CN118112778A - Laser emission system, adjustment method and laser ranging telescope - Google Patents

Laser emission system, adjustment method and laser ranging telescope Download PDF

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Publication number
CN118112778A
CN118112778A CN202410395556.9A CN202410395556A CN118112778A CN 118112778 A CN118112778 A CN 118112778A CN 202410395556 A CN202410395556 A CN 202410395556A CN 118112778 A CN118112778 A CN 118112778A
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CN
China
Prior art keywords
laser
beam expander
emission system
caliber
laser emission
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CN202410395556.9A
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Chinese (zh)
Inventor
姜晰文
李洪文
赵勇志
吕天宇
周超
王文攀
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Changchun Institute of Optics Fine Mechanics and Physics of CAS
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Priority to CN202410395556.9A priority Critical patent/CN118112778A/en
Publication of CN118112778A publication Critical patent/CN118112778A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/484—Transmitters
    • 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
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Astronomy & Astrophysics (AREA)
  • Lenses (AREA)

Abstract

The invention relates to the technical field of laser, in particular to a laser emission system, an adjustment method and a laser ranging telescope, wherein the laser emission system comprises a laser, a primary beam expander, a kude optical path and a secondary beam expander; the laser emits emergent laser, and the emergent laser sequentially passes through a primary beam expander, a kude light path and a secondary beam expander; the kude light path is used as a light guide light path; the beam expansion multiple of the secondary beam expander is larger than that of the primary beam expander; the laser ranging telescope comprises the laser emission system and an adjustment method are also provided; the structure of the laser emission system provided by the invention can solve the problems of high threshold value of damage of the optical element coating film caused by strong laser energy and high beam expansion ratio, and the problems of overlarge aperture and overlarge cost of the optical element in the optical path; the method for adjusting the laser emission system is simple, effective and feasible.

Description

Laser emission system, adjustment method and laser ranging telescope
Technical Field
The invention relates to the technical field of laser, in particular to a laser emission system applied to a laser ranging telescope, an adjustment method of the laser emission system in the laser ranging telescope and the laser ranging telescope comprising the laser emission system.
Background
In a laser ranging telescope, a laser emission system is generally composed of a laser, a beam expander, a kude optical path and the like. The laser emitted by the laser enters a subsequent light path after being expanded by the beam expander, and the direction and pitching rotation axis of the telescope are parallel to the main caliber optical axis of the telescope in the laser propagation process through the Coulter light path.
The laser emitted by the laser has larger beam divergence angle and poorer collimation degree, and cannot meet the requirement of long-distance measurement, so when the laser energy of the distance measurement telescope, the responsivity of the detector and the transceiving efficiency of the optical system are fixed, the beam divergence angle must be furthest reduced and the collimation degree of the laser must be improved in order to realize the ideal long-distance measurement effect. Because the laser beam divergence angle and the beam expansion ratio of the beam expander are inversely related, the beam expansion ratio of the laser emission system is usually larger, often more than 15 times, and even higher.
In the existing laser emission system patents, for example, the Chinese patent publication number is CN115754978A, the publication date is 2023, 03 and 07, the patent names are the patent application based on the optical axis parallel adjustment method of the laser emission system and the telescope receiving system and the Chinese patent publication number is CN115032806A, the publication date is 2022, 09 and 09, the patent names are the patent application of the multi-wavelength laser beam expanding method and the beam expanding system, only the beam expanding collimation of laser is simply described through a beam expander, or design parameters of a plurality of beam expanders are introduced, and the practical application scene of a laser ranging telescope is not combined, so that the problems existing after laser beam expansion in the laser emission system are deeply discussed and solved.
In the prior art, in order to achieve the goal of long-distance ranging, a high-power and high-energy laser is generally selected, so that the problem of laser damage of an optical element has to be considered in a laser emission system, and the coating film of the optical element must have a sufficient laser damage threshold. According to two different positions of the beam expander in the laser emission system, the existing problems are respectively unfolded.
When the beam expander is close to the laser, laser emitted by the laser directly enters the beam expander to finish beam expansion, and the requirement on the coating damage threshold of the surface of the beam expander is higher at the moment because the beam expansion is larger, and the requirement on the coating of the subsequent optical element is relatively reduced. But the caliber of each optical element in the subsequent optical path and the optical path of the telescope is greatly increased, and the requirement on structural space is greatly increased, and meanwhile, the cost is greatly increased.
