, which was cooperated by NASA and ESA in europe, aiming at detecting gravitational wave signals of 30 Hz to 1 Hz. As shown in fig. 1, the space gravitational wave astronomical platform is composed of three spacecrafts forming an equilateral triangle formation, and runs along a daily orbit, the centroid falls on the earth orbit, and the space is 250 kilometers apart. Each spacecraft comprises two test masses, and in order to enable the test masses to do free suspension movement, the spacecraft adopts a drag-free control technology to protect the test masses from being disturbed by external force. The laser links are adopted among the spacecrafts, and the relative movement among the test qualities of different spacecrafts is measured through a laser interferometry system. When gravitational wave passes through, the optical path between the test masses is changed, and the change of the optical path is read out by a laser interferometry system, so that gravitational wave signals are inverted.
A full link interferometry system is shown in fig. 2, wherein the core load comprises a laser, an interferometric optical platform, a phase meter, a telescope, and an inertial sensor. Telescope is one of the core components of the spatial interferometry system, which is the key load to achieve long baseline inter-satellite interferometry. As part of the scientific interferometer, a telescope is used to accept and demagnify the beam from the remote spacecraft into a flat-top beam and transmit it to an optical platform to interfere with the local gaussian beam. Meanwhile, the small-beam-waist Gaussian beam of the local optical platform is expanded into the large-beam-waist Gaussian beam after passing through the telescope optical system, so that the divergence angle of the large-beam-waist Gaussian beam is reduced, the remote spacecraft receives more energy, and shot noise is reduced. Unlike conventional telescope systems for imaging, the technical requirements of telescope systems as part of interferometry systems are more focused on the optical path stability index as well as on the stray light index, where an index for the telescope wavefront quality requires wave aberration better than λ/30 (λ=1064 nm).
The telescope adopts an off-axis four-reflection afocal system, and the diameter of an entrance pupil is as follows: 400mm; working wavelength: 1064nm; capture field of view (ω/2): 200 mu rad; scientific field of view (ω/2): 8 mu rad; angular magnification: -100 times. The telescope primary mirror adopts a paraboloid, the secondary mirror adopts a hyperboloid, and the three mirrors and the four mirrors adopt spherical surfaces. Parallel incident light rays with the aperture of 400mm are converged into a point after sequentially passing through a card-type system consisting of a main mirror and a secondary mirror, and continuously spread from the point, and the aperture of emergent parallel light rays is reduced to 5mm after passing through a collimation system consisting of a rear three mirror and a rear four mirror.
The telescope is assembled and adjusted by adopting a self-aligning interference detection technology, namely, a small-caliber standard plane wave emitted by the ZYGO interferometer is converted into a large-caliber plane wave after being expanded by an off-axis four-reflection optical system, a standard plane mirror in front of the system is reflected, and the large-caliber plane wave returns to the interferometer to interfere with reference light of the interferometer through the off-axis four-reflection optical system again, so that an interference pattern is obtained. And then, the position of each reflecting mirror is adjusted to match with the position adjustment of the standard plane mirror and the ZYGO interferometer until the wave aberration index of the interference image meets the optical index requirement.
Each reflecting mirror has 6 degrees of freedom adjustment, namely 3 translational and 3 rotational, 4 reflecting mirrors have 24 degrees of freedom adjustment, and 2 rotational adjustment of a standard plane mirror are added, 2 translational adjustment and 2 rotational adjustment of the ZYGO interferometer are added, and the off-axis four-reflection optical system is assembled and adjusted to have 30 degrees of freedom adjustment. The adjustment amount is increased, so that the adjustment difficulty and adjustment time of the optical system are increased, the optical system is a afocal system, the aberration of the system cannot be compensated through focusing, and the adjustment difficulty is far greater than that of a focused system. If an integral adjustment mode is adopted, 30 degrees of freedom adjustment amounts are provided, and a plurality of reflectors are provided with a plurality of 6 degrees of freedom adjustment devices, the more the reflective elements of the system are required to be provided with the adjustment devices; more serious, the adjustment difficulty is increased along with the increase of the adjustment freedom degree, the adjustment degree cannot be ensured, and the adjustment quality is difficult to reach the index requirement.
Disclosure of Invention
In view of this, an off-axis four-reflection telescope and an adjustment method for spatial laser interferometry are provided in the embodiments of the present invention.
