CN114660694A - Depolarizer - Google Patents
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- CN114660694A CN114660694A CN202210298387.8A CN202210298387A CN114660694A CN 114660694 A CN114660694 A CN 114660694A CN 202210298387 A CN202210298387 A CN 202210298387A CN 114660694 A CN114660694 A CN 114660694A
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Abstract
An embodiment of the present invention provides a depolarizer, including: the first delay piece is used for receiving first linearly polarized light incident from a first direction and converting the incident first linearly polarized light into circularly polarized light transmitted along the first direction; a first prism assembly for receiving the circularly polarized light and splitting the circularly polarized light into a second linearly polarized light transmitted along the first direction and a third linearly polarized light transmitted along a second direction; the second direction is parallel to the first direction and is separated by a preset distance; the second delay sheet is used for receiving the third linearly polarized light and delaying the phase of the third linearly polarized light to output fourth linearly polarized light; and the second prism assembly is used for receiving the second linearly polarized light and the fourth linearly polarized light, and outputting the combined light. The depolarizer of the embodiment of the invention can reduce the production cost of the depolarizer and reduce the volume of the depolarizer.
Description
Technical Field
The embodiment of the invention relates to the technical field of optical communication, in particular to a depolarizer.
Background
A depolarizer, also called a depolarizer, is an optical device that changes polarized light into unpolarized light. Light has a vibration direction and a propagation direction, and light whose vibration direction is asymmetric to the propagation direction is called polarized light. In general, the vibration of the light wave vector of natural light is randomly oriented in a direction perpendicular to the propagation direction of light, and is considered to be unpolarized light. The polarized light can be divided into plane polarized light (linearly polarized light), circularly polarized light, elliptically polarized light, partially polarized light and the like; if the vibration direction of the light wave electric vector is only limited in a determined plane, the polarized light is called plane polarized light, and the vibration direction is a straight line in the transmission process, so the polarized light is also called linearly polarized light; if the light wave electric vector changes regularly with time, namely the tail track of the electric vector is in a circular or elliptical shape on a plane vertical to the propagation direction, the light wave electric vector is called circularly polarized light or elliptically polarized light; if the vibration of the light wave electric vector is dominant in a certain direction during the propagation process, the polarized light is called partial polarized light. The related depolarizer is realized by a prism which carries out refraction twice, and has the defects of high cost and long size.
Disclosure of Invention
In view of this, an embodiment of the present invention provides a depolarizer to solve the technical problem of reducing cost and size.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
an embodiment of the present invention provides a depolarizer, including: the first delay piece is used for receiving first linearly polarized light incident from a first direction and converting the incident first linearly polarized light into circularly polarized light transmitted along the first direction; a first prism assembly for receiving the circularly polarized light and splitting the circularly polarized light into a second linearly polarized light transmitted along the first direction and a third linearly polarized light transmitted along a second direction; the second direction is parallel to the first direction and is separated by a preset distance; the second delay sheet is used for receiving the third linearly polarized light and delaying the phase of the third linearly polarized light so as to output fourth linearly polarized light; and the second prism assembly is used for receiving the second linearly polarized light and the fourth linearly polarized light, and outputting the combined light.
In some embodiments, the first prism assembly comprises: the first polarization splitting prism is used for enabling P polarized light in the circularly polarized light to pass along the first direction to form second linearly polarized light and for enabling S polarized light in the circularly polarized light to be reflected along a third direction; the third direction is perpendicular to the second direction and the first direction; and the second polarization beam splitter prism is used for receiving the light along the third direction and reflecting and outputting the third linearly polarized light along the second direction.
In some embodiments, the second prism assembly comprises: the third polarization beam splitter prism is used for the second linearly polarized light to pass through along the first direction; and the fourth polarization beam splitter prism is used for receiving the fourth linearly polarized light, reflecting the first reflected light along the third direction, and reflecting the first reflected light into second reflected light transmitted along the first direction, wherein the second reflected light is combined with the second linearly polarized light passing through the third polarization beam splitter prism.