When the beam expander is far away from the laser, laser emitted by the laser can firstly pass through the follow-up optical path optical element and the upper optical path of the telescope, and as the laser is not expanded, the light spot size is small, the energy in unit area can be very high, and in order to avoid the damage of the optical element, the extremely high requirement on optical coating is required, the difficulty is greatly improved, the feasibility of the system is greatly reduced, and even if the damage threshold meets the requirement, the cost can be greatly improved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a structure of a laser emission system applied to a laser ranging telescope, and the laser emission system provided by the invention can solve the problems of high threshold of damage of an optical element coating film and overlarge caliber and overlarge cost of the optical element in an optical path caused by strong laser energy and high beam expansion ratio; the invention also provides an assembling and adjusting method of the laser transmitting system in the laser ranging telescope, which is simple, effective and practical.
The invention provides a laser emission system, which comprises a laser, a primary beam expander, a kude light path and a secondary beam expander, wherein the primary beam expander is arranged on the laser;
the laser emits emergent laser which sequentially passes through the primary beam expander, the kude light path and the secondary beam expander; the kude light path is used as a light guide light path;
the beam expansion multiple of the secondary beam expander is larger than that of the primary beam expander.
Preferably, the beam expansion multiple of the primary beam expander is three to five times, and the beam expansion multiple of the secondary beam expander is more than five times.
Preferably, the laser emission system achieves more than 15 times of laser beam expansion.
Preferably, the primary beam expander comprises a first positive lens and a first negative lens, and the secondary beam expander comprises a second positive lens and a second negative lens;
The caliber of the second positive lens is larger than that of the first positive lens, the caliber of the first negative lens and the caliber of the second negative lens.
Preferably, the kude optical path comprises a plurality of plane mirrors;
The laser emission system comprises a first adjusting mechanism and a second adjusting mechanism, wherein the first adjusting mechanism is used for adjusting the azimuth and the pitching angle of the primary beam expander; the second adjusting mechanism is used for adjusting the azimuth and the pitching angle of the plane reflecting mirror; the first adjusting mechanism is used for adjusting the azimuth and the pitching angle of the secondary beam expander.
The invention also provides a laser ranging telescope which comprises the laser emission system.
The invention also provides a method for installing and adjusting the laser emission system, wherein the laser emission system is the laser emission system provided by the invention, and the method for installing and adjusting the laser emission system is used for installing the laser emission system in the laser ranging telescope;
the adjustment method comprises the following steps:
S1: the primary beam expander comprises a first negative lens and a first positive lens, the first negative lens and the first positive lens are arranged in an integral lens barrel, and the lens barrel is arranged on the first adjusting mechanism;
S2: setting the Cook light path according to the diameter of the light spot after the primary beam expander expands, wherein the Cook light path comprises a plane reflector which is arranged on the second adjusting mechanism;
s3: the second-stage beam expander comprises a second negative lens and a second positive lens, the second negative lens and the second positive lens are arranged in the integral lens barrel, and the second-stage optical axis of the second-stage beam expander is parallel to the main caliber optical axis of the laser ranging telescope through adjustment of the first adjusting mechanism;
S4: opening the laser, emitting emergent laser, and adjusting the two-dimensional angle of a plane reflecting mirror in the Cook light path so that the emergent laser is parallel to a main caliber optical axis of the laser ranging telescope in the propagation process;
S5: the primary beam expander is inserted into the light path along the direction perpendicular to the optical axis of the main aperture, and the primary optical axis of the primary beam expander is parallel to the optical axis of the emergent laser through the first adjusting mechanism.
Preferably, the single pulse energy of the emergent laser is 2J, the wavelength of the emergent laser is 1064nm, and the emergent diameter of the emergent laser is 15mm.
Preferably, the caliber range of the first negative lens is 70 mm-100 mm; the caliber range of the first positive lens is 70-mm-100 mm, and the caliber range of the second negative lens is 70-100 mm; the caliber range of the second positive lens is more than 225 mm; the caliber range of the plane reflecting mirror is 70 mm-100 mm.
Preferably, the threshold of damage of the plating film of the primary beam expander reaches 5J/cm 2.
Compared with the prior art, the invention has the following beneficial effects:
The laser emission system provided by the invention can solve the problems of high threshold value of damage of the optical element coating film, overlarge caliber of the optical element in the optical path and overlarge cost caused by strong laser energy and high beam expansion ratio; the invention also provides an assembling and adjusting method of the laser transmitting system in the laser ranging telescope, which is simple, effective and practical.