The invention provides an off-axis four-reflecting telescope adjustment method for space laser interferometry, which comprises a primary mirror, a secondary mirror, a three mirror and a four mirror, wherein the primary mirror adopts a paraboloid, the secondary mirror adopts a hyperboloid, the three mirror and the four mirror adopt spherical surfaces, parallel incident rays with the aperture of 400mm are converged into a convergence point after sequentially passing through a clamping system formed by the primary mirror and the secondary mirror, and continuously transmitted from the convergence point, and the caliber of emergent parallel rays is reduced to 5mm after passing through a collimation system formed by the three mirror and the four mirrors;
the small-caliber standard plane wave sent by the ZYGO interferometer is changed into a large-caliber plane wave after being expanded by the four mirrors, the three mirrors, the secondary mirror and the primary mirror, reflected by the standard plane mirror arranged in front of the off-axis four-reflection telescope, and returned to the ZYGO interferometer by the primary mirror, the secondary mirror, the three mirrors and the four mirrors to interfere with reference light of the ZYGO interferometer, so that an interference pattern is obtained;
and adjusting the positions of the main mirror, the secondary mirror, the three mirrors and the four mirrors to match with the position adjustment of the standard plane mirror and the ZYGO interferometer until the wave aberration index of the interferogram meets the optical index requirement, so as to complete the adjustment.
As an alternative, the method further comprises:
adjusting and fixing the main mirror and the standard plane mirror;
the main mirror adopts a parabolic form and has a unique focus, spherical waves emitted by the ZYGO interferometer are changed into plane waves after being reflected by the main mirror, the plane waves return along an original path after being reflected by the standard plane mirror, and the plane waves enter the ZYGO interferometer to interfere with reference light of the ZYGO interferometer, so that an interference pattern is obtained;
and fixing the positions of the standard plane mirror and the main mirror by adjusting the standard plane mirror and the ZYGO interferometer until the wave aberration of the interferogram meets the design index requirement of the main mirror.
As an alternative, the method further comprises:
installing a secondary mirror;
the spherical wave sent by the ZYGO interferometer is changed into plane wave after passing through the secondary mirror and the main mirror, and the plane wave returns along the original path after being reflected by the standard plane mirror, and enters the ZYGO interferometer to interfere with the reference light of the ZYGO interferometer, so that an interference pattern is obtained;
and the positions of the main mirror and the standard plane mirror are fixed, and the positions of the ZYGO interferometer and the secondary mirror are continuously adjusted until the wave aberration of the interferogram meets the design index requirement, and the positions of the secondary mirror are fixed.
As an alternative, the method further comprises:
the three mirrors and the four mirrors are assembled and modulated into a group;
the three mirrors and the four mirrors are in spherical forms and have unique sphere centers;
respectively placing two standard balls at the sphere center positions of the three mirrors and the four mirrors, wherein the two standard balls are respectively a first standard ball and a second standard ball;
the spherical wave sent by the ZYGO interferometer returns along the original path after being reflected by the first standard sphere, the spherical wave enters the ZYGO interferometer to interfere with the reference light of the ZYGO interferometer to obtain an interference pattern, and the spherical center of the spherical wave of the ZYGO interferometer coincides with the spherical center of the first standard sphere by adjusting the position of the ZYGO interferometer until the wave aberration of the interference pattern is minimum;
after the first standard sphere is removed, the spherical wave of the ZYGO interferometer continues to propagate, returns along an original path after passing through the three mirrors, enters the ZYGO interferometer to interfere with reference light to obtain an interference pattern, and the positions of the three mirrors are fixed by adjusting the positions of the three mirrors until the wave aberration of the interference pattern meets the design requirement;
the spherical wave sent by the ZYGO interferometer returns along the original path after being reflected by the second standard sphere, the spherical wave enters the ZYGO interferometer to interfere with the reference light of the ZYGO interferometer to obtain an interference pattern, and the spherical center of the spherical wave of the ZYGO interferometer coincides with the spherical center of the second standard sphere by adjusting the position of the ZYGO interferometer until the wave aberration of the interference pattern is minimum;
after the second standard sphere is removed, the spherical wave of the ZYGO interferometer continues to propagate, returns along an original path after passing through the four mirrors, enters the ZYGO interferometer to interfere with reference light of the ZYGO interferometer to obtain an interference pattern, and the positions of the four mirrors are fixed by adjusting the positions of the four mirrors until wave aberration of the interference pattern meets design requirements;
and the three mirrors and the four mirrors are assembled and adjusted to form a mirror group, and the three mirrors and the four mirrors are fixed on the same substrate.