In some embodiments, the first polarization splitting prism is a right triangular prism, the first polarization splitting prism includes a first right-angle surface, a second right-angle surface and a first inclined surface connected to each other, the first right-angle surface is parallel to the first direction, the second right-angle surface is used for outputting the second linearly polarized light, and an edge of the first right-angle surface, which is far away from the second right-angle surface, is in contact with the first retarder; the second polarization beam splitter prism is a parallelepiped, and comprises a first surface, a second inclined plane, a second surface and a third surface, wherein the second surface and the third surface are positioned on two opposite sides of the first surface, the second surface and the third surface are both parallel to the third direction, the first surface is superposed with the first inclined plane, the second surface is superposed with the emergent plane of the first retarder, and the third surface is coplanar with the second right-angle plane; the second bevel is between the second and third surfaces and opposite the first bevel.
In some embodiments, the third polarization splitting prism is a right triangular prism, the third polarization splitting prism comprises a third right-angled surface, a fourth right-angled surface and a third inclined surface connected to each other, the third right-angled surface is coplanar with the first right-angled surface, and the fourth right-angled surface is used for receiving the second linearly polarized light; the fourth polarization beam splitter prism is a parallelepiped and comprises a fourth surface, a fourth inclined plane, a fifth surface and a sixth surface, wherein the fifth surface and the sixth surface are positioned on two opposite sides of the fourth surface, the fifth surface and the sixth surface are both parallel to the third direction, the fourth surface is superposed with the third inclined plane, and the fourth surface is used for receiving the fourth linearly polarized light and is coplanar with the fourth right-angle plane; the fourth bevel is between the fifth and sixth surfaces and opposite the third bevel.
In some embodiments, the second retarder is a cuboid extending in the second direction, and both end faces of the second retarder in the second direction are parallel to the third direction and located between the third surface of the second polarization splitting prism and the fifth surface of the fourth polarization splitting prism.
In some embodiments, the depolarizer further comprises a light input for entering the first linearly polarized light to the first retarder; the light ray input device is a dual-core collimator.
In some embodiments, the depolarizer further comprises a light output for outputting combined light; the light ray output device is a single-core collimator.
In some embodiments, the depolarizer further comprises an isolator between the light input and the first retarder for reducing reflected light in a direction towards the light input.
In some embodiments, the depolarizer further comprises a base to which the isolator, first retardation plate, first prism assembly, second retardation plate, and second prism assembly are secured; the light ray input device and the light ray output device are respectively abutted to two ends of the base in the first direction.
The embodiment of the invention provides a depolarizer, which comprises a first delay plate, a first prism assembly, a second delay plate and a second prism assembly, wherein the first delay plate is arranged on the first prism assembly; the first retarder is used for converting incident linearly polarized light into circularly polarized light; the first prism assembly is used for dividing incident light into two paths of light rays transmitted along different directions, the second delay piece is used for delaying the phase of the second path of light rays, and the second prism assembly is used for combining and depolarizing the two paths of light rays. The depolarizer of the embodiment of the invention divides the incident light into two beams, and one beam of the light, namely the light of the second light path, passes through the second time delay piece to realize time delay, and finally the light of the two light paths is combined and output through the light combination element. The delay of the light of the second light path is realized through the second delay piece, so that certain optical path difference is generated between the light of the second light path and the light of the first light path, the optical path difference is larger than the coherence length of the depolarized light, and depolarization of polarized light is realized. Therefore, the depolarizer does not need to use a birefringent depolarizing crystal with a long volume, so that the production cost of the depolarizer is reduced, and the volume of the depolarizer is also reduced. Here, the coherence length indicates a distance over which a coherent wave (e.g., an electromagnetic wave) propagates while maintaining a constant degree of coherence. The larger the coherence length and the longer the coherence time, the better the temporal coherence of the light source. The degree of coherence, also called coherence, refers to the properties that a wave needs to possess in order to produce significant interference phenomena. The birefringent depolarization crystal is a combination of a plurality of birefringent crystals, and two paths of light beams form optical path difference in the crystals through the characteristics of the birefringent crystals and the designed crystal length so as to achieve the purpose of depolarization.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It should be understood that the drawings described below are only a part of the drawings of the embodiments of the present invention, and that other drawings may be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a depolarizer of an embodiment of the present invention;
fig. 2 is a schematic light propagation diagram of a depolarizer according to an embodiment of the present invention.
