CN110989182A - Beam combination light source device - Google Patents
Beam combination light source device Download PDFInfo
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- CN110989182A CN110989182A CN201911204705.4A CN201911204705A CN110989182A CN 110989182 A CN110989182 A CN 110989182A CN 201911204705 A CN201911204705 A CN 201911204705A CN 110989182 A CN110989182 A CN 110989182A
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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
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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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
- G02B27/10—Beam splitting or combining systems
- G02B27/1086—Beam splitting or combining systems operating by diffraction only
Abstract
The invention discloses a beam combination light source device, wherein at least two light beam generating parts are respectively used for generating light beams with different wavelengths, each light beam with different wavelengths enters an optical medium body from an input surface and is incident to a grating layer, the first reflecting surface and the second reflecting surface enable each light beam with different wavelengths entering the optical medium body to be transmitted back and forth between the first reflecting surface and the second reflecting surface, each light beam is guided to be transmitted along the length direction of the grating layer, the grating layer enables each light beam with different wavelengths incident to the grating layer together each time to be subjected to diffraction action, the spacing distance of each light beam is reduced, the included angle of the transmission direction is reduced, each light beam is converged into one light beam after being subjected to diffraction action for a plurality of times, and the light beam is output by an output surface. The beam combination light source device diffracts beams with different wavelengths for multiple times through the grating structure in the optical medium body, so that the dispersion capacity is improved, the wavelength interval of unit beams participating in beam combination can be compressed, the size of the beam combination structure can be reduced, and the size of the beam combination light source device is reduced.
Description
Technical Field
The invention relates to the technical field of beam combination light sources, in particular to a beam combination light source device.
Background
The spectrum beam combination is one of the main technical approaches for realizing high-power and high-beam-quality laser output in the current laser field, and the beam combination power can be the sum of the unit beam powers through the spectrum beam combination, and the beam quality keeps the unit beam quality unchanged. Whether a fiber laser, a solid laser or a semiconductor laser, the spectral beam combination becomes the key for realizing the output of single-beam high-power and high-brightness laser by multi-beam unit light.
The current spectrum beam combination mainly realizes the following processes: after the unit beams with different wavelengths are collimated, the incident angle of the incident beam to the grating is adjusted by the conversion lens, and then the unit beams are converged into a single beam by the dispersion action of the diffraction grating to be output. The diffraction grating in the spectrum beam combining structure is a monolithic grating, the diffraction capability of the diffraction grating is weak, in order to realize optical coupling in a certain spectrum width, the focal length of the adopted conversion lens is long and can reach the meter level, so that the whole spectrum beam combining structure is large, the size is usually in the meter level, each element is separated, the integration level is not high, and the reliability and the application occasion of the spectrum beam combining light source device are correspondingly influenced.
Disclosure of Invention
The invention aims to provide a beam combining light source device which has the advantages of small volume, miniaturization and integration compared with the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a beam combining light source device comprising an optical medium body and at least two beam generating portions for generating beams of different wavelengths, respectively, the optical medium body comprising:
the input surface is used for receiving the light beams with different wavelengths and guiding the light beams to be incident to the grating layer;
the first reflecting surface and the second reflecting surface are respectively positioned at two sides of the grating layer and are used for enabling the light beams with different wavelengths entering the optical medium body to propagate back and forth between the first reflecting surface and the second reflecting surface so as to guide the light beams to propagate along the length direction of the grating layer, and the light beams are diffracted after passing through the grating layer in the path that the light beams propagate from the first reflecting surface to the second reflecting surface or from the second reflecting surface to the first reflecting surface each time;
the grating layer is arranged in the optical medium body and is used for diffracting the light beams with different wavelengths which are incident to the grating layer together every time, so that the spacing distance of the light beams is reduced, the included angle of the propagation direction is reduced, and the light beams are converged into one beam after being subjected to diffraction action for a plurality of times;
and the output surface is used for outputting the combined beam of light.