As an alternative, the method further comprises:
setting and adjusting an off-axis four-reflector system;
placing a lens group consisting of the three lenses and the four lenses at a preset light path position to construct an adjustment system;
and adjusting the lens group formed by the three lenses and the four lenses and the ZYGO interferometer until the system wave aberration index meets the optical system requirement, and finishing the adjustment.
In a second aspect, the invention provides an off-axis four-reflection telescope for space laser interferometry, which is obtained by performing adjustment by adopting the off-axis four-reflection telescope adjustment method for space laser interferometry.
The invention relates to the field of optical system adjustment, in particular to an off-axis four-reflection telescope adjustment method for space laser interferometry. By means of the modular adjustment mode, the adjustment freedom degree is reduced, the adjustment difficulty is reduced, and the adjustment efficiency is improved. The invention also provides an off-axis four-reflection telescope for space laser interferometry.
Drawings
FIG. 1 is a schematic diagram of a LISA scheme according to the prior art;
FIG. 2 is a schematic diagram of an interferometry system according to the prior art;
FIG. 3 is a schematic diagram of an off-axis four-reflector self-aligning interferometry in an off-axis four-reflector interferometry method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of self-aligning interferometry of a primary mirror and a standard plane mirror in an off-axis four-reflector interferometry method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of self-aligning interferometry of secondary mirror, primary mirror and standard plane mirror in an off-axis four-reflector interferometry method according to an embodiment of the present invention;
fig. 6 is a schematic diagram of three-mirror and four-mirror interferometry in an off-axis four-mirror interferometry method for spatial laser interferometry according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The terms first, second, third, fourth and the like in the description and in the claims and in the above drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 3, an off-axis four-reflection telescope adjustment method for space laser interferometry is provided in the embodiment of the present invention, where the off-axis four-reflection telescope includes a primary mirror 1, a secondary mirror 2, a three mirror 3, and a four mirror 4, where the primary mirror 1 adopts a paraboloid, the secondary mirror 2 adopts a hyperboloid, the three mirror 3 and the four mirror 4 adopt a sphere, parallel incident light rays with an aperture of 400mm sequentially pass through a card system formed by the primary mirror 1 and the secondary mirror 2, and then are converged into a convergence point 7, and continue to propagate from the convergence point 7, and after passing through a collimation system formed by the three mirror 3 and the four mirror 4, the caliber of the emergent parallel light rays is reduced to 5mm;
the small-caliber standard plane wave emitted by the ZYGO interferometer 6 is changed into a large-caliber plane wave after being expanded by the four mirrors 4, the three mirrors 3, the secondary mirror 2 and the primary mirror 1, reflected by the standard plane mirror 5 arranged in front of the off-axis four-reflecting mirror, and returned to the ZYGO interferometer 6 by the primary mirror 1, the secondary mirror 2, the three mirrors 3 and the four mirrors 4 to interfere with reference light of the ZYGO interferometer to obtain an interference pattern;
and the positions of the main mirror 1, the secondary mirror 2, the three mirrors 3 and the four mirrors 4 are adjusted to match with the position adjustment of the standard plane mirror 5 and the ZYGO interferometer 6 until the wave aberration index of the interferogram meets the optical index requirement, so that the adjustment is completed.
It should be noted that, the wave aberration index may be better than λ/30 (λ=1064nm) when the wave aberration index meets the optical index requirement, and one of ordinary skill in the art may flexibly select the wave aberration index, which is not limited thereto.
In some embodiments, the steps of adjusting and fixing the main mirror 1 and the standard plane mirror 5 include the following steps:
the main mirror 1 adopts a parabolic form and has a unique focus, spherical waves emitted by the ZYGO interferometer 6 are changed into plane waves after being reflected by the main mirror 1, and return along an original path after being reflected by the standard plane mirror 5, so that interference is generated between the ZYGO interferometer 6 and reference light of the ZYGO interferometer 6, and an interference pattern is obtained;
and fixing the positions of the standard plane mirror 5 and the main mirror 1 by adjusting the standard plane mirror 5 and the ZYGO interferometer 6 until the wave aberration of the interferogram meets the design index requirement of the main mirror.
