CN115826112B - Design method of prism for ultrafast solid laser - Google Patents
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Abstract
The invention discloses a design method of a prism for an ultrafast solid laser, which relates to the technical field of optical elements and aims to solve the following problems in the existing construction mode: the anti-damage threshold is limited by the film material and the film coating process, when the single pulse energy is too high, the service life of the reflecting film on the lens can be rapidly reduced or even the service condition can not be reached, and the film coating process of the reflecting film with a large angle is complex and has great difficulty. The prism for the ultrafast solid laser is isosceles trapezoid, L1 incident light is linearly polarized light, when the L1 incident light reaches the S1 surface, an included angle A between the L1 incident light and the normal line is an incident angle, L2 refracted light is generated after being refracted by the S1 surface, an included angle B between the L2 refracted light and the normal line 1 is an refraction angle, and an included angle C between the L2 refracted light and the normal line 2 is an incident angle when the L2 refracted light is transmitted to the S2 surface in a quartz glass medium.
Description
Technical Field
The invention relates to the technical field of optical elements, in particular to a design method of a prism for an ultrafast solid laser.
Background
Along with the continuous expansion of the application field of the ultrafast solid laser in recent years, the ultrafast solid laser is developed towards the direction of high power and high pulse energy, a laser crystal is used as one of core devices of the ultrafast solid laser, and the different modeling settings of the laser crystal can cause great difference in usage.
At present, almost all reflectors adopt a film plating method, mainly adopts a physical vapor deposition method (Physical Vapor Deposition), and is abbreviated as PVD. The PVD coating process is generally divided into three types, namely vacuum evaporation, sputter coating and ion plating. Vacuum evaporation is based on the principle that metal evaporates as it becomes a gas when heated in vacuum. The sputtering film is a phenomenon that molecules or atoms in a target are impacted when high-energy particles impact the target, and the principle is that the target is taken as a cathode, a substrate is taken as an anode, ar gas near the cathode is ionized to become Ar+ when high voltage is applied in Ar atmosphere of about 10 < -2 > Torr, the Ar+ impacts the cathode, and the molecules or atoms impacted by the Ar+ impact the substrate are impacted and accumulated to form a film. The best effect in the PVD coating process is an ion coating mode; the method is a technology that the arc is used to strike the target material, so that target material atoms are excited out to react with the reactive gas, and a compound is formed and deposited on the surface of a workpiece. After the furnace is operated to high vacuum, inert gas is introduced, bias voltage is applied to cause argon ions (Ar+) and negatively charged electrons (e-), and positively charged argon ions collide with a substrate which is introduced with a negative electrode, so that the surface of a workpiece is cleaned; then, a reaction gas is introduced to generate plasma between the target and the substrate, so as to perform a coating operation. The method has high film forming speed and better compactness, and is mostly used for the film coating treatment of the cutting tool.
The existing construction method has the following problems: the anti-damage threshold is limited by the film material and the film coating process, when the single pulse energy is too high, the service life of the reflecting film on the lens can be rapidly reduced or even the service condition can not be met, and the film coating process of the reflecting film with a large angle is complex and has high difficulty; for this purpose, we provide a design method of prism for ultrafast solid laser.
Disclosure of Invention
The invention aims to provide a design method of a prism for an ultrafast solid laser, which aims to solve the problems of the prior construction method proposed in the background art that: the anti-damage threshold is limited by the film material and the film coating process, when the single pulse energy is too high, the service life of the reflecting film on the lens can be rapidly reduced or even the service condition can not be reached, and the film coating process of the reflecting film with a large angle is complex and has great difficulty.
