CN114779485A - Annular light beam generating system and device thereof - Google Patents
Annular light beam generating system and device thereof Download PDFInfo
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- CN114779485A CN114779485A CN202210331693.7A CN202210331693A CN114779485A CN 114779485 A CN114779485 A CN 114779485A CN 202210331693 A CN202210331693 A CN 202210331693A CN 114779485 A CN114779485 A CN 114779485A
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0994—Fibers, light pipes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/351—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements
- G02B6/3512—Optical coupling means having switching means involving stationary waveguides with moving interposed optical elements the optical element being reflective, e.g. mirror
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Abstract
The invention discloses an annular light beam generating system and a device thereof, comprising a laser, a cladding optical fiber circulator, a cladding optical fiber collimator, a first reflector and a core-ring energy ratio adjusting component; the laser is connected with a first port of the optical fiber circulator through a single-mode optical fiber, a second port of the optical fiber circulator is connected with a cladding optical fiber collimator through a cladding optical fiber, the first reflector is opposite to the cladding optical fiber collimator, and a second port of the optical fiber circulator is connected with the core-ring energy ratio adjusting assembly through the cladding optical fiber; the first reflector is used for reflecting the light beams emitted by the cladding optical fiber collimator back to the cladding optical fiber collimator, and the reflection angle of the first reflector can be adjusted; the center ring energy ratio adjusting component is used for adjusting the space energy ratio of the center of the light beam and the position of the outer ring. And the energy of the annular light beam can be dynamically adjusted through two-stage adjustment, the cost is low, and the generation mode is simple.
Description
Technical Field
The invention relates to the field of annular light beams, in particular to an annular light beam generating system and an annular light beam generating device.
Background
The annular light beam (hollow light beam) refers to a light beam with low or zero central light intensity in the propagation direction of the light beam, generally, the light beam is maximum in the central light front and gradually weakens along the radial direction, and is described by adopting a Gaussian model in most cases, the annular light beam has physical characteristics which are not possessed by the Gaussian light beam, such as small dark spot size and transmission invariance, and some hollow light beams also have spin and orbital angular momentum. Due to the characteristics of the hollow light beam, the hollow light beam has a swing application prospect in the fields of biomedicine, optical communication, optical sensing and the like. For example, hollow beams can be used for carrying out precise non-contact control on surrounding particles including micro-nano particles, molecules, atoms and free electrons, and can also be used for carrying out reverse operation on biological cells.
Common methods for generating annular light (hollow light beam) include transverse mode selection technology of a laser, a conical prism, an optical holographic method and a computer holographic method to realize the hollow light beam. The method has the advantages of unadjustable light beam energy, high cost and complex generation mode.
Disclosure of Invention
The invention aims to provide a ring-shaped light beam generation system and a device thereof, which have adjustable light beam energy ratio, low cost and simple generation mode.
The invention discloses an annular light beam generating system, which comprises a laser, a cladding optical fiber circulator, a cladding optical fiber collimator, a first reflector and a core-ring energy ratio adjusting assembly, wherein the laser is arranged on the cladding optical fiber circulator; the laser is connected with a first port of the optical fiber circulator through a single-mode optical fiber, a second port of the optical fiber circulator is connected with a cladding optical fiber collimator through a cladding optical fiber, the first reflector is opposite to the cladding optical fiber collimator, and a second port of the optical fiber circulator is connected with the core-ring energy ratio adjusting assembly through the cladding optical fiber;
the first reflector is used for reflecting the light beams emitted by the cladding optical fiber collimator back to the cladding optical fiber collimator, and the reflection angle of the first reflector can be adjusted; the heart ring energy ratio adjusting component is used for adjusting the space energy ratio of the center of the light beam and the position of the outer ring.
Optionally, the core ring energy ratio adjustment assembly comprises a cladding beam splitter, a single mode interference subassembly, and a coupler; the second port of the optical fiber circulator is connected with the cladding beam splitter through a cladding optical fiber; the cladding beam splitter is connected with the single-mode interference subassembly through a single-mode fiber and connected with the coupler through a cladding fiber; the single-mode interference subassembly is connected with the coupler through a single-mode optical fiber;
the cladding beam splitter divides the light beam into two beams of light, and the single-mode interference subassembly is used for adjusting the phase difference between the two beams of light; a light beam enters the single-mode interference subassembly through the single-mode optical fiber to perform phase adjustment, and then enters the coupler; the other light beam enters the coupler through the cladding optical fiber; the coupler couples the two beams.