In some embodiments, the step of mounting the secondary mirror 2 includes the following;
the spherical wave emitted by the ZYGO interferometer 6 is changed into plane wave after passing through the secondary mirror and the main mirror 1, and the plane wave returns along the original path after being reflected by the standard plane mirror 5, and enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6, so that an interference pattern is obtained;
the positions of the main mirror 1 and the standard plane mirror 5 are fixed, and the positions of the ZYGO interferometer 6 and the secondary mirror 2 are continuously adjusted until the wave aberration of the interferogram meets the design index requirement, and the positions of the secondary mirror 2 are fixed.
In some embodiments, the step of adjusting the three mirrors 3, 4 into groups comprises the following;
the three mirrors 3 and the four mirrors 4 are in spherical forms and have unique sphere centers;
two standard balls are respectively placed at the sphere center positions of the three mirrors 3 and the four mirrors 4, wherein the two standard balls are respectively a first standard ball 8 and a second standard ball 9;
the spherical wave emitted by the ZYGO interferometer 6 is reflected by the first standard sphere 8 and returns along the original path, the spherical wave enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6, an interference pattern is obtained, and the spherical center of the spherical wave of the ZYGO interferometer 6 coincides with the spherical center of the first standard sphere 8 by adjusting the position of the ZYGO interferometer 6 until the wave aberration of the interference pattern is minimum;
after the first standard sphere is removed, the spherical wave of the ZYGO interferometer 6 continuously propagates, returns along the original path after passing through the three mirrors 3, and enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6 to obtain an interference pattern, and the position of the three mirrors 3 is fixed by adjusting the position of the three mirrors 3 until the wave aberration of the interference pattern meets the design requirement;
the spherical wave emitted by the ZYGO interferometer 6 is reflected by the second standard sphere 9 and returns along the original path, the spherical wave enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6, an interference pattern is obtained, and the spherical center of the spherical wave of the ZYGO interferometer 6 coincides with the spherical center of the second standard sphere 9 by adjusting the position of the ZYGO interferometer 6 until the wave aberration of the interference pattern is minimum;
after the second standard sphere 9 is removed, the spherical wave of the ZYGO interferometer 6 continues to propagate, returns along the original path after passing through the four mirrors 4, enters the ZYGO interferometer to interfere with the reference light of the ZYGO interferometer to obtain an interference pattern, and the position of the four mirrors 4 is fixed by adjusting the position of the four mirrors 4 until the wave aberration of the interference pattern meets the design requirement;
and the three mirrors 3 and the four mirrors 4 are assembled and adjusted to form a mirror group, and the three mirrors 3 and the four mirrors 4 are fixed on the same substrate.
In some embodiments, the step of adjusting the off-axis four-anti-telescope system includes the following;
placing a lens group consisting of the three lenses 3 and the four lenses 4 at a preset light path position to construct an adjustment system;
and adjusting the lens group formed by the three lenses 3 and the four lenses 4 and the ZYGO interferometer 6 until the wave aberration index of the system meets the requirement of an optical system, and finishing the adjustment.
The interferograms mentioned in the adjustment steps are not distinguished, and the wave aberration can be determined by obtaining the interferograms by the ZYGO interferometer 6 during adjustment, so that the index requirements can be satisfied, which is not limited.
The embodiment of the invention also provides an off-axis four-reflector adjustment method for space laser interferometry, which comprises the following steps:
s1, installing, adjusting and fixing a main mirror 1 and a standard plane mirror 5;
as shown in connection with fig. 4, the primary mirror 1 takes the form of a paraboloid with a unique focal point. The spherical wave emitted by the ZYGO interferometer 6 is changed into plane wave after being reflected by the main mirror 1, and returns along the original path after being reflected by the standard plane mirror 5, and enters the ZYGO interferometer 6 to interfere with the reference light, so that an interference pattern is obtained. The standard plane mirror 5 (2 rotational degree of freedom adjustment amounts, pitching and azimuth) and the ZYGO interferometer 6 (3 translational motions plus 2 rotational degree of freedom adjustment amounts) are adjusted until the wave aberration of the interferogram meets the design index requirement of the main mirror 1, and the positions of the standard plane mirror 5 and the main mirror 1 can be fixed at the moment. This step requires only 7 degrees of freedom adjustment.