Drawings
Fig. 1 is a schematic diagram of a laser transmitting system applied to a laser ranging telescope according to an embodiment of the present invention.
Reference numerals:
1. A laser; 2. a first-stage beam expander; 3. a planar mirror; 4. azimuth rotating shaft of laser ranging telescope; 5. telescope pitching rotation shaft; 6. a secondary beam expander; 7. the main caliber optical axis of the laser ranging telescope; 8. the main caliber of the laser ranging telescope; 9. the optical axis of the laser emission system.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, like modules are denoted by like reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, a detailed description thereof will not be repeated.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention.
In a specific embodiment of the invention, the invention provides a laser emission system, which comprises a laser, a primary beam expander, a kude light path and a secondary beam expander; the laser emits emergent laser which sequentially passes through the primary beam expander, the kude light path and the secondary beam expander; the kude light path is used as a light guide light path; the beam expansion multiple of the secondary beam expander is larger than that of the primary beam expander; namely, the primary beam expander is a low-power beam expander, and the secondary beam expander is a high-power beam expander; in a specific embodiment, the beam expansion multiple of the primary beam expander is three to five times, and the beam expansion multiple of the secondary beam expander is more than five times; the laser emission system provided by the specific embodiment of the invention can realize laser beam expansion by more than 15 times.
In a specific embodiment, the primary beam expander comprises a first negative lens and a first positive lens, and the secondary beam expander comprises a second negative lens and a second positive lens; when the light spots pass through the primary beam expanding lens and the secondary beam expanding lens, the light spots pass through the negative lens and then pass through the positive lens, and the light spots are changed from small to large, so that the caliber of the secondary positive lens is maximum; namely, the caliber of the second positive lens is larger than the caliber of the first positive lens, the caliber of the first negative lens and the caliber of the second negative lens, wherein the caliber of the first negative lens is smaller than the caliber of the first positive lens and smaller than the caliber of the second negative lens; that is, only one lens with large caliber is needed, and the other three lenses can adopt small caliber; the kude optical path comprises a plurality of plane reflectors; specifically, the number may be any number.
In a specific embodiment, the laser emission system comprises a first adjusting mechanism and a second adjusting mechanism, wherein the first adjusting mechanism is used for adjusting the azimuth and the pitching angle of the primary beam expander; the second adjusting mechanism is used for adjusting the azimuth and the pitching angle of the plane reflecting mirror; the first adjusting mechanism is used for adjusting the azimuth and the pitching angle of the secondary beam expander.
In a specific embodiment, in the laser emission system provided by the invention, a low-power primary beam expander which is 3 to 5 times is arranged in the laser emission direction of the laser emission system near the laser end, and after laser emission, the primary beam expansion is performed through the beam expander, and the aperture of the beam expander is not required to be large because the size of a light spot emitted by the laser is not large and the beam expansion ratio of the beam expander is not large, so that the film plating of the primary beam expander has a higher damage threshold value, and the damage of a lens is avoided. The laser passing through the primary beam expander is continuously reflected and transmitted by the Coude light path, and particularly, the Coude light path provided by the invention is a light guide light path capable of turning a light beam to rotate along with a shaft system, and an outgoing laser beam can be prevented from being influenced by rotation of a rotary table through the Coude light path, so that the energy of a unit area of a laser spot is weakened after the light spot passes through beam expansion according to a preset direction, and therefore, the requirement on the coating damage threshold of a reflector in a subsequent light path is greatly reduced, and only one fifth to one third of the coating damage threshold of the reflector in the process of passing through the primary beam expander is needed; because of the reflection, the caliber of the laser spot is unchanged when the laser spot propagates after beam expansion, and therefore the caliber of the reflecting mirror can be controlled to be relatively smaller. A secondary beam expander which is more than 5 times away from the laser end is arranged on the laser emission system; in the laser emission system provided by the specific embodiment of the invention, the laser passing through the primary beam expander and the Cook light path reflector is emitted out through the secondary beam expander, so that the laser beam expansion of more than 15 times is realized.