In order to achieve the above purpose, the present invention provides the following technical solutions: a design method of a prism for an ultrafast solid laser comprises the following steps:
step one: the prism for the ultrafast solid laser is isosceles trapezoid, L1 incident light is linearly polarized light, when the L1 incident light is incident on an S1 surface, an included angle A between the L1 incident light and a normal line 1 is an incident angle, L2 refracted light is generated after being refracted on the S1 surface, an included angle B between the L2 refracted light and the normal line 1 is an refraction angle, when the L2 refracted light is transmitted to the S2 surface in a quartz glass medium, an included angle C between the L2 refracted light and the normal line 2 is an incident angle, L3 reflected light is generated after being reflected on the S2 surface, an included angle E between the L3 reflected light and the normal line 3 is an incident angle, L4 emergent light is generated after being refracted on the S3 surface, an included angle F between the L4 emergent light and the normal line 3 is an refraction angle G, a refractive index of the light in the quartz glass medium is n, and when the L1 incident light is incident on the S2 surface at a Brewster angle:
∠A+∠B=90°
sin∠A=nsin∠B;
step two: calculating the angle A=arctan (n) according to the calculation formula in the first step; when 90 degrees is more than or equal to < C > is more than or equal to arcsin (1/n), total reflection occurs on the S2 plane for L2 refraction light, at the moment, < C > and < D > meet the law of reflection, and < C = < D = < A +< G-90 degrees, < E > and +< F meet the law of refraction, so that +.E=90 ° - < A= < B is calculated, and +.F= < A=arctan (n) is obtained through the light path reversibility, namely +.E is also the brewster angle, so that when the condition +.A=arctan (n) and the condition +.A+.G-90 degrees are more than or equal to arcsin (1/n) are met, the light path can be folded;
step three: the included angle between the L1 incident light and the L4 emergent light is +.H, then +.C+D=90-0.5 +.H- & lt A +.B, the calculated angle G=135-0.25 +.H-2 arctan (n), because of the condition limitation of +.C, the angle H has relative size limitation, but the range of the deflection angle of the light path is also large enough, the proper incident surface size and total reflection surface size can be designed according to the requirement of the prism size, namely, the prism suitable for the system light path can be designed, and the prism is an isosceles trapezoid and can be processed in the operation processing main body;
wherein an upper operation cover is arranged above the operation processing main body, the upper operation cover is rotationally and overturned and connected with the operation processing main body through a damping rotating shaft body, a front observation window is arranged in the front end face of the operation processing main body and is fixedly connected with the inner part of the front end face of the operation processing main body, a power line is arranged on one side of the operation processing main body, a first inner cavity is arranged in the operation processing main body, first telescopic rods are arranged on two sides of the inner wall of the first inner cavity, two telescopic rods are arranged, one ends of the first telescopic rods are hydraulically and telescopically connected with the operation processing main body, a fixed disc is arranged at the other end of the first telescopic rods, a sucking disc is arranged on one side of the fixed disc, one side of the sucker is connected with the fixed disc in a hot melting way, a second inner cavity is formed in the upper operation cover, first moving rods are arranged on two sides of the inner part of the second inner cavity, two first moving rods are arranged, two ends of each first moving rod are connected with the upper operation cover in a front-back moving way through a first electric shaft, four first electric shafts are arranged, the front end faces of the two second moving rods are provided with connecting blocks, the connecting blocks are connected with the second moving rods in a front-back moving way through a third electric shaft, the third electric shafts are provided with two connecting blocks, the front end faces of the connecting blocks are provided with fixed rods, the front end faces of the fixed rods are provided with operation motors, and polishing sheets are arranged on the front end faces of the operation motors and are connected with the operation motors in a high-speed rotating way;
the specific processing steps of the operation processing main body are as follows:
s101, placing the bottom of a lens between two suckers, enabling the two suckers to clamp the lens from two sides respectively by the first telescopic rod, installing a pressure sensor in the suckers, stopping using the first telescopic rod when the pressure value sensed by the pressure sensor exceeds a safety pressure threshold value born by the lens, completing clamping and fixing of the lens to be designed, and covering an operation cover;
s102, taking the bottom midpoint of the lens to be designed as a zero pointConstructing a coordinate system->The distances from the axis point to the four corners of the lens are the same, and the distance is +.>Base angle degree G of lens and lens height +.>Calculating the length of the upper surface of the lens required to be obtained after polishing>,/>The calculation formula of (2) is as follows:the controller controls the polishing sheet and the operation motor to move along the Z axis firstly, so that the polishing sheet and the operation motor move to the same height as the upper surface of the lens, the controller controls the operation motor to work and drive the polishing sheet to rotate, then the second moving rod and the connecting block act to enable the two polishing sheets to move in opposite directions, and the two polishing sheets are moved to the relative distance +.>Polishing two sides of the upper end of the lens;
s103, enabling the polishing sheet to slide downwards along the side face of the lens, polishing the side face of the lens, and setting the sliding speed of the polishing sheet and the operating motor on the second moving rod as followsAnd->Wherein/>For the movement time, the required movement speed of the first movement lever on the first electric axis is +.>,/>Therefore, it isThe calculation formula of (2) is as follows: />The controller is according to->And->And (3) controlling the transverse and longitudinal moving speeds of the polishing sheet to uniformly polish the side surface of the lens.
Preferably, the upper operating cover inner element is electrically connected with the operating processing main body.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has the advantages that the design principle of the prism is simple and clear, the application range is wide, and different prisms can be designed for different light path turning angles to realize; the symmetrical structure design of the lens also has the advantages of simple and easy installation and adjustment of the actual light path, and the like, and can effectively solve the problem of turning over the pulse laser light path with large angle, large energy and high damage.
2. The invention can realize the symmetry of the incident light path and the emergent light path, and is convenient for the adjustment of the actual light path; and dielectric film plating is not needed, so that the damage resistance threshold of the lens is improved.
3. The invention has wide application range, and can realize the turning angles of different light paths by adjusting the incident angle and the base angle of the prism aiming at the light paths of different wave bands.
Drawings
FIG. 1 is a schematic view of the overall structure of the crystal processing of the present invention;
FIG. 2 is a schematic view of the internal structure of the processing body according to the present invention;
FIG. 3 is a schematic view showing the internal structure of the upper operating cover of the present invention;
FIG. 4 is an enlarged schematic view of the structure of the portion A of the present invention;
FIG. 5 is a top view of a prism crystal body of the present invention;
in the figure: 1. operating the processing main body; 101. a front viewing window; 102. a power line; 103. a first inner cavity; 104. a first telescopic rod; 105. a fixed plate; 106. a suction cup; 2. an upper operation cover; 201. a second inner cavity; 202. a first electric shaft; 203. a first moving lever; 204. a second moving lever; 205. a connecting block; 206. a second electric shaft; 207. a third electric axis; 208. a fixed rod; 209. operating the motor; 210. polishing the sheet; 3. damping rotation shaft body.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Example 1
Referring to fig. 1-5, an embodiment of the present invention is provided: a design method of a prism for an ultrafast solid laser comprises the following steps:
step one: the prism for the ultrafast solid laser is isosceles trapezoid, L1 incident light is linearly polarized light, when the L1 incident light is incident on an S1 surface, an included angle A between the L1 incident light and a normal line 1 is an incident angle, L2 refracted light is generated after being refracted on the S1 surface, an included angle B between the L2 refracted light and the normal line 1 is an refraction angle, when the L2 refracted light is transmitted to the S2 surface in a quartz glass medium, an included angle C between the L2 refracted light and the normal line 2 is an incident angle, L3 reflected light is generated after being reflected on the S2 surface, an included angle E between the L3 reflected light and the normal line 3 is an incident angle, L4 emergent light is generated after being refracted on the S3 surface, an included angle F between the L4 emergent light and the normal line 3 is an refraction angle G, a refractive index of the light in the quartz glass medium is n, and when the L1 incident light is incident on the S2 surface at a Brewster angle:
∠A+∠B=90°
sin∠A=nsin∠B;
step two: calculating the angle A=arctan (n) according to the calculation formula in the first step; when 90 degrees is more than or equal to < C > is more than or equal to arcsin (1/n), total reflection occurs on the S2 plane for L2 refraction light, at the moment, < C > and < D > meet the law of reflection, and < C = < D = < A +< G-90 degrees, < E > and +< F meet the law of refraction, so that +.E=90 ° - < A= < B is calculated, and +.F= < A=arctan (n) is obtained through the light path reversibility, namely +.E is also the brewster angle, so that when the condition +.A=arctan (n) and the condition +.A+.G-90 degrees are more than or equal to arcsin (1/n) are met, the light path can be folded;
step three: the included angle between the L1 incident light and the L4 emergent light is +.H, then +.C+D=90-0.5 +.H- & lt A +.B, the calculated angle G=135-0.25 +.H-2 arctan (n), because of the condition limitation of +.C, the angle H has relative size limitation, but the range of the deflection angle of the light path is also large enough, the proper incident surface size and total reflection surface size can be designed according to the requirement of the prism size, namely, the prism suitable for the system light path can be designed, and the prism is an isosceles trapezoid and can be processed in the operation processing main body;
the upper operation cover 2 is arranged above the operation processing main body 1, the upper operation cover 2 is rotationally and overturned to be connected with the operation processing main body 1 through the damping rotating shaft body 3, a front observation window 101 is arranged in the front end face of the operation processing main body 1, the front observation window 101 is embedded and fixedly connected with the inside of the front end face of the operation processing main body 1, a power wire 102 is arranged on one side of the operation processing main body 1, a second inner cavity 201 is arranged in the upper operation cover 2, first movable rods 203 are arranged on two sides of the inside of the second inner cavity 201, the first movable rods 203 are arranged in two, two ends of the two first movable rods 203 are respectively connected with the upper operation cover 2 in a front-back moving way through first electric shafts 202, the first electric shafts 202 are arranged in four ways, the front end faces of the two second movable rods 204 are respectively provided with a connecting block 205, the connecting block 205 are respectively connected with the second movable rods 204 in a up-down moving way through third electric shafts 207, the front end faces of the connecting blocks 205 are provided with a fixed rod 208, the front end faces of the fixed rod 208 are respectively provided with an operation motor 209, the front end faces of the operation motor 209 are respectively provided with a polishing piece 210, and the polishing piece is connected with the polishing piece 209 in a high speed;
the specific processing steps of the operation processing main body 1 for processing the side surface of the lens are as follows:
s101, placing the bottom of a lens between two suckers 106, enabling the two suckers to clamp the lens from two sides respectively by the first telescopic rod 104, installing a pressure sensor in the suckers, stopping using the first telescopic rod 104 when the pressure value sensed by the pressure sensor exceeds a safety pressure threshold value bearable by the lens, completing clamping and fixing of the lens to be designed, and covering an operation cover 2;
s102, taking the bottom midpoint of the lens to be designed as a zero pointConstructing a coordinate system->The distances from the axis point to the four corners of the lens are the same, and the distance is +.>Base angle degree G of lens and lens height +.>Calculating the length of the upper surface of the lens required to be obtained after polishing>,/>The calculation formula of (2) is as follows:the controller controls the polishing sheet 210 and the operation motor 209 to move along the Z axis first, so that the polishing sheet 210 and the operation motor 209 move to the same height as the upper surface of the lens, the controller controls the operation motor 209 to work so as to drive the polishing sheet 210 to rotate, and then the second moving rod 204 and the connecting block 205 act to enable the two polishing sheets 210 to move in opposite directions, so that the two polishing sheets 210 move to a relative distance of +.>Polishing two sides of the upper end of the lens;
s103, enabling the polishing sheet 210 to slide downwards along the side surface of the lens, polishing the side surface of the lens, and setting the speed of the polishing sheet 210 and the operating motor 209 sliding up and down on the second moving rod 204 to beAnd->Wherein->For the movement time, the required movement speed of the first movement bar 203 on the first electric axis 202 is +.>,Therefore->The calculation formula of (2) is as follows: />The controller is according to->And->Proportional relation of (2)The lateral and longitudinal movement speed of the polishing sheet 210 is controlled to uniformly polish the side surface of the lens.
The prism to be processed can be placed in the processing main body 1, the two first telescopic rods 104 extend out to drive the suckers 106 to clamp objects, and the first moving rod 203, the second moving rod 204 and the connecting block 205 inside the upper operation cover 2 are rotated by the first electric shaft 202, the second electric shaft and the third electric shaft 207 to drive the operation motor 209 to realize processing change in the three-dimensional direction, so that all surfaces of the prism can be processed and operated.
The design method of the prism has simple and clear principle and wide application range, and can be realized by designing different prisms according to different light path turning angles; the symmetrical structure design of the lens also has the advantages of simple and easy installation and adjustment of the actual light path, and the like, and can effectively solve the problem of turning over the pulse laser light path with large angle, large energy and high damage.
Example 2
Referring to fig. 1, the internal components of the upper operating cover 2 are electrically connected to the operating main body 1.
In the embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented by other methods. The above-described apparatus embodiments are merely illustrative, for example, the division of units is merely a logical function division, and there may be another division method in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
Finally, it should be noted that: the above embodiments are merely illustrative of the embodiments of the present invention, and not limiting, and it will be appreciated by those skilled in the art that the present invention is not limited thereto, and that the present invention has been described in detail with reference to the foregoing embodiments: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (2)
1. The design method of the prism for the ultrafast solid laser is characterized by comprising the following steps of:
step one: the prism for the ultrafast solid laser is isosceles trapezoid, L1 incident light is linearly polarized light, when the L1 incident light is incident on an S1 surface, an included angle A between the L1 incident light and a normal line 1 is an incident angle, L2 refracted light is generated after being refracted on the S1 surface, an included angle B between the L2 refracted light and the normal line 1 is an refraction angle, when the L2 refracted light is transmitted to the S2 surface in a quartz glass medium, an included angle C between the L2 refracted light and the normal line 2 is an incident angle, L3 reflected light is generated after being reflected on the S2 surface, an included angle E between the L3 reflected light and the normal line 3 is an incident angle, L4 emergent light is generated after being refracted on the S3 surface, an included angle F between the L4 emergent light and the normal line 3 is an refraction angle G, a refractive index of the light in the quartz glass medium is n, and when the L1 incident light is incident on the S2 surface at a Brewster angle:
∠A+∠B=90°
sin∠A=nsin∠B;
step two: calculating the angle A=arctan (n) according to the calculation formula in the first step; when 90 degrees is more than or equal to < C > is more than or equal to arcsin (1/n), total reflection occurs on the S2 plane for L2 refraction light, at the moment, < C > and < D > meet the law of reflection, and < C = < D = < A +< G-90 degrees, < E > and +< F meet the law of refraction, so that +.E=90 ° - < A= < B is calculated, and +.F= < A=arctan (n) is obtained through the light path reversibility, namely +.E is also the brewster angle, so that when the condition +.A=arctan (n) and the condition +.A+.G-90 degrees are more than or equal to arcsin (1/n) are met, the light path can be folded;
step three: the included angle between the L1 incident light and the L4 emergent light is +.H, then +.C+ < D=90-0.5 +.H- < A +.B, the calculated angle G=135-0.25 +.H-2 arctan (n), because of the condition limitation of +.C, the angle H has relative size limitation, but the range of the deflection angle of the light path is also large enough, the proper incident surface size and total reflection surface size can be designed according to the requirement of the prism size, namely, the prism suitable for the system light path can be designed, and the prism is an isosceles trapezoid and can be processed in the operation processing main body (1);
wherein an upper operation cover (2) is arranged above the operation processing main body (1), the upper operation cover (2) is rotationally and overturned to be connected with the operation processing main body (1) through a damping rotating shaft body (3), a front observation window (101) is arranged inside the front end face of the operation processing main body (1), the front observation window (101) is embedded and fixedly connected with the inside of the front end face of the operation processing main body (1), a power wire (102) is arranged on one side of the operation processing main body (1), a first inner cavity (103) is arranged inside the operation processing main body (1), first telescopic rods (104) are arranged on two sides of the inner wall of the first inner cavity (103), two first telescopic rods (104) are arranged, one ends of the two first telescopic rods (104) are hydraulically and telescopically connected with the operation processing main body (1), a fixed disc (105) is arranged at the other end of the two first telescopic rods (104), a sucker (106) is arranged on one side of the fixed disc (105), a first inner cavity (203) is arranged on one side of the sucker (106) and is connected with the fixed disc (105), a second inner cavity (203) is arranged inside the first inner cavity (201) in the first inner cavity (2), the two ends of the first moving rods (203) are connected with the upper operation cover (2) in a front-back moving way through first electric shafts (202), the first electric shafts (202) are four, one side of each first moving rod (203) is provided with a second moving rod (204), each second moving rod (204) is two, each second moving rod (204) is connected with the first moving rod (203) in a left-right moving way through a second electric shaft (206), each second electric shaft (206) is two, the front end faces of each second moving rod (204) are provided with connecting blocks (205), each connecting block (205) is connected with the corresponding second moving rod (204) in an up-down moving way through a third electric shaft (207), the front end faces of the connecting blocks (205) are provided with fixing rods (208), the front end faces of the fixing rods (208) are provided with operation motors (209), and the front end faces of the operation motors (209) are provided with polishing sheets (210) and are connected with the polishing sheets (209) in a rotating way;
the specific processing steps of the operation processing main body (1) for processing the side surface of the lens are as follows:
s101, placing the bottom of a lens between two suckers (106), enabling the two suckers (106) to clamp the lens from two sides respectively by a first telescopic rod (104), installing a pressure sensor in the suckers (106), stopping using the first telescopic rod (104) when the pressure value sensed by the pressure sensor exceeds a safe pressure threshold value which can be born by the lens, finishing clamping and fixing the lens to be designed, and covering an operation cover (2);
s102, taking the bottom midpoint of the lens to be designed as a zero pointConstructing a coordinate system->The distances from the axis point to the four corners of the lens are the same, and the distance is +.>Base angle degree G of lens and lens height +.>Calculating the length of the upper surface of the lens required to be obtained after polishing>,/>The calculation formula of (2) is as follows:the controller controls the polishing sheet (210) and the operation motor (209) to move along the Z axis firstly, so that the polishing sheet (210) and the operation motor (209) move to the same height as the upper surface of the lens, the controller controls the operation motor (209) to work, drives the polishing sheet (210) to rotate, then the second moving rod (204) and the connecting block (205) act to enable the two polishing sheets (210) to move in opposite directions, and the two polishing sheets (210) are moved to the position with the relative distance of less than the lower limit>Polishing two sides of the upper end of the lens;
s103, enabling the polishing sheet (210) to slide downwards along the side surface of the lens, polishing the side surface of the lens, and setting the speed of the polishing sheet (210) and the operating motor (209) sliding up and down on the second moving rod (204) as followsAnd->WhereinFor the movement time, the required movement speed of the first movement lever (203) on the first electric axis (202) is +.>,Therefore->The calculation formula of (2) is as follows: />The controller is according to->And->And the lateral surface of the lens is uniformly polished by controlling the moving speed of the polishing sheet (210) in the transverse direction and the longitudinal direction.
2. The method for designing a prism for an ultrafast solid laser, as recited in claim 1, wherein: the inner element of the upper operation cover (2) is electrically connected with the operation processing main body (1).
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JPH0694905A (en) * | 1992-09-11 | 1994-04-08 | Nikon Corp | Erecting inclination type prism optical system |
JP2007012981A (en) * | 2005-07-01 | 2007-01-18 | National Institute Of Information & Communication Technology | Laser with high reflective coating on interior total reflection surface of optical element |
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CN109061783A (en) * | 2015-12-01 | 2018-12-21 | 苏州谱道光电科技有限公司 | Optical resonator reflecting prism and its optical resonator and optical spectrum instrumentation |
CN106112977B (en) * | 2016-07-21 | 2018-09-25 | 华中科技大学无锡研究院 | A kind of submissive polishing Serial-Parallel Type robot technique platform of curved surface class workpiece |
CN110618480B (en) * | 2019-09-26 | 2021-04-13 | 上海科乃特激光科技有限公司 | 90-degree deflection optical element, and use method and application thereof |
CN213570159U (en) * | 2020-11-04 | 2021-06-29 | 福州荣德光电科技有限公司 | Prism processingequipment with protection machanism |
CN213498173U (en) * | 2020-11-20 | 2021-06-22 | 昆山市健侑科技有限公司 | Adjustable polishing assembly |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH0694905A (en) * | 1992-09-11 | 1994-04-08 | Nikon Corp | Erecting inclination type prism optical system |
JP2007012981A (en) * | 2005-07-01 | 2007-01-18 | National Institute Of Information & Communication Technology | Laser with high reflective coating on interior total reflection surface of optical element |
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