S2, installing and adjusting secondary mirror 2
Referring to fig. 5, spherical waves emitted from the ZYGO interferometer 6 are changed into plane waves after passing through the secondary mirror 2 and the primary mirror 1, reflected by the standard plane mirror 5, and returned along the original path, and enter the ZYGO interferometer 6 to interfere with the reference light, thereby obtaining an interference pattern. Because the positions of the main mirror 1 and the standard plane mirror 5 are fixed, only the positions of the ZYGO interferometer 6 (3 translational motions plus 2 rotational degrees of freedom adjustment) and the secondary mirror 2 (3 translational motions plus 3 rotational degrees of freedom adjustment) need to be adjusted at the moment until the wave aberration of the interferogram meets the design index requirement, and the position of the secondary mirror 2 is basically determined. This step requires only 11 degrees of freedom adjustment.
S3, three-mirror 3 and four-mirror 4 assembling and modulating group
As shown in fig. 6, the three-mirror 3 and the four-mirror 4 are in spherical form and have a unique sphere center. First, standard balls 8 and 9 are accurately placed at the spherical centers of the three-mirror 3 and the four-mirror 4, respectively. The spherical wave emitted by the ZYGO interferometer 6 is reflected by the standard sphere 8 and returns along the original path, and enters the ZYGO interferometer 6 to interfere with the reference light, so that an interference pattern is obtained. By adjusting the position of the ZYGO interferometer 6 until the wave aberration of the interferogram is minimized, the center of the spherical wave of the ZYGO interferometer 6 coincides with the center of the standard sphere 8. After the standard sphere 8 is removed, the spherical wave of the ZYGO interferometer 6 continues to propagate, returns along the original path after encountering the three mirrors 3, enters the ZYGO interferometer 6 to interfere with the reference light to obtain an interference pattern, and the position of the three mirrors 3 (3 translational motions plus 2 rotational degree of freedom adjustment amounts) is adjusted until the wave aberration of the interference pattern meets the design requirement, and at the moment, the position of the three mirrors 3 can be fixed.
Two standard balls are respectively placed at the sphere center positions of the three mirrors 3 and the four mirrors 4, wherein the two standard balls are respectively a first standard ball 8 and a second standard ball 9;
the spherical wave emitted by the ZYGO interferometer 6 is reflected by the first standard sphere 8 and returns along the original path, the spherical wave enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6, an interference pattern is obtained, and the spherical center of the spherical wave of the ZYGO interferometer 6 coincides with the spherical center of the first standard sphere 8 by adjusting the position of the ZYGO interferometer 6 until the wave aberration of the interference pattern is minimum;
after the first standard sphere 8 is removed, the spherical wave of the ZYGO interferometer 6 continues to propagate, returns along the original path after passing through the three mirrors 3, and enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6 to obtain an interference pattern, and the position of the three mirrors 3 is fixed by adjusting the position of the three mirrors 3 until the wave aberration of the interference pattern meets the design requirement;
the spherical wave emitted by the ZYGO interferometer 6 is reflected by the second standard sphere 9 and returns along the original path, the spherical wave enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6, an interference pattern is obtained, and the spherical center of the spherical wave of the ZYGO interferometer 6 coincides with the spherical center of the second standard sphere 9 by adjusting the position of the ZYGO interferometer 6 until the wave aberration of the interference pattern is minimum;
after the second standard sphere 9 is removed, the spherical wave of the ZYGO interferometer 6 continues to propagate, returns along the original path after passing through the four mirrors 4, and enters the ZYGO interferometer 6 to interfere with the reference light of the ZYGO interferometer 6 to obtain an interference pattern, and the position of the four mirrors 4 is fixed by adjusting the position of the four mirrors 4 until the wave aberration of the interference pattern meets the design requirement;
after the three-mirror 3 and the four-mirror 4 are assembled and adjusted, the three-mirror 3 and the four-mirror 4 form a mirror group, and then the three-mirror 3 and the four-mirror 4 are fixed on the same substrate. This step requires only 5 degrees of freedom adjustment.
