CN111399202A - Spatial light modulator coupling device without zero-order diffraction light - Google Patents
Spatial light modulator coupling device without zero-order diffraction light Download PDFInfo
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- CN111399202A CN111399202A CN202010396839.7A CN202010396839A CN111399202A CN 111399202 A CN111399202 A CN 111399202A CN 202010396839 A CN202010396839 A CN 202010396839A CN 111399202 A CN111399202 A CN 111399202A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—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
- G02B17/0668—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror having non-imaging properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
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Abstract
The invention belongs to the field of spatial light field regulation and control, and relates to a spatial light modulator coupling device without zero-order diffraction light, which comprises a sealing box, an asymmetric triangular reflector and a spatial light modulator; the asymmetric triangular reflector and the spatial light modulator are oppositely arranged and are arranged in the sealing box; the sealing box is provided with a light inlet hole and a light outlet hole; the incident light is emitted from the light outlet after sequentially passing through the light inlet, the asymmetric triangular reflector, the spatial light modulator and the asymmetric triangular reflector. The invention provides a spatial light modulator coupling device without zero-order diffraction light, which can regulate and control a high-precision light field, can inhibit zero-order light beams without a spatial filter, is modularized and compact and is easy to combine with other systems.
Description
Technical Field
The invention belongs to the field of spatial light field regulation and control, relates to a spatial light modulator coupling device, and particularly relates to a spatial light modulator coupling device without zero-order diffracted light.
Background
The invention of the laser in 1960 greatly promotes the development of natural scientific research, such as the laser life science, the optical information processing, the optical micro-nano processing and other fields of scientific research based on laser, the main limitation of the common commercial laser is that the output mode is fixed, generally a fundamental mode gaussian light beam, which cannot meet the requirements of modern scientific research and application on specific distribution of the amplitude, phase and polarization state of the light field, the Spatial light field regulation and control technology based on the Spatial light Modulator regulating and controlling the Spatial parameters of the light field converts the fundamental mode gaussian light beam into a novel optical field with any structure, which promotes the rapid development in the fields of optical information storage, optical micro-nano processing, optical communication, optical microscopy and optical micro-manipulation, the common light field regulation and control Device mainly comprises a Digital micro-Mirror Device (DMD), a Deformable Mirror (DM) and a liquid crystal Spatial light Modulator (Spatial light Modulator) (S L M), the liquid crystal Spatial light Modulator) is a common Spatial light field of the most applied Spatial light field, the Spatial light field of which is a light field of a liquid crystal, the incident light field, the Spatial light field, the incident light field is not only the incident angle, the phase, the incident angle, the Spatial light beam, the Spatial light intensity, the Spatial light beam, the Spatial light intensity, the Spatial light beam, the Spatial light.
Disclosure of Invention
In order to solve the problems of scattered system optical path and zero-order light beam filtering existing in the background technology, the invention provides a spatial light modulator coupling device which has high-precision light field regulation and control, can inhibit zero-order light beams without a spatial filter, is modularized and compact and is easy to combine with other systems and has no zero-order diffraction light.
In order to achieve the purpose, the invention adopts the following technical scheme:
a spatial light modulator coupling device free of zero order diffracted light, characterized by: the spatial light modulator coupling device without zero-order diffraction light comprises a sealed box, an asymmetric triangular reflector and a spatial light modulator; the asymmetric triangular reflector and the spatial light modulator are oppositely arranged and are arranged in the sealing box; the sealing box is provided with a light inlet hole and a light outlet hole; the incident light is emitted from the light outlet after sequentially passing through the light inlet, the asymmetric triangular reflector, the spatial light modulator and the asymmetric triangular reflector.
The position relation between the asymmetric triangular reflector and the spatial light modulator satisfies the following conditions: d2 is more than or equal to d 1;
wherein:
d1 is the vertical distance from the intersection point of the incident light to the spatial light modulator and the emergent light modulated by the spatial light modulator to the spatial light modulator;
d2 is the vertical distance from the vertex of the asymmetric triangular reflector to the spatial light modulator.