The laser emission system provided by the specific embodiment of the invention successfully realizes more than 15 times of laser beam expansion by adopting the structural form of graded beam expansion. The structure changes the problem that the original optical path needs all optical elements to be coated with a film with high damage threshold into the problem that only a small-caliber primary beam expander needs to be coated with a film; the original problem of large caliber of all optical elements is converted into the problem that only one lens of the secondary beam expander is large in caliber in the light path, so that the space requirement degree and the difficulty and cost of the system are greatly reduced.
The invention further provides a laser ranging telescope, which comprises the laser transmitting system.
The invention also provides a method for installing and adjusting the laser emission system, wherein the laser emission system is the laser emission system provided by the invention, and the method for installing and adjusting the laser emission system is used for installing the laser emission system in the laser ranging telescope;
the adjustment method comprises the following steps:
S1: the primary beam expander comprises a first negative lens and a first positive lens, the first negative lens and the first positive lens are arranged in an integral lens barrel, and the lens barrel is arranged on the first adjusting mechanism;
S2: setting the Cook light path according to the diameter of the light spot after the primary beam expander expands, wherein the Cook light path comprises a plane reflector which is arranged on the second adjusting mechanism;
s3: the second-stage beam expander comprises a second negative lens and a second positive lens, the second negative lens and the second positive lens are arranged in the integral lens barrel, and the second-stage optical axis of the second-stage beam expander is parallel to the main caliber optical axis of the laser ranging telescope through adjustment of the first adjusting mechanism;
S4: opening the laser, emitting emergent laser, and adjusting the two-dimensional angle of a plane reflecting mirror in the Cook light path so that the emergent laser is parallel to a main caliber optical axis of the laser ranging telescope in the propagation process;
S5: the primary beam expander is inserted into the light path along the direction perpendicular to the optical axis of the main aperture, and the primary optical axis of the primary beam expander is parallel to the optical axis of the emergent laser through the first adjusting mechanism.
In a specific embodiment, the caliber of the beam expander is determined according to the diameter of a light spot of 15mm and the beam expansion ratio, the beam expansion of 15mm is 75mm after 5 times, and a allowance is left for processing the beam expander of 100mm; specifically, the single pulse energy of the emergent laser of the laser is 2J, the wavelength is 1064nm, and the emergent diameter of the emergent laser is 15mm; correspondingly, the caliber range of the first negative lens is 70 mm-100 mm; the caliber range of the first positive lens is 70 mm-100 mm, and the caliber range of the second negative lens is 70 mm-100 mm; the caliber range of the second positive lens is more than 225 mm; the caliber range of the plane reflecting mirror is 70 mm-100 mm; the coating damage threshold of the primary beam expander reaches 5J/cm 2.
In the specific embodiment of the invention, when the laser emission system is assembled and adjusted, the large-caliber secondary beam expander is firstly adjusted to be parallel to the main caliber optical axis of the telescope, then the laser is parallel to the azimuth and pitching rotating shafts of the telescope in the propagation process by adjusting the angle of the Kude optical path reflector, and is parallel to the main caliber optical axis of the telescope, after the adjustment is completed, the propagation direction of the light is perpendicular, the primary beam expander is inserted into the optical path, and the whole process is simple to operate.
The technical scheme provided by the invention changes the beam expander in the original laser emission system into a structure form of graded beam expansion, and is successfully applied to a laser ranging telescope; the laser light spot is subjected to primary beam expansion and amplification, so that the coating requirements of elements in a subsequent light path are greatly reduced, and the problem that the original light path needs high coating damage threshold of all optical elements is changed into the problem that only a small-caliber primary beam expander is required to be coated; the original problem of large caliber of all optical elements is converted into the problem that only one lens of the secondary beam expander is large in caliber in the light path, so that the space requirement degree and the difficulty and cost of the system are greatly reduced; meanwhile, the technical scheme provided by the invention provides a simple, reasonable and feasible adjustment method.
Further description will be provided below in connection with specific embodiments.