S4, mounting and adjusting off-axis four-reflection telescope system
The lens group consisting of the three lenses 3 and the four lenses 4 is placed at the position in the optical path of fig. 3, and the adjustment system shown in fig. 3 is constructed. And adjusting a lens group (6 degrees of freedom adjustment) formed by the three lenses 3 and the four lenses 4 and the ZYGO interferometer 6 (2 translational motions plus 2 rotational degrees of freedom adjustment) until the system wave aberration index meets the optical system requirement. This step requires only 10 degrees of freedom adjustment.
The off-axis four-reflection telescope adjusting method for space laser interferometry provided by the embodiment of the invention is characterized in that a standard plane mirror and a parabolic assembly are assembled and adjusted into a group, a secondary mirror and a group are assembled and adjusted into two groups, a three-mirror and a four-mirror are assembled and adjusted into three groups, and finally the two groups and the three groups are assembled and adjusted into a group to form an optical system. By means of the modular adjustment mode, the adjustment freedom degree is reduced, the adjustment difficulty is reduced, and the adjustment efficiency is improved.
Correspondingly, the embodiment of the invention also provides an off-axis four-reflection telescope for space laser interferometry, which is obtained by adopting the off-axis four-reflection telescope adjustment method for space laser interferometry.
The off-axis four-reflection telescope for space laser interferometry provided by the embodiment of the invention reduces the adjustment freedom degree, reduces the adjustment difficulty and improves the adjustment efficiency by a modular adjustment mode.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present disclosure may be performed in parallel, sequentially, or in a different order, so long as the desired result of the technical solution of the present disclosure is achieved, and the present disclosure is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (6)
1. The off-axis four-reflecting telescope adjustment method for space laser interferometry is characterized in that the off-axis four-reflecting telescope comprises a primary mirror, a secondary mirror, a three mirror and a four mirror, wherein the primary mirror adopts a paraboloid, the secondary mirror adopts a hyperboloid, the three mirror and the four mirror adopt spherical surfaces, parallel incident rays with the aperture of 400mm are converged into a convergence point after sequentially passing through a clamping system formed by the primary mirror and the secondary mirror, and continuously spread from the convergence point, and the caliber of emergent parallel rays is reduced to 5mm after passing through a collimation system formed by the three mirror and the four mirrors;
the small-caliber standard plane wave sent by the ZYGO interferometer is changed into a large-caliber plane wave after being expanded by the four mirrors, the three mirrors, the secondary mirror and the primary mirror, reflected by the standard plane mirror arranged in front of the off-axis four-reflection telescope, and returned to the ZYGO interferometer by the primary mirror, the secondary mirror, the three mirrors and the four mirrors to interfere with reference light of the ZYGO interferometer, so that an interference pattern is obtained;
and adjusting the positions of the main mirror, the secondary mirror, the three mirrors and the four mirrors to match with the position adjustment of the standard plane mirror and the ZYGO interferometer until the wave aberration index of the interferogram meets the optical index requirement, so as to complete the adjustment.
2. The method of off-axis four-mirror adjustment for spatial laser interferometry of claim 1, further comprising:
adjusting and fixing the main mirror and the standard plane mirror;
the main mirror adopts a parabolic form and has a unique focus, spherical waves emitted by the ZYGO interferometer are changed into plane waves after being reflected by the main mirror, the plane waves return along an original path after being reflected by the standard plane mirror, and the plane waves enter the ZYGO interferometer to interfere with reference light of the ZYGO interferometer, so that an interference pattern is obtained;
and fixing the positions of the standard plane mirror and the main mirror by adjusting the standard plane mirror and the ZYGO interferometer until the wave aberration of the interferogram meets the design index requirement of the main mirror.
3. The method of off-axis four-mirror adjustment for spatial laser interferometry of claim 2, further comprising:
installing a secondary mirror;
the spherical wave sent by the ZYGO interferometer is changed into plane wave after passing through the secondary mirror and the main mirror, and the plane wave returns along the original path after being reflected by the standard plane mirror, and enters the ZYGO interferometer to interfere with the reference light of the ZYGO interferometer, so that an interference pattern is obtained;
and the positions of the main mirror and the standard plane mirror are fixed, and the positions of the ZYGO interferometer and the secondary mirror are continuously adjusted until the wave aberration of the interferogram meets the design index requirement, and the position of the secondary mirror 2 is fixed.