The relation between the apex angle α of the asymmetric triangular reflector and the exit angle β of the laser beam modulated by the spatial light modulator is α ═ 90 ° + β/2.
The asymmetric triangular reflector comprises a first reflecting waist surface and a second reflecting waist surface connected with the first reflecting waist surface; the incident light sequentially passes through the light inlet hole, the first reflecting waist surface, the spatial light modulator and the second reflecting waist surface and then is emitted from the light outlet hole; the vertex of the asymmetric triangular reflector is a connection point of the first reflecting surface and the second reflecting surface.
The included angle between the first reflecting waist surface and the axis of the seal box is 45 degrees, the included angle between the second reflecting waist surface and the axis of the seal box is gamma, and gamma is 45 degrees + β/2.
The vertex angle α of the asymmetric triangular reflector is 93-95 degrees, and the included angle gamma between the second reflecting waist surface and the axis of the sealing box is 48-50 degrees.
The first reflecting waist surface and the second reflecting waist surface are both plated with high-reflection films.
The light inlet hole and the light outlet hole are concentric.
The spatial light modulator coupling device without the zero-order diffraction light also comprises a threaded hole arranged on the sealing box.
The threaded holes are uniformly distributed in the circumferential direction of the light inlet hole and/or the circumferential direction of the light outlet hole by taking a connecting line of the light inlet hole and the light outlet hole as a center.
The invention has the advantages that:
the invention provides a spatial light modulator coupling device without zero-order diffraction light, which comprises a sealing box, an asymmetric triangular reflector and a spatial light modulator; the asymmetric triangular reflector and the spatial light modulator are oppositely arranged and are arranged in the sealing box; the sealing box is provided with a light inlet hole and a light outlet hole; the incident light is emitted from the light outlet after sequentially passing through the light inlet, the asymmetric triangular reflector, the spatial light modulator and the asymmetric triangular reflector. Light through holes through which incident light and emergent light pass are formed in two sides of the sealing box; the asymmetric triangular reflector is arranged on an incident light path and an emergent light path of the spatial light modulator and used for coupling incident light and emergent light, and the surfaces of two asymmetric surfaces of the asymmetric triangular reflector are plated with high-reflection films. The invention simultaneously realizes the vertical incidence of the laser beam and the small-angle emission of the modulated light beam, can inhibit the zero-order light beam without a spatial filter, and solves the problems of discrete components, unstable system, difficult zero-order light beam inhibition and the like commonly existing in the prior reflective spatial light field regulation system. On the premise of high-efficiency coupling of input and output laser beams, the interference of zero-order light beams is avoided, the occupied space of a space light field regulation and control light path is greatly compressed, the whole space light field regulation and control device is miniaturized and compacted, the volume and weight of the whole machine are greatly reduced, and the system is very favorable for modularization and instrumentation.
The invention utilizes the asymmetric triangular reflector to realize the small angle emission of a laser beam vertical incidence spatial light modulator and modulated light, utilizes the asymmetric triangular reflector to realize the suppression of zero-order light beams which are not modulated by the spatial light modulator, utilizes the asymmetric triangular reflector to guide and separate the incident light and the emergent light in the minimum distance, and utilizes the reflective spatial light field regulation module which is based on the coupled light beams of the asymmetric triangular reflector to have high light energy utilization rate and wide band applicability, thereby being suitable for light sources in the range from a visible light band to a middle infrared wavelength and greatly expanding the application range of the spatial light field regulation module.
Drawings
FIG. 1 is a schematic diagram of a normal incidence mode of spatial light modulator S L M in an optical system;
FIG. 2 is a schematic diagram of a small angle of incidence of spatial light modulator S L M in an optical system;
FIG. 3 is a schematic diagram of zero order light blocking scheme in a small angle incidence mode;
FIG. 4 is a schematic diagram of a spatial light modulator coupling device without zeroth order diffracted light according to the present invention;
FIG. 5 is a schematic diagram of a configuration in which multiple spatial light modulators are used in series;
FIG. 6 is a schematic structural diagram of a preferred embodiment of the spatial light modulator coupling device without zeroth order diffracted light provided by the present invention.
Reference numerals:
1-a spatial light modulator; 2-asymmetric triangular reflector; 3-sealing the box; 21-a first reflective waist surface; 22-a second reflective waist surface; 31-a light incident hole; 32-light exit hole.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 4, the present invention provides a spatial light modulator coupling device without zero-order diffracted light, which comprises a sealed box 3, an asymmetric triangular reflector 2 and a spatial light modulator 1; the asymmetric triangular reflector 2 and the spatial light modulator 1 are oppositely arranged and are arranged in the sealing box 3; the sealing box 3 is provided with a light inlet hole 31 and a light outlet hole 32; the incident light sequentially passes through the light inlet 31, the asymmetric triangular reflector 2, the spatial light modulator 1 and the asymmetric triangular reflector 2 and then exits from the light outlet 32.
The positional relationship between the asymmetric triangular reflector 2 and the spatial light modulator 1 satisfies: d2 is more than or equal to d 1;
wherein:
d1 is the vertical distance from the intersection point of the incident light incident on the spatial light modulator 1 and the outgoing light modulated by the spatial light modulator 1 to the spatial light modulator 1 (i.e. d1 is the vertical distance from the separation point of the two light beams to S L M when the incident light and the outgoing light are just separated);
d2 is the vertical distance from the apex of the asymmetric triangular reflector 2 to the spatial light modulator 1.
The relationship between the apex angle α of the asymmetric triangular reflector 2 and the exit angle β of the laser beam modulated by the spatial light modulator 1 is α ═ 90 ° + β/2.
The asymmetric triangular reflector 2 comprises a first reflecting waist surface 21 and a second reflecting waist surface 22 connected with the first reflecting waist surface 21; the incident light sequentially passes through the light inlet hole 31, the first reflection waist surface 21, the spatial light modulator 1 and the second reflection waist surface 22 and then is emitted from the light outlet hole 32; the vertex of the asymmetric triangular reflector 2 is a connection point of the first reflecting surface and the second reflecting surface.
The included angle between the first reflecting waist surface 21 and the axis of the seal box 3 is 45 degrees, the included angle between the second reflecting waist surface 22 and the axis of the seal box 3 is gamma which is 45 degrees + β/2, the vertex angle α of the asymmetric triangular reflector 2 is 93 degrees to 95 degrees, the included angle gamma between the second reflecting waist surface 22 and the axis of the seal box 3 is 48 degrees to 50 degrees, the first reflecting waist surface 21 and the second reflecting waist surface 22 are both plated with high-reflection films, and the light inlet hole 31 and the light outlet hole 32 are concentric.
The spatial light modulator coupling device without zero-order diffraction light further comprises threaded holes arranged on the sealing box, the threaded holes are uniformly distributed in the circumferential direction of the light inlet hole 31 and/or the circumferential direction of the light outlet hole 32 by taking a connecting line of the light inlet hole 31 and the light outlet hole 32 as a center, and the threaded holes can be conveniently butted with other optical components.
The two waist surfaces of the asymmetric triangular reflector 2 adopted by the invention are plated with high-reflection films, two sides of the sealing box 3 close to the two waist surfaces of the asymmetric triangular reflector 2 are respectively provided with light through holes as an input end and an output end of a whole space light field, namely a light inlet hole 31 and a light outlet hole 32 of the sealing box 3, and the light inlet hole 31 and the light outlet hole 32 are concentrically arranged; the positions and distances of the asymmetric triangular reflector 2 and the spatial light modulator 1 are adjusted and fixed in the sealing box 3, and the specific positions are set to be that two waist surfaces of the asymmetric triangular reflector 2 are arranged on an incident light path and an emergent light path of the spatial light modulator 1 and used for coupling incident light and emergent light.
The included angle between the first reflecting waist surface 21 and the horizontal line NN ' is 45 degrees, the angle of the laser beam perpendicular to the horizontal line NN ' irradiated on the spatial light modulator after being reflected by the first reflecting waist surface 21 is 0 degrees, namely, the laser beam is vertically incident, the included angle gamma between the second reflecting waist surface 22 and the horizontal line NN ' and the exit angle β of the laser beam after being modulated by the spatial light modulator satisfy the relation that gamma is 45 degrees + β/2, and the vertex angle α of the asymmetric triangular reflector 2 and the exit angle β of the laser beam after being modulated by the spatial light modulator satisfy the relation that α is 90 degrees + β/2.
The two asymmetric waist surfaces of the asymmetric triangular reflector 2 are silvered reflecting surfaces, incident light A is reflected by the first reflecting waist surface 21 and then vertically irradiates the spatial light modulator 1(S L M) to be modulated, modulated light irradiates the second reflecting waist surface 22 and is reflected, the geometric relation shows that if the incident light is incident perpendicular to the central line NN 'of the asymmetric triangular reflector 2 and the spatial light modulator 1, the laser beam is vertically incident on the liquid crystal panel of the spatial light modulator 1 after being reflected by the first reflecting waist surface 21, the laser beam modulated by the spatial light modulator loaded with the blazed grating phase hologram is emitted at a small angle β and finally reflected by the second reflecting waist surface 22, the finally obtained emergent light B is parallel to the incident light A, the zero-order light beam C which is not modulated due to the grid structure of the spatial light modulator returns to the first reflecting waist surface 21 along the original path and finally exits through the hole 31, the separation of the emergent light B is realized, the included angle gamma between the second reflecting waist surface 22 and the horizontal line NN' and the emergent angle gamma of the first reflecting waist surface 21, the emergent light is finally emitted through the hole 31, the emergent light C, the emergent angle of the asymmetric triangular reflector is equal to the vertex 3548, the vertex angle of the asymmetric triangular reflector 3, the emergent light-90 angle of the emergent light-90 compressed laser beam compression angle of the emergent light-3695-90-ideal angle-equivalent-to-equivalent-.
The vertex angle of the asymmetric triangular reflector 2 can be designed to be α degrees, then the incident angle of incident light irradiating the spatial light modulator S L M is 0 degrees, the laser beam emergence angle modulated by the spatial light modulator S L M is 6 degrees, if the spot diameter D of the incident light is 10mm, then the minimum distance for completely separating the incident light and the emergent light is D1 degrees, D/tan (β) is 8/tan (6 degrees), 95.1mm, considering the processing precision problem of the vertex angle of the asymmetric triangular reflector 2, the actual distance D2 from the asymmetric triangular reflector 2 to the S L M liquid crystal panel can be determined to be 100mm, the incident light and the emergent light are parallel, and the adjustment of a system light path and the continuous expansion of functions are greatly facilitated.
The asymmetric triangular reflector 2 and the spatial light modulator S L M are arranged in the seal box 3, so that a modularized compact spatial light field regulation and control device can be formed, the quality of the spatial light field regulation and control device is effectively reduced, the system quality is reduced, the transfer convenience of the device is improved, and the modularized device is beneficial to the instrumentization and commercialization of the system.
As shown in fig. 5, when the amplitude, phase and polarization state of the optical field need to be modulated simultaneously by connecting a plurality of spatial light modulators 1 in series, the present invention can simply and quickly connect a plurality of spatial light modulators 1 in series (the apparatus of the present invention (including the spatial light modulator 1) is connected in series by a relay system (for example, a 4f system, which is a common knowledge) in an optical system, thereby avoiding system redundancy and confusion caused by connecting a plurality of spatial light modulators 1 in series and avoiding system complexity caused by using a plurality of spatial filters.