Preferably, the input surface is a curved surface having a converging effect on the light beam.
Preferably, the optical system further comprises a collimating assembly for collimating the light beams generated by the light beam generating parts and guiding the collimated light beams to be incident on the input surface.
Preferably, the output face is a plane, the output face being perpendicular to the direction of propagation of the outgoing merged beam.
Preferably, the output surface is a curved surface having a collimating effect on the output merged light beam.
Preferably, the first reflecting surface is parallel to the second reflecting surface.
Preferably, the refractive index of the grating layer periodically changes along the length direction of the grating layer.
Preferably, the optical medium body includes at least two grating layers, the at least two grating layers are sequentially disposed in the optical medium body in layers and are both located between the first reflecting surface and the second reflecting surface, and each beam sequentially passes through each grating layer to generate a diffraction effect in a path where each beam is transmitted from the first reflecting surface to the second reflecting surface or from the second reflecting surface to the first reflecting surface each time.
Preferably, the light beam generating part comprises a rear cavity surface for reflecting light back into the light beam generating part cavity and a front cavity surface for transmitting the generated light beam;
the output surface has a reflection effect on light and is also used for forming a resonant cavity with the rear cavity surface of each light beam generation part respectively so as to lock the wavelength of the light beam generated by each light beam generation part respectively.
Preferably, the optical dielectric body is a quartz dielectric body, a germanium dielectric body, a silicon dielectric body or a semiconductor material dielectric body.
As can be seen from the above technical solutions, the combined light source device provided by the present invention includes an optical medium and at least two light beam generating portions, where the at least two light beam generating portions are respectively configured to generate light beams with different wavelengths. The grating layer is arranged in the optical medium body, the first reflecting surface and the second reflecting surface are respectively positioned at two sides of the grating layer, light beams with different wavelengths generated by the light beam generating parts enter the optical medium body from the input surface and enter the grating layer, the first reflecting surface and the second reflecting surface enable the light beams with different wavelengths entering the optical medium body to be transmitted back and forth between the first reflecting surface and the second reflecting surface, so that the light beams are guided to be transmitted along the length direction of the grating layer, the light beams are diffracted by the grating layer in the path that the light beams are transmitted to the second reflecting surface from the first reflecting surface or transmitted to the first reflecting surface from the second reflecting surface each time, the grating layer diffracts the light beams with different wavelengths which enter the grating layer at each time together to reduce the spacing distance of the light beams and the included angle of the transmission direction, so that the light beams are converged into one light beam after being diffracted for a plurality of times, and output from the output face.
The beam combination light source device diffracts the light beams with different wavelengths for multiple times through the grating structure in the optical medium body, improves the dispersion capacity, can compress the wavelength interval of the unit light beams participating in beam combination, can avoid using a large-size conversion lens compared with the prior art, realizes optical coupling in the same spectral width range, and can reduce the volume of the beam combination structure, so that the volume of the beam combination light source device is reduced, and the beam combination light source device has the advantages of miniaturization and integration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a beam combining light source apparatus according to an embodiment of the present invention;
FIG. 2 is a perspective view of the optical media body of FIG. 1;
FIG. 3 is a schematic diagram of a propagation path of the beam combining light source apparatus shown in FIG. 1;
FIG. 4 is a diagram of a conventional spectral beam combining;
FIG. 5 is a schematic diagram of an optical medium body in a combined beam source apparatus according to another embodiment of the present invention;
fig. 6 is a schematic diagram of a beam combining light source apparatus according to another embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a beam combination light source device, which comprises an optical medium body and at least two light beam generating parts, wherein the at least two light beam generating parts are respectively used for generating light beams with different wavelengths, and the optical medium body comprises:
the input surface is used for receiving the light beams with different wavelengths and guiding the light beams to be incident to the grating layer;
the first reflecting surface and the second reflecting surface are respectively positioned at two sides of the grating layer and are used for enabling the light beams with different wavelengths entering the optical medium body to propagate back and forth between the first reflecting surface and the second reflecting surface so as to guide the light beams to propagate along the length direction of the grating layer, and the light beams are diffracted after passing through the grating layer in the path that the light beams propagate from the first reflecting surface to the second reflecting surface or from the second reflecting surface to the first reflecting surface each time;
the grating layer is arranged in the optical medium body and is used for diffracting the light beams with different wavelengths which are incident to the grating layer together every time, so that the spacing distance of the light beams is reduced, the included angle of the propagation direction is reduced, and the light beams are converged into one beam after being subjected to diffraction action for a plurality of times;
and the output surface is used for outputting the combined beam of light.