4. The method of off-axis four-mirror adjustment for spatial laser interferometry of claim 1, further comprising:
the three mirrors and the four mirrors are assembled and modulated into a group;
the three mirrors and the four mirrors are in spherical forms and have unique sphere centers;
respectively placing two standard balls at the sphere center positions of the three mirrors and the four mirrors, wherein the two standard balls are respectively a first standard ball and a second standard ball;
the spherical wave sent by the ZYGO interferometer returns along the original path after being reflected by the first standard sphere, the spherical wave enters the ZYGO interferometer to interfere with the reference light of the ZYGO interferometer to obtain an interference pattern, and the spherical center of the spherical wave of the ZYGO interferometer coincides with the spherical center of the first standard sphere by adjusting the position of the ZYGO interferometer until the wave aberration of the interference pattern is minimum;
after the first standard sphere is removed, the spherical wave of the ZYGO interferometer continues to propagate, returns along an original path after passing through the three mirrors, enters the ZYGO interferometer to interfere with reference light to obtain an interference pattern, and the positions of the three mirrors are fixed by adjusting the positions of the three mirrors until the wave aberration of the interference pattern meets the design requirement;
the spherical wave sent by the ZYGO interferometer returns along the original path after being reflected by the second standard sphere, the spherical wave enters the ZYGO interferometer to interfere with the reference light of the ZYGO interferometer to obtain an interference pattern, and the spherical center of the spherical wave of the ZYGO interferometer coincides with the spherical center of the second standard sphere by adjusting the position of the ZYGO interferometer until the wave aberration of the interference pattern is minimum;
after the second standard sphere is removed, the spherical wave of the ZYGO interferometer continues to propagate, returns along an original path after passing through the four mirrors, enters the ZYGO interferometer to interfere with reference light of the ZYGO interferometer to obtain an interference pattern, and the positions of the four mirrors are fixed by adjusting the positions of the four mirrors until wave aberration of the interference pattern meets design requirements;
and the three mirrors and the four mirrors are assembled and adjusted to form a mirror group, and the three mirrors and the four mirrors are fixed on the same substrate.
5. The method of off-axis four-mirror adjustment for spatial laser interferometry of claim 1, further comprising:
setting and adjusting an off-axis four-reflector system;
placing a lens group consisting of the three lenses and the four lenses at a preset light path position to construct an adjustment system;
and adjusting the lens group formed by the three lenses and the four lenses and the ZYGO interferometer until the system wave aberration index meets the optical system requirement, and finishing the adjustment.
6. An off-axis four-reflection telescope for space laser interferometry, characterized in that it is obtained by performing adjustment by using the off-axis four-reflection telescope adjustment method for space laser interferometry according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211740938.8A CN116243497B (en) | 2022-12-30 | 2022-12-30 | Off-axis four-reflection telescope for space laser interferometry and adjustment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211740938.8A CN116243497B (en) | 2022-12-30 | 2022-12-30 | Off-axis four-reflection telescope for space laser interferometry and adjustment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116243497A true CN116243497A (en) | 2023-06-09 |
| CN116243497B CN116243497B (en) | 2024-04-12 |
Family
ID=86630584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211740938.8A Active CN116243497B (en) | 2022-12-30 | 2022-12-30 | Off-axis four-reflection telescope for space laser interferometry and adjustment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116243497B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030179443A1 (en) * | 2002-03-22 | 2003-09-25 | Cook Lacy G. | Compact four-mirror anastigmat telescope |
| US20110085235A1 (en) * | 2009-10-12 | 2011-04-14 | Raytheon Company | All-reflective relayed focal telescope derived from the first two mirrors of an afocal three-mirror anastigmat |
| CN104360492A (en) * | 2014-11-24 | 2015-02-18 | 中国航空工业集团公司洛阳电光设备研究所 | Adjusting method of off-axis four-reflector optical system |