Example 1
As shown in fig. 1, a schematic structural diagram of a laser emission system applied to a laser ranging telescope according to the embodiment of the present invention is shown, and as can be seen from the figure, the laser emission system of the embodiment includes a laser 1, a primary beam expander 2, a plurality of plane mirrors 3 forming a kude optical path, and a secondary beam expander 6; in a long-distance laser ranging telescope system, the laser 1 is usually high in energy, and the spot of the emergent laser is assumed to be 15mm; the primary beam expander 2 consists of two lenses, is arranged in a lens cone, and has higher requirements on the damage threshold of the mirror surface coating; for example, taking the beam expansion ratio of the primary beam expander 2 as 3 times to 5 times as an example, the caliber of the primary beam expander 2 can be designed to be 100mm, and the primary beam expander 2 can be specifically composed of two lenses, namely a negative lens and a positive lens; specifically, the calculation of the damage threshold of the mirror surface coating of the primary beam expander 2 is to divide the laser energy value by the laser spot area, and on the basis of the calculation, the laser energy value is larger, a margin is reserved, the lens is guaranteed not to be damaged, 2J/0.75 x 3.14=1.13J/cm 2, and the margin can be reserved to be 5J/cm 2.
The application of the laser emission system in the meter-level laser ranging telescope is specifically introduced by combining the structural form and the adjustment method of the laser emission system:
Step one: taking laser monopulse energy 2J, wavelength 1064nm, light emitting diameter 15mm and beam expansion ratio 3 times of a primary beam expander 2 as an example, the caliber of the primary beam expander 2 can be processed to be 70mm, the coating damage threshold should reach 5J/cm 2, and the primary beam expander is specifically composed of two lenses, wherein a first negative lens and a first positive lens; the lens barrel is arranged in an integral lens barrel, and is arranged on a first adjusting mechanism with adjustable azimuth and pitching angle after the completion; the caliber of the primary beam expander 2 is determined according to the spot diameter of 15mm and the beam expansion ratio, the beam expansion of 15mm is 75mm after 5 times, and the primary beam expander 2 of 100mm can be processed with allowance.
Step two: according to the diameter of the light spot after the primary beam expander 2 expands the beam, selecting a plane mirror 3 with reasonable caliber and proper mirror surface coating damage threshold to be arranged in a kude light path, wherein the plane mirror 3 is arranged on an adjusting mechanism with azimuth and pitching two-dimensional angles; in different embodiments, the specific number and position settings of the planar mirrors 3 are different;
Step three: the secondary beam expander 6 with the beam expansion ratio being more than 5 times is designed, the secondary beam expander 6 consists of two lenses, including a second negative lens and a second positive lens, wherein one lens with a larger caliber exists, namely the second positive lens, the light spot of the outgoing laser of the laser 1 is 15mm, the light spot of the outgoing laser is calculated by more than 15 times of the twice beam expansion ratio, the light spot of the outgoing laser reaches more than 225mm when passing through the lens, and the two lenses are arranged in the integral lens cone.
Step four: when the adjustment is carried out, firstly, the interferometer and the like can be utilized to carry out parallel adjustment on the secondary beam expander 6 and the main caliber optical axis 7 of the laser ranging telescope, and the step can be specifically realized by adjusting the azimuth and the pitching angle of the integral lens barrel of the secondary beam expander 6 through adjusting a first adjusting mechanism;
Step five: opening the laser 1, and adjusting the two-dimensional angle of the plane reflecting mirror 3 in the Kude optical path to enable the outgoing laser to be parallel to the azimuth rotating shaft 4 of the laser ranging telescope and the pitching rotating shaft 5 of the laser ranging telescope and finally parallel to the main caliber optical axis 7 of the laser ranging telescope of the main caliber 8 of the laser ranging telescope in the propagation process;
step six: after the above steps are completed, the outgoing laser, the plane mirror 3 in the kude optical path and the secondary beam expander 6 are aligned, at this time, the component of the primary beam expander 2 needs to be inserted into the whole optical path along the direction perpendicular to the main caliber optical axis 7 of the laser ranging telescope at a proper position near the end of the laser 1, and fine adjustment is performed by using the first adjustment mechanism, so that the primary optical axis of the primary beam expander 2 is ensured to be parallel to the optical axis 9 of the laser emission system, and thus the whole adjustment is completed.
In other embodiments, the position and number of the plane mirrors 3 in the kude optical path may be determined according to the propagation direction of the outgoing light in the telescope, but no matter how the plane mirrors 3 are changed, the structural design of the laser emitting system of the present invention ensures that the outgoing light will pass through the azimuth axis 4 of the laser ranging telescope and the elevation axis 5 of the laser ranging telescope.
The structural scheme of the laser emission system provided by the invention is practically applied to a plurality of sets of meter-level caliber laser ranging telescope systems, and a series of problems of difficult film plating, large aperture, high cost and the like of an optical element in the original scheme are successfully solved; through the operation verification of the laser ranging telescope, the scheme is reliable, stable and feasible.