Any one of the different wavelength light beams is a light beam having a certain central wavelength and a certain spectral width. The central wavelengths of the light beams with different wavelengths are different, and the spectrums of the light beams are not overlapped.
The optical medium body is a medium that allows a light beam to propagate inside thereof. Based on the reflection action of the first reflection surface and the second reflection surface of the optical medium body on the light, the light beams with different wavelengths are made to propagate back and forth between the first reflection surface and the second reflection surface, so that the light beams are guided to propagate along the length direction of the grating layer. The grating layer in the optical medium body has a grating structure, and the light beam incident to the grating layer can generate diffraction effect through the grating layer. Each light beam passes through the grating layer to generate diffraction action in the path that each light beam is transmitted to the second reflecting surface from the first reflecting surface or transmitted to the first reflecting surface from the second reflecting surface, each light beam with different wavelengths which is simultaneously incident to the grating layer at each time generates diffraction action, the spacing distance of each light beam is reduced, the included angle of the transmission direction is reduced, and each light beam is converged into one light beam after being subjected to diffraction action for a plurality of times by the grating layer in the transmission process and is output by the output surface.
The beam combination light source device of the embodiment enables beams with different wavelengths to pass through the grating layer repeatedly for a plurality of times through the reflecting surface of the optical medium body, diffracts the beams with different wavelengths for a plurality of times through the grating layer, improves the dispersion capacity, can compress the wavelength intervals of the unit beams participating in beam combination, can avoid using a conversion lens with larger size compared with the prior art, realizes optical coupling in the same spectral width range, can reduce the volume of a beam combination structure, and has the advantages of miniaturization and integration.
The beam combining light source device will be described in detail with reference to the accompanying drawings and the detailed description. Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a beam combining light source device according to the present embodiment, and fig. 2 is a perspective view of an optical medium in fig. 1. As can be seen, the combined beam light source device includes an optical medium body 100 and at least two beam generating parts 200. The at least two beam generating parts 200 are respectively used for generating beams with different wavelengths, and the beam generating parts 200 may be various types of lasers, and may be fiber lasers, all-solid-state lasers, semiconductor lasers, and the like.
Preferably, the combined light source device of the present embodiment further includes a collimating assembly for collimating the light beams generated by the light beam generating portions 200 and guiding the collimated light beams to be incident on the input surface 104. Each light beam generating unit 200 generates a light beam, which is processed into collimated light by the collimating component and then enters the input surface.
The first reflective surface 101 and the second reflective surface 102 are respectively located on two sides of the grating layer 103, so that the light beams with different wavelengths entering the optical medium 100 reciprocally propagate between the first reflective surface 101 and the second reflective surface 102 based on the reflection of the two light beams, so as to guide the light beams to propagate along the length direction of the grating layer 103, and the light beams are diffracted by the grating layer 103 on the way that the light beams propagate from the first reflective surface 101 to the second reflective surface 102 or from the second reflective surface 102 to the first reflective surface 101 each time. The grating layer 103 is disposed in the optical medium 100, and configured to diffract the light beams with different wavelengths, which are incident to the grating layer 103 together each time, so that the separation distance between the light beams is reduced, the included angle in the propagation direction is reduced, and the light beams are converged into one beam after being diffracted for several times. The combined light beam is output by the output face 105.