As shown in FIG. 6, a P L UTO series spatial light modulator 1 and a 93 degree asymmetric triangular reflector 2 (bottom surface: 52.8mm × 25mm, height: 25mm) from HoloeYE, Germany are mounted in a small sealed box 3 (143mm × 76mm × 48mm), two SM1 threads with a clear hole size of 1.035 inch-40, and four 8 × 4-40UNC threaded holes centered on the clear hole, which can be conveniently interfaced with other optical components, such as a 30mm cage system, the box 3 can seal the whole device from dust, diffraction spots, etc.
Claims (10)
1. A spatial light modulator coupling device free of zero order diffracted light, characterized by: the spatial light modulator coupling device without zero-order diffraction light comprises a sealed box (3), an asymmetric triangular reflector (2) and a spatial light modulator (1); the asymmetric triangular reflector (2) and the spatial light modulator (1) are oppositely arranged and are arranged in the sealing box (3); the sealing box (3) is provided with a light inlet hole (31) and a light outlet hole (32); the incident light sequentially passes through the light inlet (31), the asymmetric triangular reflector (2), the spatial light modulator (1) and the asymmetric triangular reflector (2) and then is emitted from the light outlet (32).
2. The spatial light modulator coupling device without zero order diffracted light of claim 1, wherein: the position relation between the asymmetric triangular reflector (2) and the spatial light modulator (1) satisfies the following conditions: d2 is more than or equal to d 1;
wherein:
d1 is the vertical distance from the intersection point of the incident light entering the spatial light modulator (1) and the emergent light modulated by the spatial light modulator (1) to the spatial light modulator (1);
d2 is the vertical distance from the vertex of the asymmetric triangular reflector (2) to the spatial light modulator (1).
3. The device for coupling a spatial light modulator without zeroth order diffracted light according to claim 2, wherein the vertex angle α of the asymmetric triangular reflector (2) has a relation of α ═ 90 ° + β/2 with respect to the exit angle β of the laser beam modulated by the spatial light modulator (1).
4. A spatial light modulator coupling device without zero order diffracted light according to claim 3, wherein: the asymmetric triangular reflector (2) comprises a first reflecting waist surface (21) and a second reflecting waist surface (22) connected with the first reflecting waist surface (21); incident light sequentially passes through the light inlet hole (31), the first reflection waist surface (21), the spatial light modulator (1) and the second reflection waist surface (22) and then is emitted from the light outlet hole (32); the vertex of the asymmetric triangular reflector (2) is a connection point of the first reflecting surface and the second reflecting surface.
5. The spatial light modulator coupling device without zero-order diffracted light according to claim 4, wherein the angle between the first reflecting waist surface (21) and the axis of the capsule (3) is 45 °, the angle between the second reflecting waist surface (22) and the axis of the capsule (3) is γ, and γ is 45 ° + β/2.
6. The spatial light modulator coupling device without zero-order diffracted light of claim 5, wherein the vertex angle α of the asymmetric triangular reflector (2) is 93-95 °, and the included angle γ between the second reflecting waist surface (22) and the axis of the sealed box (3) is 48-50 °.
7. The device according to claim 6, wherein: the first reflection waist surface (21) and the second reflection waist surface (22) are both plated with high reflection films.
8. A spatial light modulator coupling means according to any one of claims 1 to 7 free of zero order diffracted light, wherein: the light inlet hole (31) and the light outlet hole (32) are concentric.
9. The device according to claim 8, wherein: the spatial light modulator coupling device without the zero-order diffraction light further comprises a threaded hole arranged on the sealing box.
10. The spatial light modulator coupling device without zero order diffracted light of claim 9, wherein: the threaded holes are uniformly distributed in the circumferential direction of the light inlet hole (31) and/or the circumferential direction of the light outlet hole (32) by taking a connecting line of the light inlet hole (31) and the light outlet hole (32) as a center.
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Cited By (1)
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| CN113568194A (en) * | 2021-07-16 | 2021-10-29 | 西安交通大学 | Zero-order-free diffraction light complex amplitude regulation and control system and method based on digital lens |
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