Description of reference numerals:
10. a first retardation plate; 20. a first prism assembly; 21. a first polarization splitting prism; 211. a first right-angle face; 212. a second right-angle surface; 213. a first inclined plane; 22. a second polarization splitting prism; 221. a first surface; 222. a second inclined plane; 223. a second surface; 224. a third surface; 30. a second retarder; 40. A second prism assembly; 41. a third polarization beam splitter prism; 411. a third right-angle surface; 412. a fourth right-angle surface; 413. a third inclined plane; 42. a fourth polarization beam splitter prism; 421. a fourth surface; 422. a fourth slope; 423. a fifth surface; 424. a sixth surface; 50. a light ray input device; 60. a light output device; 70. an isolator; 81. a base; 82. a main casing; 91. a first linearly polarized light; 92. circularly polarized light; 921. s polarizing; 93. a second linearly polarized light; 94. a third linearly polarized light; 95. a fourth linearly polarized light; 96. a first reflected light ray; 97. a second reflected light ray; 98. unpolarized light.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. Also, the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from these embodiments without inventive step, are within the scope of protection of the present invention.
The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and solutions can be formed by combining different features. In order to avoid unnecessary repetition, various combinations of the specific features of the embodiments of the present invention are not described in detail.
In the following description, the term "first/second/so" is used merely to distinguish different objects and does not mean that there is a common or relationship between the objects. It should be understood that, unless otherwise specified, the directional descriptions "upper", "lower", "outer", "inner" are directions in the normal use state, and the "left" and "right" directions indicate left and right directions illustrated in the specifically corresponding schematic drawings.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the invention provides a depolarizer, which is used at a transmitting end of an optical module and has the following functions: most laser light sources emit polarized light, and the emitting end of the optical module needs unpolarized light, so that the polarized light needs to be converted into unpolarized light by the depolarizer.
Embodiments of the present invention provide a depolarizer, as shown in fig. 1 and 2, comprising a first retardation plate 10, a first prism assembly 20, a second retardation plate 30, and a second prism assembly 40. The first retardation plate 10 is configured to receive a first linearly polarized light 91 incident from a first direction, and convert the incident first linearly polarized light 91 into a circularly polarized light 92 transmitted along the first direction. Here, the first retardation plate 10 serves to convert the first linearly polarized light 91 into circularly polarized light 92 to match the light splitting of the following first prism assembly 20. In some embodiments, the first retarder 10 may be a λ/4 phase retarder, which may be made of a birefringent wafer, with its optical axis parallel to the wafer surface. When linearly polarized light is vertically incident on a wafer, the vibration direction of the linearly polarized light is vertical to the propagation direction of the light, and the included angle theta (theta is not equal to 0) is formed between the optical axis of the wafer and the vibration direction of the linearly polarized light, so that the incident vibration light is decomposed into two components of o vibration vertical to the optical axis and e vibration parallel to the optical axis, wherein the two components correspond to o light (an ordinary light, the refractive index of the light is constant regardless of the direction when the light propagates in the wafer) and e light (an extraordinary light, the e light is the light vibrating perpendicular to the o light, and the light has different refractive indexes when the light propagates towards different directions because the vibration direction of the light is vertical to the o light), and the wafer can enable an additional optical path difference to be generated between the two light vibrations vertical to each other because the refractive indexes of the o light and the e light are different. When the lambda/4 phase delayer is made, the lambda/4 additional optical path difference between o light and e light is standard. The two beams of light with the optical path difference lambda/4 are superimposed into circularly polarized light 92. After the incident light is converted into circularly polarized light through the lambda/4 phase delayer, the intensities of the first path of light and the second path of light can be consistent, and the influence of the polarization vibration direction of the incident light cannot be caused. Note that the birefringent crystal here is not the same as the birefringent depolarizing crystal described above, but the function of the two is different, and the volume is also very different.
As shown in fig. 1 and 2, first prism assembly 20 is configured to receive circularly polarized light 92 and split circularly polarized light 92 into second linearly polarized light 93 transmitted in a first direction and third linearly polarized light 94 transmitted in a second direction; the second direction is parallel to the first direction and spaced apart by a predetermined distance. Here, the first prism assembly 20 may be a combination of two or more prisms for separating P-polarized light (P-polarized light) and S-polarized light (S-polarized light) of the circularly polarized light 92 and transmitting them along different paths. Here, the first direction and the second direction are two different routes, and the first direction and the second direction are both left and right directions as shown in fig. 1, but are located at different heights. P-polarized means that the polarization vector of the light is in the plane containing the input and reflected light beams, and S-polarized means that the polarization vector of the light is perpendicular to the plane containing the input and reflected light beams.
In some embodiments, as shown in fig. 1 and 2, the first prism assembly 20 may include a first polarization beam splitter 21 (PBS) and a second polarization beam splitter 22. Wherein the first polarization splitting prism 21 passes P-polarized light in the circularly polarized light 92 in the first direction to form second linearly polarized light 93, and reflects S-polarized light 921 in the circularly polarized light 92 in the third direction; the third direction is perpendicular to the second direction and the first direction (the third direction is the up-down direction shown in fig. 1); that is, the first polarization splitting prism 21 can split the circularly polarized light 92. In some embodiments, the light incident surface of the first polarization splitting prism 21 for receiving the circularly polarized light 92 may be coated with a polarization splitting film to split the circularly polarized light 92, i.e. the light splitting surface of the light incident surface of the first polarization splitting prism 21.
In some embodiments, as shown in fig. 1 and 2, the first polarization splitting prism 21 may be a right triangular prism, and the first polarization splitting prism 21 includes a first right-angled surface 211, a second right-angled surface 212, and a first inclined surface 213 connected to each other. Here, the first inclined plane 213 is the splitting plane above, and is plated with a polarization splitting film. The first right-angle surface 211 is parallel to the first direction, the second right-angle surface 212 is used for outputting the second linearly polarized light 93, and the second right-angle surface 212 may be coated with an antireflection film. The edge of the first angled surface 211 remote from the second angled surface 212 contacts the first retarder 10, so that the structure of the depolarizer can be more compact.
As shown in fig. 1 and 2, the second polarization splitting prism 22 receives the light in the third direction and reflects and outputs a third linearly polarized light 94 in the second direction. The second polarization splitting prism 22 is provided with a reflection surface in the third direction for reflecting the light in the third direction, i.e., the S-polarized light 921 in the circularly polarized light 92, and the reflection surface may be coated with a reflection film. In some embodiments, the second polarization beam splitter prism 22 is a parallelepiped, and the second polarization beam splitter prism 22 includes a first surface 221, a second inclined surface 222, and a second surface 223 and a third surface 224 on two opposite sides of the first surface 221. Wherein the first surface 221 coincides with the first inclined surface 213 and the second surface 223 and the third surface 224 are both parallel to the third direction. That is, the third linearly polarized light 94 with the first surface in the third direction enters the light incident surface of the second polarization splitting prism 22. The coincidence of the second surface 223 with the exit surface of the first retarder 10, as well as the contact of the edge of the first right-angle surface 211 remote from the second right-angle surface 212 with the first retarder 10, also contributes to a more compact depolarizer. Meanwhile, the second surface 223 is a light incident surface of the circularly polarized light 92, and the second surface 223 may be coated with an antireflection film to facilitate the smooth penetration of the circularly polarized light 92. The third surface 224 is coplanar with the second right-angle surface 212, which is more favorable for the installation and debugging of the second polarization splitting prism 22. The second slope 222 is between the second surface 223 and the third surface 224, and is opposite to the first slope 213. The second inclined surface 222 is used for reflecting the light ray incident in the third direction to form a third linearly polarized light 94 along the second direction. That is, the second slope 222 is a reflective surface, and the second slope 222 may be coated with a reflective film.
As shown in fig. 1 and 2, the second retardation plate 30 is for receiving the third linearly polarized light 94 and retarding the phase of the third linearly polarized light 94 to output a fourth linearly polarized light 95. Here, the second retardation plate 30 delays or retards the light of the second optical path, so that the light of the second optical path and the light of the first optical path generate a certain optical path difference, and the optical path difference satisfies a condition that the coherent length is greater than that of the depolarized light, thereby realizing depolarization of the polarized light. In some embodiments, the second retardation plate 30 is a rectangular parallelepiped extending in the second direction, and both end faces of the second retardation plate 30 in the second direction are parallel to the third direction and located between the third surface 224 of the second polarization splitting prism 22 and the fifth surface 423 of the fourth polarization splitting prism 42. That is, the third linearly polarized light 94 is output from the second polarization splitting prism 22 perpendicular to the third surface 224, enters the second retarder 30 perpendicular to the left end surface (with reference to fig. 1) of the second retarder 30, is output perpendicular to the right end surface of the second retarder 30, and enters the fourth polarization splitting prism 42 perpendicular to the fifth surface 423.
In some embodiments, the second retarder 30 may be a glass sheet. The glass sheet can effectively delay light on one hand, and on the other hand, is favorable for reducing cost. How long the second retardation plate 30 can be delayed depends on the length of the glass sheet in the second direction, which can be determined according to the optical path of the light of the second optical path before the light is combined. Because the light of the second optical path will undergo several reflections during transmission, the optical path length of the light of the second optical path will change. Therefore, when the length of the glass sheet in the second direction is set, the integrated value of the optical path change of each reflecting surface needs to be considered, so that the optical path difference between the first optical path and the second optical path is larger than the coherence length of the depolarized light. The change value of the optical path length can be calculated by theory, but still needs to be determined after actual debugging before mass production.
As shown in fig. 1 and fig. 2, the second prism assembly 40 is configured to receive the second linearly polarized light 93 and the fourth linearly polarized light 95, and output after combining the light. Here, the second prism assembly 40 may be a combination of two or more prisms, and is configured to change the transmission directions of the second linearly polarized light 93 and/or the fourth linearly polarized light 95 to be the same, and then combine the light and output. In some embodiments, the second prism assembly 40 includes a third polarization beam splitter prism 41 and a fourth polarization beam splitter prism 42. The third polarization splitting prism 41 is used for the second linearly polarized light 93 to pass through along the first direction; that is, the third polarization splitting prism 41 functions only to transmit light.
As shown in fig. 1 and 2, the fourth polarization splitting prism 42 is configured to receive the fourth linearly polarized light 95 and reflect the first reflected light 96 along the third direction, and is configured to reflect the first reflected light 96 into the second reflected light 97 transmitted along the first direction, and the second reflected light 97 is combined with the second linearly polarized light 93 passing through the third polarization splitting prism 41.
In some embodiments, as shown in fig. 1 and 2, the third polarization splitting prism 41 is a right triangular prism, and the third polarization splitting prism 41 includes a third right-angled surface 411, a fourth right-angled surface 412 and a third inclined surface 413 connected to each other, the third right-angled surface 411 being coplanar with the first right-angled surface 211, and the fourth right-angled surface 412 being configured to receive the second linearly polarized light 93. The fourth right-angle surface 412 is only used for transmitting the second linearly polarized light 93. In some embodiments, as shown in fig. 1 and 2, the fourth polarization splitting prism 42 is a parallelepiped, and the fourth polarization splitting prism 42 includes a fourth surface 421, a fourth inclined surface 422, and fifth and sixth surfaces 423 and 424 on opposite sides of the fourth surface 421. The fifth surface 423 and the sixth surface 424 are parallel to the third direction, the fourth surface 421 coincides with the third inclined surface 413, and the fifth surface 423 is used for receiving the fourth linearly polarized light 95 and is coplanar with the fourth right-angle surface 412; the fourth slope 422 is between the fifth surface 423 and the sixth surface 424, and is opposite to the third slope 413. That is, the fifth surface 423 is the light incident surface of the fourth polarization splitting prism 42 into which the fourth linearly polarized light 95 transmitted along the second direction enters. Then, the fourth linearly polarized light 95 enters the fourth inclined plane 422 through the light incident surface, and reflects the first reflected light 96 along the third direction. Then, the first reflected light 96 enters the inner wall surface of the fourth surface 421 and reflects the second reflected light 97 transmitted along the first direction, and the transmission direction of the second reflected light 97 is the same as that of the second linearly polarized light 93, so that the second reflected light can be combined with the second linearly polarized light 93 to output, and the unpolarized light 98 is formed.
In some embodiments, as shown in fig. 1 and 2, the depolarizer further comprises a light input 50 for entering a first linearly polarized light 91 to the first retarder 10; light input device 50 is a dual-core collimator. The dual-core collimator is used to change the divergent light emitted from the light source into parallel light traveling in the first direction and incident on the first retardation plate 10.
In some embodiments, as shown in fig. 1 and 2, the depolarizer further includes a light outputter 60 for outputting combined light; the light output device 60 is a single-core collimator. The single-core collimator is used for further collimating the light after light combination so as to better transmit the light to the next optical device.
In some embodiments, as shown in fig. 1 and 2, the depolarizer further includes an isolator 70, the isolator 70 being located between the light input device 50 and the first retardation plate 10 for reducing reflected light towards the light input device 50. In some embodiments, the isolator 70 is composed of a wedge, a faraday rotator and a magnetic ring, i.e. the wedge and the faraday rotator are used for isolation to prevent the light reflected from the back from being incident into the light source and affecting the light source. Moreover, the wedge angle sheet also has a beam combination function of combining two beams of incident light into one beam of light, so that the total energy of the light is not reduced while the quantity of the light is reduced. The Faraday rotator is additionally provided with a magnetic ring, so that a magnetic field does not need to be additionally arranged, and the structure of the depolarizer is further compact.
In some embodiments, as shown in fig. 1 and 2, the depolarizer further comprises a base 81, the isolator 70, the first retardation plate 10, the first prism assembly 20, the second retardation plate 30, and the second prism assembly 40 are all fixed to the base 81; that is, the base 81 fixes the relative positions of the isolator 70, the first retardation plate 10, the first prism assembly 20, the second retardation plate 30 and the second prism assembly 40, so that the positions will not change during operation, thereby affecting the function of the depolarizer. In some embodiments, the base 81 may be recessed to correspond to the shape of the isolator 70, the first retardation plate 10, the first prism assembly 20, the second retardation plate 30 and the second prism assembly 40, and then the isolator 70, the first retardation plate 10, the first prism assembly 20, the second retardation plate 30 and the second prism assembly 40 are placed in the recessed portions and finally fixed by adhesive or laser welding. In some embodiments, the isolator 70, the first retardation plate 10, the first prism assembly 20, the second retardation plate 30 and the second prism assembly 40 can be mounted by positioning on the base 81 by optical image recognition technology or spot imaging technology or beam coupling technology, and then fixing by adhesive bonding or fixing by laser welding. In this way, precise mounting of the various optical devices described above can be achieved.
As shown in fig. 1 and 2, the light input device 50 and the light output device 60 respectively abut against two ends of the base 81 in the first direction to realize the input and output of light. The light input device 50, the light output device 60 and the base 81 may be externally sleeved with a general sleeve 82 to fix the relative positions of the light input device 50, the light output device 60 and the base 81.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A depolarizer, comprising:
the first delay piece is used for receiving first linearly polarized light incident from a first direction and converting the incident first linearly polarized light into circularly polarized light transmitted along the first direction;
a first prism assembly for receiving the circularly polarized light and splitting the circularly polarized light into a second linearly polarized light transmitted along the first direction and a third linearly polarized light transmitted along a second direction; the second direction is parallel to the first direction and is separated by a preset distance;
the second delay sheet is used for receiving the third linearly polarized light and delaying the phase of the third linearly polarized light to output fourth linearly polarized light;
and the second prism assembly is used for receiving the second linearly polarized light and the fourth linearly polarized light, and outputting the combined light.
2. A depolarizer according to claim 1, wherein said first prism assembly comprises:
the first polarization splitting prism is used for P polarized light in the circularly polarized light to pass along the first direction so as to form second linearly polarized light, and is used for S polarized light in the circularly polarized light to be reflected along a third direction; the third direction is perpendicular to the second direction and the first direction;
and the second polarization beam splitter prism is used for receiving the light along the third direction and reflecting and outputting the third linearly polarized light along the second direction.
3. A depolarizer according to claim 2, wherein said second prism assembly comprises:
the third polarization beam splitter prism is used for the second linearly polarized light to pass through along the first direction;
and the fourth polarization beam splitter prism is used for receiving the fourth linearly polarized light, reflecting the first reflected light along the third direction, and reflecting the first reflected light into second reflected light transmitted along the first direction, wherein the second reflected light is combined with the second linearly polarized light passing through the third polarization beam splitter prism.
4. A depolarizer according to claim 3, wherein said first polarizing beam splitter prism is a right triangular prism, said first polarizing beam splitter prism comprises a first right-angled surface, a second right-angled surface and a first inclined surface connected to each other, said first right-angled surface is parallel to said first direction, said second right-angled surface is used for outputting said second linearly polarized light, and an edge of said first right-angled surface away from said second right-angled surface is in contact with said first retarder;
the second polarization beam splitter prism is a parallelepiped, and comprises a first surface, a second inclined surface, and a second surface and a third surface which are positioned on two opposite sides of the first surface, wherein the second surface and the third surface are both parallel to the third direction, the first surface is superposed with the first inclined surface, the second surface is superposed with the emergent surface of the first retarder, and the third surface is coplanar with the second right-angle surface; the second bevel is between the second and third surfaces and opposite the first bevel.
5. A depolarizer according to claim 4, wherein said third polarizing beam splitter prism is a right triangular prism, said third polarizing beam splitter prism comprising a third right-angled surface, a fourth right-angled surface and a third inclined surface connected to each other, the third right-angled surface being coplanar with said first right-angled surface, said fourth right-angled surface for receiving said second linearly polarized light;
the fourth polarization beam splitter prism is a parallelepiped and comprises a fourth surface, a fourth inclined plane, a fifth surface and a sixth surface, wherein the fifth surface and the sixth surface are positioned on two opposite sides of the fourth surface, the fifth surface and the sixth surface are both parallel to the third direction, the fourth surface is superposed with the third inclined plane, and the fourth surface is used for receiving the fourth linearly polarized light and is coplanar with the fourth right-angle plane; the fourth bevel is between the fifth and sixth surfaces and opposite the third bevel.
6. The depolarizer of claim 5, wherein the second retarder is a cuboid extending in the second direction, and both end faces of the second retarder in the second direction are parallel to the third direction and located between the third surface of the second polarization splitting prism and the fifth surface of the fourth polarization splitting prism.
7. A depolarizer according to any of claims 1-6, further comprising a light input for entering said first linearly polarized light into said first retarder; the light ray input device is a dual-core collimator.
8. A depolarizer as recited in claim 7, further comprising a light output for outputting combined light; the light ray output device is a single-core collimator.
9. A depolarizer as recited in claim 8, further comprising an isolator positioned between the light input and the first retarder for reducing reflected light in a direction toward the light input.
10. A depolarizer in accordance with claim 9, further comprising a base to which said isolator, first retardation plate, first prism assembly, second retardation plate, and second prism assembly are secured; the light ray input device and the light ray output device are respectively abutted to two ends of the base in the first direction.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1376945A (en) * | 2002-04-19 | 2002-10-30 | 武汉光迅科技有限责任公司 | Polarized light interference method for comb-shaped sub-wave |
| CN2611881Y (en) * | 2003-05-09 | 2004-04-14 | 中国科学院上海光学精密机械研究所 | Device for precisely measuring ultrashort laser pulse time synchronization |
| CN102004326A (en) * | 2010-10-22 | 2011-04-06 | 福州高意通讯有限公司 | Depolarization delay device |
| CN201859277U (en) * | 2010-06-17 | 2011-06-08 | 西北工业大学 | Optical isolator for fiber-optic communication |
| CN203732814U (en) * | 2014-03-19 | 2014-07-23 | 昂纳信息技术（深圳）有限公司 | Optical comb filter with low dispersion |
| CN105140772A (en) * | 2015-09-30 | 2015-12-09 | 中国科学院合肥物质科学研究院 | Electro-optic Q-switch capable of completely compensating for laser thermal depolarization |
| CN106683310A (en) * | 2017-03-15 | 2017-05-17 | 河南理工大学 | Laser alarm for preventing conventional optical interference |
| CN107390324A (en) * | 2017-06-29 | 2017-11-24 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | A kind of integrated optical fiber component |
| CN113358216A (en) * | 2021-05-31 | 2021-09-07 | 中国科学院微电子研究所 | Polarized light detection method, photon integrated chip and detector |
| CN215297755U (en) * | 2021-04-14 | 2021-12-24 | 武汉恩达通科技有限公司 | Four-port circulator for single-fiber bidirectional communication and optical module |
-
2022
- 2022-03-24 CN CN202210298387.8A patent/CN114660694A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1376945A (en) * | 2002-04-19 | 2002-10-30 | 武汉光迅科技有限责任公司 | Polarized light interference method for comb-shaped sub-wave |
| CN2611881Y (en) * | 2003-05-09 | 2004-04-14 | 中国科学院上海光学精密机械研究所 | Device for precisely measuring ultrashort laser pulse time synchronization |
| CN201859277U (en) * | 2010-06-17 | 2011-06-08 | 西北工业大学 | Optical isolator for fiber-optic communication |
| CN102004326A (en) * | 2010-10-22 | 2011-04-06 | 福州高意通讯有限公司 | Depolarization delay device |
| CN203732814U (en) * | 2014-03-19 | 2014-07-23 | 昂纳信息技术（深圳）有限公司 | Optical comb filter with low dispersion |
| CN105140772A (en) * | 2015-09-30 | 2015-12-09 | 中国科学院合肥物质科学研究院 | Electro-optic Q-switch capable of completely compensating for laser thermal depolarization |
| CN106683310A (en) * | 2017-03-15 | 2017-05-17 | 河南理工大学 | Laser alarm for preventing conventional optical interference |
| CN107390324A (en) * | 2017-06-29 | 2017-11-24 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | A kind of integrated optical fiber component |
| CN215297755U (en) * | 2021-04-14 | 2021-12-24 | 武汉恩达通科技有限公司 | Four-port circulator for single-fiber bidirectional communication and optical module |
| CN113358216A (en) * | 2021-05-31 | 2021-09-07 | 中国科学院微电子研究所 | Polarized light detection method, photon integrated chip and detector |
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