Referring to fig. 3, fig. 3 is a schematic diagram of a propagation path of the combined light source apparatus shown in fig. 1, wherein the combined light source apparatus includes three light beam generating portions as an example. The three light beam generating parts 200 respectively generate light beams with different wavelengths, and the central wavelength of each light beam is lambda1、λ2And λ3. Light beams with different wavelengths enter the optical medium body 100 from the input surface 104 and enter the grating layer 103, and the light beams diffract on the grating layer 103, so that the spacing distance between the light beams is reduced, and the included angle between the light beams in the propagation direction is reduced; then, each light beam is reflected back to the grating layer 103 through the second reflecting surface 102, and is diffracted again through the grating layer 103, and then each light beam is reflected back to the grating layer 103 by the first reflecting surface 101, so that each light beam with different wavelengths propagates back and forth between the first reflecting surface 101 and the second reflecting surface 102, and each light beam is guided to propagate along the length direction of the grating layer 103. The light beams with different wavelengths are diffracted for several times through the grating layer in the transmission process, the spacing distance of the light beams is continuously reduced, the included angle of the transmission direction is continuously reduced, the light beams form a combined beam in a near field and far field superposition mode in the last diffraction, and therefore the light beams are combinedIs a bundle.
Referring to fig. 4, fig. 4 is a schematic diagram of a conventional spectrum beam combination, which shows that unit laser beams 11, 12, and 13 with different central wavelengths and narrow line widths are respectively incident on a grating 10 at a certain angle, and are diffracted by the grating 10 to be combined into a single beam 14 for output. This spectral beam combining structure diffracts each light beam only once. The chromatic dispersion capability of the optical medium body in the beam combination light source device of the embodiment is related to the diffraction times of each light beam through the grating layer, and if the grating layer of the beam combination light source device is a first-order diffraction grating and each light beam is diffracted for N times through the grating layer, the equivalent chromatic dispersion D of the beam combination structure of the beam combination light source device is the same as that of the first-order diffraction gratingTComprises the following steps:
wherein the content of the first and second substances,
representing the dispersion of the beam in a single pass through the grating layer. Therefore, in the beam combining structure of the beam combining light source device of the present embodiment, each light beam is diffracted by the grating layer N times, and if the dispersion of the light beam passing through the grating layer once in the beam combining light source device is the same as the dispersion of the conventional grating shown in fig. 4, the dispersion capability is improved by (N-1) times compared with the conventional spectral beam combining method.
The spectral width Δ λ of the output merged beam is the ratio of the incident angle interval Δ θ to the dispersion D:
then the beam combining light source device outputs the spectral bandwidth delta lambda of the light beam after each light beam is diffracted for N times by the grating layerTComprises the following steps:
it can be seen that the spectral width of the output beam of the beam combining light source device is 1/N of the spectral width of the single pass of the beam through the grating layer, and the spectral width is compressed by (N-1), i.e. the beam combining light source device can couple N times of unit beams in the same spectral width range, thereby outputting the sum of the optical power and the optical powerThe brightness is improved by (N-1) times.
According to the geometrical-optics transformation relation, the angle interval delta theta of the unit beams incident to the grating structure is related to the space interval d of the unit beams and the transformation focal length f, and since f is generally far greater than d, the following are provided:
then it is determined that,
it can be seen that the spectral width of the combined beam is inversely proportional to the focal length f of the transform lens and the dispersion D of the spectral beam combining structure. The dispersion capacity of the beam combination structure of the beam combination light source device is improved by (N-1) times, and if the conversion lens with the same focal length is adopted, the spectral bandwidth of the combined light can be compressed to 1/N of the original bandwidth; if the unit light beams with the same wavelength interval delta lambda are combined, the focal length of the corresponding conversion lens can be shortened to 1/N of the original focal length, and therefore the volume of the spectrum combination structure is reduced.
Further, as the focal length of the conversion lens is shortened, the conversion lens can be directly integrated on an input surface of the optical medium body which is a spectrum beam combination structure, and the input surface is prepared into a curved surface with an equivalent focal length F, wherein F is F/N, and F represents the focal length of the conversion lens corresponding to the spectrum width delta lambda of the primary diffraction spectrum based on the existing spectrum beam combination mode.
Further, in order to realize the overlapping of the unit beams in the spectral beam combining structure, that is, the last diffraction inside the optical medium, the propagation equivalent distance L of the unit beams in the optical medium is required to be the conversion lens focal length F after considering the diffraction effect. Since the unit light beam propagates inside the optical medium body, the equivalent optical path is L ═ nl, where n is the refractive index of the optical medium body, and the physical distance L of propagation inside the optical medium body is:
as can be seen from the above formula, the beam propagation distance using the present combined beam source device is 1/(N × N) of the conventional combined spectrum beam with the same combined spectrum band width Δ λ. In addition, the transmission optical path of the unit light beam in the optical medium body is folded back and forth, so that the size of the whole spectrum beam combination light source device can be further reduced.
Optionally, the grating layer 103 is a transmissive grating layer, and the refractive index of the grating layer 103 may periodically change along the length direction of the grating layer 103, and the refractive index of the grating layer 103 changes along the length direction in one period, so as to form a grating structure. In particular implementations, the refractive index of the grating layer 103 may vary gradually or in steps along its length during a period. In actual manufacturing, the grating layer can be prepared by adopting excimer laser direct writing, holographic exposure or secondary epitaxial growth.
Preferably, the first reflective surface 101 is parallel to the second reflective surface 102, so that the light beams with different wavelengths can propagate back and forth between the first reflective surface 101 and the second reflective surface 102, and the incident angle of the light beams with different wavelengths incident on the grating layer 103 can satisfy the diffraction equation of the grating layer.
Further optionally, the first reflective surface 101 may be parallel to the second reflective surface 102, the first reflective surface 101 may be parallel to the grating layer 103, a normal of any position on the first reflective surface is parallel to a normal of a corresponding position of the grating layer 103, the second reflective surface 102 is parallel to the grating layer 103, and a normal of any position on the second reflective surface 102 is parallel to a normal of a corresponding position of the grating layer 103. In specific implementation, the surface of the first reflective surface 101 may be coated with a high reflective film to increase the reflectivity, or may not be coated with a film. The surface of the second reflecting surface 102 may be coated with a high reflective film to increase the reflectivity, or may not be coated with a film.
Alternatively, output face 105 may be a planar surface, with output face 105 being perpendicular to the direction of propagation of the outgoing merged beam, which propagates through output face 105. Alternatively, output face 105 may be a curved surface that collimates the output combined beam. Preferably, an antireflection film can be plated on the surface of the output surface 105 to enable the merged light beam to be transmitted efficiently, and an antireflection film with a transmittance of 100% or an antireflection film with a transmittance of 80-90% can be plated on the output surface 105.
In one embodiment, as shown in fig. 1 and 2, the input surface 104 and the output surface 105 are both located on the side of the grating layer 103 facing the first reflective surface 101, and the light beams with different wavelengths enter the optical medium body 100 from the input surface 104 and propagate under the guiding action of the first reflective surface 101, the second reflective surface 102 and the grating layer 103 to form a combined light beam, which is output from the output surface 105. Alternatively, in other embodiments, the input surface and the output surface can be located on two sides of the grating layer, respectively, and are within the scope of the present invention.
Further, the optical medium body 100 may be a quartz medium body, a germanium medium body or a silicon medium body, and may also be a semiconductor material medium body such as GaAs, InP and the like. But is not limited to this and other optical media may be used within the scope of the invention. The working wavelength of the beam combining light source device of the embodiment can cover from ultraviolet to far infrared bands.
In a preferred embodiment, the optical medium body may include at least two grating layers, the at least two grating layers are sequentially disposed in the optical medium body and are located between the first reflecting surface and the second reflecting surface, and each beam sequentially passes through each grating layer to be diffracted each time the beam propagates from the first reflecting surface to the second reflecting surface or from the second reflecting surface to the first reflecting surface. Referring to fig. 5, fig. 5 is a schematic diagram of an optical medium body including at least two grating layers, and it can be seen that the optical medium body 300 includes an input surface 304, a first reflection surface 301, a second reflection surface 302, at least two grating layers 303 and an output surface 305, and the at least two grating layers 303 are disposed in the optical medium body 300 and are sequentially disposed between the first reflection surface 301 and the second reflection surface 302 in a layered manner.
The light beams with different wavelengths enter the optical medium body 300 from the input surface 304 and enter the grating layer 303, the first reflection surface 301 and the second reflection surface 302 enable the light beams with different wavelengths entering the grating layer 303 to propagate back and forth between the first reflection surface 301 and the second reflection surface 302 so as to guide the light beams to propagate along the length direction of the grating layer 303, and the light beams sequentially pass through the grating layer 303 to generate diffraction effect in the path that the light beams propagate from the first reflection surface 301 to the second reflection surface 302 or from the second reflection surface 302 to the first reflection surface 301 each time. The grating layer 303 is configured to diffract the light beams with different wavelengths that are incident to the grating layer 303 at each time, so that the separation distance between the light beams is reduced, the included angle between the propagation directions is reduced, and the light beams are combined into one light beam after being diffracted for a plurality of times.
In the beam combining light source device of this embodiment, each grating layer 303 can diffract the light beams with different wavelengths N times, and then assuming that the beam combining light source device includes M grating layers 303, each light beam can diffract N × M times in total, accordingly, the spectral interval of each unit light beam participating in beam combining can be compressed to 1/(N × M) of the spectral interval of each unit light beam diffracted at a time, that is, the beam combining light source device can couple N × M times of the number of unit light beams in the same spectral width range, and can increase the beam power and brightness by (N × M-1).
In practical application, the number of grating layers included in the optical medium body of the beam combining light source device of the embodiment can be flexibly set according to practical application requirements.
Therefore, the beam combination light source device can be provided with at least two grating layers in the optical medium body, each light beam participating in beam combination can be diffracted for multiple times by each grating layer, the dispersion capacity can be further improved, the wavelength interval of the unit light beams participating in beam combination can be compressed, the number of the unit light beams participating in beam combination is increased, and the beam combination power and brightness are favorably improved.
Referring to fig. 6, fig. 6 is a schematic view of a beam combining light source device according to the present embodiment. As can be seen from the figure, the beam combining light source device includes an optical medium body 400 and at least two light beam generating parts 500, and the at least two light beam generating parts 500 are respectively used for generating light beams with different wavelengths. The beam generating section 500 comprises a rear cavity surface 501 for reflecting light back into the cavity of said beam generating section 500 and a front cavity surface 502 for transmitting the generated beam.
The output surface 405 has a reflective effect on light, and is further configured to form a resonant cavity with the rear cavity surface 501 of each beam generation part 500, so as to resonate the beam generated by each beam generation part 500, and generate a beam locking wavelength for each beam generation part 500.
The beam combining light source device of the embodiment enables the incidence angle and the spectrum of the light beam generated by each light beam generating part to meet the grating diffraction equation, enables a resonant cavity to be formed between the rear cavity surface of each light beam generating part and the output surface of the optical medium body according to the geometrical optics and the diffraction optics theory, enables the light beam generated by each light beam generating part to propagate through the first reflecting surface, the second reflecting surface, the grating layer and the output surface, and forms resonance between the light beam generating part and the output surface, so that the wavelength of the light beam generated by each light beam generating part can be locked.
In a specific implementation, a highly reflective film may be coated on the rear cavity surface 501 of the light beam generating part 500 to reflect the light beam efficiently. The front cavity surface 502 of the light beam generating part 500 is coated with a high reflection reducing coating to transmit the light beam efficiently. Thus, the resonance is prevented from forming in the light beam generating part as much as possible, and the resonance is formed between the rear cavity surface of the light beam generating part and the output surface of the optical medium body as much as possible. Therefore, the beam combining light source device of the embodiment realizes external cavity feedback by arranging the external cavity reflecting surface, and can realize wavelength locking and spectrum beam combining simultaneously.
The beam combining light source device provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A beam combining light source apparatus comprising an optical medium body and at least two light beam generating portions for generating light beams of different wavelengths, respectively, the optical medium body comprising:
the input surface is used for receiving the light beams with different wavelengths and guiding the light beams to be incident to the grating layer;
the first reflecting surface and the second reflecting surface are respectively positioned at two sides of the grating layer and are used for enabling the light beams with different wavelengths entering the optical medium body to propagate back and forth between the first reflecting surface and the second reflecting surface so as to guide the light beams to propagate along the length direction of the grating layer, and the light beams are diffracted after passing through the grating layer in the path that the light beams propagate from the first reflecting surface to the second reflecting surface or from the second reflecting surface to the first reflecting surface each time;
the grating layer is arranged in the optical medium body and is used for diffracting the light beams with different wavelengths which are incident to the grating layer together every time, so that the spacing distance of the light beams is reduced, the included angle of the propagation direction is reduced, and the light beams are converged into one beam after being subjected to diffraction action for a plurality of times;
and the output surface is used for outputting the combined beam of light.
2. A combined beam source apparatus according to claim 1 wherein the input surface is curved to provide a converging effect on the beam.
3. A combined beam source apparatus according to claim 2, further comprising a collimating assembly for collimating each of the beam generating portions and directing each of the collimated beams onto the input surface.
4. A combined beam source device according to claim 1, wherein the output face is planar and perpendicular to the direction of propagation of the outgoing combined beam.
5. A combined beam source device according to claim 1 wherein the output face is curved to provide collimation to the output combined beam.
6. A combined beam source apparatus according to claim 1, wherein the first reflective surface is parallel to the second reflective surface.
7. A combined beam source device according to claim 1, wherein the refractive index of the grating layer varies periodically along the length of the grating layer.
8. A combined beam source device according to any one of claims 1-7, wherein the optical medium body comprises at least two grating layers, the at least two grating layers being arranged in sequence in the optical medium body and both being located between the first reflecting surface and the second reflecting surface, and each beam being diffracted by passing through each grating layer in sequence each time on its way from the first reflecting surface to the second reflecting surface or from the second reflecting surface to the first reflecting surface.
9. A combined beam source apparatus according to any of claims 1-7, characterised in that the beam generating part comprises a rear facet for reflecting light back into the beam generating part cavity and a front facet for transmitting the generated beam;
the output surface has a reflection effect on light and is also used for forming a resonant cavity with the rear cavity surface of each light beam generation part respectively so as to lock the wavelength of the light beam generated by each light beam generation part respectively.
10. A beam combining light source apparatus according to claim 1 wherein said optical dielectric body is a quartz dielectric body, a germanium dielectric body, a silicon dielectric body or a semiconductor material dielectric body.
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| CN113534477A (en) * | 2020-04-14 | 2021-10-22 | 蒋晶 | Optical assembly, display system and manufacturing method |
| CN114994933A (en) * | 2022-07-19 | 2022-09-02 | 中国科学院长春光学精密机械与物理研究所 | Spectrum beam combining device and method |
| CN115061286A (en) * | 2022-07-19 | 2022-09-16 | 中国科学院长春光学精密机械与物理研究所 | Spectrum beam combining device and method |
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