Optionally, the single-mode interference subassembly comprises a single-mode circulator, a single-fiber collimator, and a second mirror; the first port of the single-mode circulator is connected with the cladding beam splitter through a single-mode fiber, the third port of the single-mode circulator is connected with the coupler through a single-mode fiber, the second port of the single-mode circulator is connected with the single-fiber collimator through a single-mode fiber, the second reflector is opposite to the single-fiber collimator, and the distance between the second reflector and the single-fiber collimator can be adjusted.
Optionally, the deflection angle of the mirror is θ, the core-to-cladding coupling ratio of the cladding optical fiber collimator is ρ, and the relationship between θ and ρ is:
where θ c is the divergence angle of the fiber core beam, and the mirror rotation angle 2 θ is smaller than the divergence angle of the cladding.
Optionally, the phase of the two light beams is changed to be phi, the distance between the second mirror and the single fiber collimator is L, and the relation between phi and L is:
where λ is the light source center wavelength.
Optionally, the ring beam generation system further comprises a detector, and the coupler is connected with the detector through a cladding optical fiber.
Optionally, the cladding fiber collimator is a double-cladding collimator, a lens of the double-cladding collimator is a spherical lens, the curvature of the spherical lens is 1.86mm, and the outer diameter of the spherical lens is 1.8 mm; the diameter of a fiber core, the diameter of an inner cladding, the diameter of an outer cladding and the diameter of a coating layer of the double-cladding optical fiber of the double-cladding collimator are respectively 9mm, 105mm, 125mm and 250mm, the channel isolation is 50dB, and the insertion loss of a fiber core channel is-3.3 to-2.9 dB.
Optionally, the coupler is a multi-clad fiber coupler, the diameter of a fiber core, the diameter of an inner cladding, the diameter of an outer cladding and the diameter of a coating layer of a double-clad fiber of the multi-clad fiber coupler are respectively 9mm, 105mm, 125mm and 250mm, the channel isolation is 50dB, and the insertion loss of the fiber core channel is-3.3 to-2.9 dB.
Optionally, the clad fiber circulator is a clad fiber circulator, the core diameter, the inner cladding diameter, the outer cladding diameter and the coating diameter of the clad fiber circulator are respectively 9mm, 105mm, 125mm and 250mm, and the core isolator degree is 50 dB.
The invention also discloses an annular light beam generating device which comprises the annular light beam generating system.
The annular light beam generating system can adjust the angle of the light reflected back to the cladding optical fiber collimator through the first reflector, and adjust the energy ratio of the light beam on the fiber core and the cladding in the cladding optical fiber to realize the energy adjustment of the annular light beam and complete the primary adjustment; and then the space energy ratio of the center of the light beam and the position of the outer ring is adjusted through the center-ring energy ratio adjusting assembly to finish secondary adjustment. And the energy of the annular light beam can be dynamically adjusted through two-stage adjustment, the cost is low, and the generation mode is simple.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of an annular beam generating system according to an embodiment of the invention;
FIG. 2 is a schematic illustration of beam transmission according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of first mirror angle tuning core coupling efficiency according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of first mirror angle adjusted cladding coupling efficiency according to an embodiment of the present invention.
Wherein, 1, a laser; 2. a clad fiber circulator; 3. a cladding fiber collimator; 4. a first reflecting mirror; 5. a heart ring energy ratio adjustment assembly; 51. a cladding beam splitter; 52. a single mode interference subassembly; 521. a single mode circulator; 522. a single fiber collimator; 523. a second reflector; 53. a coupler; 6. a detector; 7. a single mode optical fiber; 8. and cladding the optical fiber.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present invention may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The invention is described in detail below with reference to the figures and alternative embodiments.
As shown in fig. 1 and fig. 2, as an embodiment of the present invention, a ring beam generating system is disclosed, which includes a laser 1, a cladding fiber circulator 2, a cladding fiber collimator 3, a first mirror 4, and a core-ring energy ratio adjusting assembly 5; the laser 1 is connected with a first port of the optical fiber circulator through a single-mode optical fiber 7, a second port of the optical fiber circulator is connected with a cladding optical fiber collimator 3 through a cladding optical fiber 8, the first reflecting mirror 4 is opposite to the cladding optical fiber collimator 3, and a second port of the optical fiber circulator is connected with a core-ring energy ratio adjusting assembly 5 through the cladding optical fiber 8. The first reflector 4 is used for reflecting the light beam emitted by the cladding optical fiber collimator 3 back to the cladding optical fiber collimator 3, and the reflection angle of the first reflector 4 can be adjusted; the heart-ring energy ratio adjusting component 5 is used for adjusting the space energy ratio of the beam center and the outer ring position.
According to the annular light beam generating system, the cladding optical fiber circulator 2, the cladding optical fiber collimator 3 and the first reflector 4 are arranged, light beams enter from the first port of the cladding optical fiber circulator 2 and exit from the second port of the cladding optical fiber circulator, after passing through the cladding optical fiber collimator 3, the first reflector 4 reflects the light beams back to the cladding optical fiber collimator 3, the first reflector 4 can adjust the reflection angle, the reflection angle is adjusted through the first reflector 4, the angle of the light beams reflected back to the cladding optical fiber collimator 3 can be adjusted, and the adjustment of the energy ratio of the light beams on a fiber core and a cladding in the cladding optical fiber 8 is achieved. Then, the adjusted light beam enters the cladding optical fiber circulator 2 from the second port of the optical fiber circulator, is transmitted to the core-ring energy ratio adjusting assembly 5 from the third port of the cladding optical fiber circulator 2, and is subjected to adjustment of the spatial energy ratio of the center and the outer ring of the light beam by the core-ring energy ratio adjusting assembly 5, so that the annular light beam is finally obtained.
The annular light beam generating system can adjust the angle of the light reflected back to the cladding optical fiber collimator 3 through the first reflector 4, adjust the energy ratio of the light beam on the fiber core and the cladding in the cladding optical fiber 8, realize the energy adjustment of the annular light beam and complete the primary adjustment; and then the space energy ratio of the center of the light beam and the position of the outer ring is adjusted through the center-ring energy ratio adjusting component 5, so that secondary adjustment is completed. And the energy of the annular light beam can be dynamically adjusted through two-stage adjustment, the cost is low, and the generation mode is simple.
In addition, the cladding optical fiber circulator 2 is adopted to realize unidirectional light guiding, and the interference of an interference system is avoided. Specifically, as shown in fig. 3 and 4, the first reflecting mirror 4 can adjust the reflection angle left and right and in pitch, so as to adjust the energy ratio between the core and the cladding.
Optionally, the core-ring energy ratio adjustment assembly 5 comprises a cladding beam splitter 51, a single-mode interference subassembly 52, and a coupler 53; the port of the optical fiber circulator is connected with a cladding beam splitter 51 through a cladding optical fiber 8; the cladding beam splitter 51 is connected to the single-mode interference subassembly 52 via the single-mode fiber 7 and to the coupler 53 via the cladding fiber 8; single mode interference subassembly 52 is connected to coupler 53 by single mode fiber 7. The cladding beam splitter 51 splits the beam into two beams, and the single mode interference subassembly 52 is used to adjust the phase difference between the two beams; a light beam enters the single-mode interference subassembly 52 through the single-mode fiber 7 for phase adjustment, and then enters the coupler 53; the other beam enters the coupler 53 through the cladding fiber 8; the coupler 53 couples the two beams.
In the scheme, the light beam is divided into two beams by the cladding beam splitter 51, wherein one beam is stripped of the cladding light of the light beam by the single-mode fiber 7, only the fiber core light is left, after the phase adjustment is carried out on the fiber core light by the single-mode interference subassembly 52, the other beam is normally transmitted, the two beams are coupled by the coupler 53, after the phase adjustment is carried out on one beam by the single-mode interference subassembly 52, the spatial energy ratio adjustment of the beam center and the outer ring position is realized after the two beams are combined.
Optionally, single-mode interference subassembly 52 includes single-mode circulator 521, single-fiber collimator 522, and second mirror 523; the first port of the single-mode circulator 521 is connected with the cladding beam splitter 51 through a single-mode fiber 7, the third port of the single-mode circulator 521 is connected with the coupler 53 through the single-mode fiber 7, the third port of the single-mode circulator 521 is connected with a single-fiber collimator 522 through the single-mode fiber 7, the second reflector 523 is opposite to the single-fiber collimator 522, and the second reflector 523 can adjust the distance between the single-fiber collimator 522 and the distance between the second reflector 523 and the single-fiber collimator 522. In this embodiment, the phase difference between the interference arms is changed by adjusting the distance between the second reflecting mirror 523 and the single-fiber collimator 522, so as to adjust the phase difference between the two beams, and realize the spatial energy ratio between the center of the beam and the outer ring, thereby realizing the energy adjustment of the ring beam. The single-mode transmission and phase debugging system can further filter the cladding light and ensure the output accuracy of the cladding light. The single-mode circulator 521 realizes unidirectional light guiding, and avoids interference of an interference system. And the connection of the cladding fiber 8 and the single mode fiber 7 can strip the cladding fiber energy and only transmit the core energy.
Specifically, within a certain range, the distance between the second reflector and the single-fiber collimator is increased, the phase difference between the two beams is increased, the energy of the beams is reduced, and the adjustment of the distance is periodic.
Optionally, the mirror deflection angle is θ, the core-cladding coupling ratio of the cladding fiber collimator 3 is ρ, and the relationship between θ and ρ is:
where θ c is the divergence angle of the fiber core beam, and the mirror rotation angle 2 θ is smaller than the divergence angle of the cladding.
Alternatively, the phase of the two light beams is changed to be phi, the distance between the second mirror 523 and the single fiber collimator 522 is L, and the relationship between phi and L is:
where λ is the light source center wavelength.
Optionally, the ring beam generation system further comprises a detector 6, and the coupler 53 is connected to the detector 6 by a cladding fiber 8. The detector 6 may be a detector 6 of a C-band. Optionally, the light source of the laser 1 can be a narrow-band light source with a C-band and a bandwidth of 0.5-1 n.
Optionally, the cladding fiber collimator 3 is a double-cladding collimator, a lens of the double-cladding collimator is a spherical lens (C-lens), the curvature of the spherical lens is 1.86mm, and the outer diameter is 1.8 mm; the diameter of a fiber core, the diameter of an inner cladding, the diameter of an outer cladding and the diameter of a coating layer of a double-clad optical fiber 8 of the double-clad collimator are respectively 9mm, 105mm, 125mm and 250mm, the channel isolation is 50dB, and the insertion loss of a fiber core channel is-3.3 to-2.9 dB.
Optionally, the coupler 53 is a multi-clad fiber 8 coupler 53, the core diameter, the inner cladding diameter, the outer cladding diameter, and the coating diameter of the double-clad fiber 8 of the multi-clad fiber 8 coupler 53 are respectively 9mm, 105mm, 125mm, and 250mm, the channel isolation is 50dB, and the core channel insertion loss is-3.3 to-2.9 dB.
Optionally, the cladding optical fiber circulator 2 is a cladding optical fiber circulator 2, the core diameter, the inner cladding diameter, the outer cladding diameter, and the coating diameter of the cladding optical fiber circulator 2 are 9mm, 105mm, 125mm, and 250mm, respectively, and the core isolator degree is 50 dB. The cladding optical fiber circulator 2 selects core and cladding alignment light splitting cladding coupling, and the applicable wave band comprises C-band; the single mode optical fiber 7 may be SM-28 e.
Specifically, as shown in fig. 2, a laser beam emitted by a narrow-band light source of a laser 1 passes through a single-mode fiber 7 to a cladding fiber circulator 2, and then is transmitted to a cladding fiber collimator 3 and a reflector to combine and complete core and cladding light energy modulation, the core and cladding energy is transmitted to a cladding beam splitter 51 to be divided into two beams of light, wherein one beam of light passes through a second reflector 523 to complete adjustment of phase difference of two paths, and the cladding light is synchronously stripped; the other beam of light core and the other beam of light cladding are transmitted unchanged, the two beams of light are combined through the coupler 53, and the coherence of the core light is realized through the adjusted phase difference.
As another embodiment of the present invention, there is disclosed an annular beam generating apparatus including the annular beam generating system as described above.
The foregoing is a further detailed description of the invention in connection with specific alternative embodiments and is not intended to limit the invention to the specific embodiments described herein. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.
Claims (10)
1. The annular light beam generation system is characterized by comprising a laser, a cladding optical fiber circulator, a cladding optical fiber collimator, a first reflector and a core-ring energy ratio adjusting assembly; the laser is connected with a first port of the optical fiber circulator through a single-mode optical fiber, a second port of the optical fiber circulator is connected with the cladding optical fiber collimator through a cladding optical fiber, the first reflector is opposite to the cladding optical fiber collimator, and a second port of the optical fiber circulator is connected with the core ring energy ratio adjusting assembly through a cladding optical fiber;
the first reflecting mirror is used for reflecting the light beam emitted by the cladding optical fiber collimator back to the cladding optical fiber collimator, and the reflecting angle of the first reflecting mirror can be adjusted; the center-to-ring energy ratio adjusting component is used for adjusting the spatial energy ratio of the center and the outer ring of the light beam.
2. The annular beam generating system of claim 1, wherein the core-to-ring energy ratio adjustment assembly comprises a cladding beam splitter, a single-mode interference subassembly, and a coupler; a second port of the optical fiber circulator is connected with the cladding beam splitter through cladding optical fibers; the cladding beam splitter is connected with the single-mode interference subassembly through a single-mode optical fiber and connected with the coupler through a cladding optical fiber; the single-mode interference subassembly is connected with the coupler through a single-mode optical fiber;
the cladding beam splitter divides the light beam into two beams of light, and the single-mode interference subassembly is used for adjusting the phase difference between the two beams of light; a light beam enters the single-mode interference subassembly through a single-mode optical fiber to perform phase adjustment, and then enters the coupler; another light beam enters the coupler through a cladding fiber; the coupler couples the two beams of light.
3. The annular beam generating system of claim 2, wherein the single-mode interference subassembly comprises a single-mode circulator, a single-fiber collimator, and a second mirror; the port of single mode circulator one through single mode fiber with the cladding beam splitter is connected, the port of single mode circulator three through single mode fiber with the coupler is connected, the port of single mode circulator two through single mode fiber with the single fiber collimator is connected, the second mirror with the single fiber collimator opposition, the second mirror adjustable with distance between the single fiber collimator.
4. An annular beam generating system as claimed in any of claims 1 to 3 wherein the mirror deflection angle is θ, the core to cladding coupling ratio of the cladding optical fiber collimator is ρ, and θ and ρ are related by:
wherein, thetacThe divergence angle of the fiber core light beam is shown, and the reflector rotation angle 2 theta is smaller than the divergence angle of the cladding.
5. The annular beam generating system of claim 3, wherein the two beams change phase by Φ, the second mirror is spaced from the single fiber collimator by L, and the relationship between Φ and L is:
where λ is the light source center wavelength.
6. The annular beam generating system of claim 3, further comprising a detector, wherein the coupler is coupled to the detector via a clad fiber.
7. The annular beam generating system of claim 1, wherein the cladding fiber collimator is a double-cladding collimator, the lens of the double-cladding collimator is a spherical lens, the spherical lens has a curvature of 1.86mm and an outer diameter of 1.8 mm; the diameter of a fiber core, the diameter of an inner cladding, the diameter of an outer cladding and the diameter of a coating layer of the double-cladding optical fiber of the double-cladding collimator are respectively 9mm, 105mm, 125mm and 250mm, the channel isolation is 50dB, and the insertion loss of a fiber core channel is-3.3 to-2.9 dB.
8. The ring beam generation system of claim 2, wherein the coupler is a multi-clad fiber coupler, the core diameter, the inner cladding diameter, the outer cladding diameter, and the coating diameter of the double-clad fiber of the multi-clad fiber coupler are respectively 9mm, 105mm, 125mm, and 250mm, the channel isolation is 50dB, and the core channel insertion loss is-3.3 to-2.9 dB.
9. The ring beam generation system of claim 1, wherein the clad fiber circulator is a clad fiber circulator having a core diameter, an inner cladding diameter, an outer cladding diameter, and a coating diameter of 9mm, 105mm, 125mm, and 250mm, respectively, and a core isolator degree of 50 dB.
10. An annular beam generating apparatus comprising the annular beam generating system of any of claims 1 to 9.
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| CN114779485B (en) | 2023-08-29 |
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