While embodiments of the present invention have been illustrated and described above, it will be appreciated that the above described embodiments are illustrative and should not be construed as limiting the invention. Variations, modifications, alternatives and variations of the above-described embodiments may be made by those of ordinary skill in the art within the scope of the present invention.
The above embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.

Claims (10)

1. The laser emission system is characterized by comprising a laser, a primary beam expander, a kude light path and a secondary beam expander;
the laser emits emergent laser which sequentially passes through the primary beam expander, the kude light path and the secondary beam expander; the kude light path is used as a light guide light path;
the beam expansion multiple of the secondary beam expander is larger than that of the primary beam expander.
2. The laser emitting system of claim 1, wherein the primary beam expander has a beam expansion factor of three to five times and the secondary beam expander has a beam expansion factor of more than five times.
3. The laser emitting system of claim 1, wherein the laser emitting system achieves more than fifteen times laser beam expansion.
4. The laser emission system of claim 1, wherein the primary beam expander comprises a first positive lens and a first negative lens, and the secondary beam expander comprises a second positive lens and a second negative lens;
The caliber of the second positive lens is larger than that of the first positive lens, the caliber of the first negative lens and the caliber of the second negative lens.
5. The laser light emitting system of claim 1, wherein the kude optical path comprises a plurality of planar mirrors;
The laser emission system comprises a first adjusting mechanism and a second adjusting mechanism, wherein the first adjusting mechanism is used for adjusting the azimuth and the pitching angle of the primary beam expander; the second adjusting mechanism is used for adjusting the azimuth and the pitching angle of the plane reflecting mirror; the first adjusting mechanism is used for adjusting the azimuth and the pitching angle of the secondary beam expander.
6. A laser ranging telescope, characterized in that it comprises the laser emission system according to any one of claims 1 to 5.
7. A method for installing and adjusting a laser emission system, which is characterized in that the laser emission system is the laser emission system according to any one of claims 1 to 5, and the method is used for installing the laser emission system in a laser ranging telescope;
the adjustment method comprises the following steps:
S1: the primary beam expander comprises a first negative lens and a first positive lens, the first negative lens and the first positive lens are arranged in an integral lens barrel, and the lens barrel is arranged on the first adjusting mechanism;
S2: setting the Cook light path according to the diameter of the light spot after the primary beam expander expands, wherein the Cook light path comprises a plane reflector which is arranged on the second adjusting mechanism;
s3: the second-stage beam expander comprises a second negative lens and a second positive lens, the second negative lens and the second positive lens are arranged in the integral lens barrel, and the second-stage optical axis of the second-stage beam expander is parallel to the main caliber optical axis of the laser ranging telescope through adjustment of the first adjusting mechanism;
S4: opening the laser, emitting emergent laser, and adjusting the two-dimensional angle of a plane reflecting mirror in the Cook light path so that the emergent laser is parallel to a main caliber optical axis of the laser ranging telescope in the propagation process;
S5: the primary beam expander is inserted into the light path along the direction perpendicular to the optical axis of the main aperture, and the primary optical axis of the primary beam expander is parallel to the optical axis of the emergent laser through the first adjusting mechanism.
8. The method for adjusting a laser emission system according to claim 7, wherein the single pulse energy of the outgoing laser beam is 2J, the wavelength of the outgoing laser beam is 1064nm, and the outgoing diameter of the outgoing laser beam is 15mm.
9. The method for adjusting a laser emission system according to claim 8, wherein the aperture of the first negative lens ranges from 70mm to 100mm; the caliber range of the first positive lens is 70-100 mm, and the caliber range of the second negative lens is 70-100 mm; the caliber range of the second positive lens is more than 225 mm; the caliber range of the plane reflecting mirror is 70 mm-100 mm.
10. The method for adjusting a laser emission system according to claim 9, wherein the threshold of damage of the coating film of the primary beam expander is 5J/cm 2.
CN202410395556.9A 2024-04-02 2024-04-02 Laser emission system, adjustment method and laser ranging telescope Pending CN118112778A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118276104A (en) * 2024-06-03 2024-07-02 中国科学院长春光学精密机械与物理研究所 Space debris scene-oriented dual-band laser ranging system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118276104A (en) * 2024-06-03 2024-07-02 中国科学院长春光学精密机械与物理研究所 Space debris scene-oriented dual-band laser ranging system and method

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