| CN105242387A (en) * | 2015-10-26 | 2016-01-13 | 中国科学院西安光学精密机械研究所 | Large view field off-axis three-reflector system and adjusting method |
| CN109407263A (en) * | 2017-08-17 | 2019-03-01 | 北京遥感设备研究所 | A kind of high-precision Method of Adjustment for the off-axis collimated optical system that is all-trans |
| CN110737103A (en) * | 2019-10-31 | 2020-01-31 | 中国科学院长春光学精密机械与物理研究所 | large-caliber off-axis catadioptric multichannel optical system assembling and adjusting method |
| CN113917669A (en) * | 2021-09-08 | 2022-01-11 | 中国科学院西安光学精密机械研究所 | Off-axis reflection type telescopic system and installation and adjustment detection device and method thereof |
| CN115166932A (en) * | 2022-06-30 | 2022-10-11 | 北京空间机电研究所 | Optical axis adjusting method of large-caliber long-focus-distance axial optical system |
-
2022
- 2022-12-30 CN CN202211740938.8A patent/CN116243497B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030179443A1 (en) * | 2002-03-22 | 2003-09-25 | Cook Lacy G. | Compact four-mirror anastigmat telescope |
| US20110085235A1 (en) * | 2009-10-12 | 2011-04-14 | Raytheon Company | All-reflective relayed focal telescope derived from the first two mirrors of an afocal three-mirror anastigmat |
| CN104360492A (en) * | 2014-11-24 | 2015-02-18 | 中国航空工业集团公司洛阳电光设备研究所 | Adjusting method of off-axis four-reflector optical system |
| CN105242387A (en) * | 2015-10-26 | 2016-01-13 | 中国科学院西安光学精密机械研究所 | Large view field off-axis three-reflector system and adjusting method |
| CN109407263A (en) * | 2017-08-17 | 2019-03-01 | 北京遥感设备研究所 | A kind of high-precision Method of Adjustment for the off-axis collimated optical system that is all-trans |
| CN110737103A (en) * | 2019-10-31 | 2020-01-31 | 中国科学院长春光学精密机械与物理研究所 | large-caliber off-axis catadioptric multichannel optical system assembling and adjusting method |
| CN113917669A (en) * | 2021-09-08 | 2022-01-11 | 中国科学院西安光学精密机械研究所 | Off-axis reflection type telescopic system and installation and adjustment detection device and method thereof |
| CN115166932A (en) * | 2022-06-30 | 2022-10-11 | 北京空间机电研究所 | Optical axis adjusting method of large-caliber long-focus-distance axial optical system |
Non-Patent Citations (1)
| Title |
|---|
| 王智, 沙巍, 陈哲: "Preliminary design and analysis of telescope for space gravitational wave detection", 《中国光学》, vol. 11, no. 1, 28 February 2018 (2018-02-28) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116243497B (en) | 2024-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8115994B2 (en) | Scanning wide field telescope and method | |
| US9954613B1 (en) | Methods and devices for space optical communications using laser beams | |
| US10495839B1 (en) | Space lasercom optical bench | |
| US6922430B2 (en) | Method and apparatus for a multibeam beacon laser assembly for optical communications | |
| JP4976474B2 (en) | Optical transceiver for transmission direction control | |
| Knight et al. | Observatory alignment of the James Webb space telescope | |
| CN116243497B (en) | Off-axis four-reflection telescope for space laser interferometry and adjustment method | |
| Biswas et al. | Airborne optical communications demonstrator design and pre-flight test results | |
| Sychev et al. | Adaptation problems in the space telescope of the Millimetron observatory | |
| JP7092950B2 (en) | Injection of radiant beam into optical fiber | |
| Salinari | Large binocular telescope interferometer | |
| Takahashi et al. | Development of optical antennas utilizing free form surface optics for the high speed laser communication systems | |
| US6674571B2 (en) | Optical architecture for an observation telescope, in particular a telescope for observing the earth from a satellite | |
| Bely | The NGST'yardstick mission' | |
| Ireland et al. | Astrometric Interferometry | |
| Bunner | Optical arrays for future astronomical telescopes in space | |
| García-Talavera et al. | Design of a ground terminal for deep-space optical communications | |
| CN115980998B (en) | Design method of long exit pupil space gravitational wave telescope | |
| US11789252B1 (en) | Optical-inertial stabilization for electro-optical systems | |
| Lipinski et al. | Laser beaming demonstrations to high-orbit satellites | |
| Arimoto et al. | Simplified gimbal design for LEO satellites tracking to a GEO satellite | |
| Burge et al. | Optical design of giant telescopes for space | |
| Neff et al. | Agile beam director system design: ROBS/TCATS optical tracker | |
| Duncan et al. | Multiple-aperture telescope array with a high fill factor | |
| Jianjie et al. | Potential application of diffractive optical elements in satellite laser communication terminals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |