CN110908214A - Full optical fiber bright compressed state light field generating device - Google Patents
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 27
- 239000013078 crystal Substances 0.000 claims abstract description 80
- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000002310 reflectometry Methods 0.000 claims description 8
- 230000010287 polarization Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 4
- WYOHGPUPVHHUGO-UHFFFAOYSA-K potassium;oxygen(2-);titanium(4+);phosphate Chemical compound [O-2].[K+].[Ti+4].[O-]P([O-])([O-])=O WYOHGPUPVHHUGO-UHFFFAOYSA-K 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005610 quantum mechanics Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3551—Crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3558—Poled materials, e.g. with periodic poling; Fabrication of domain inverted structures, e.g. for quasi-phase-matching [QPM]
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/365—Non-linear optics in an optical waveguide structure
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/395—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves in optical waveguides
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/392—Parametric amplification
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- General Physics & Mathematics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses an all-fiber bright compressed-state light field generating device which comprises a low-noise single-frequency laser, a 10:90 coupler, a first block of periodically polarized nonlinear crystal waveguide, an frequency doubling light transmission fiber, a fundamental frequency light filter, a second block of periodically polarized nonlinear crystal waveguide, a 0.1:99.9 coupler, a phase controller and an optical parametric amplifier. The invention prepares the full optical fiber bright compression state in the waveguide by using the method of reversely injecting the seed light, and thoroughly avoids the problems of mode matching, mode locking and the like caused by an optical parametric oscillator; the structure is compact, and the volume is small; the control device is simple and reliable, and the light path does not need to be matched and adjusted; the anti-interference capability is strong; the system structure of the all-fiber is beneficial to matching of a back-end application system. The invention can be widely applied to the field of light field generating devices.
Description
Technical Field
The invention relates to an optical field generating device, in particular to an all-fiber bright compressed optical field generating device.
Background
The noise of the laser is divided into classical noise and quantum noise, wherein the classical noise can be suppressed by corresponding technical means. While quantum noise is an intrinsic property of laser light and cannot be suppressed by classical means. Under the premise of not violating quantum mechanics principle, the compression state redistributes the symmetrically distributed orthogonal noise components to make one of the noise components lower than quantum noise limit and the other noise component higher than quantum noise limit correspondingly.
The compressed light source based on the space optical system has the advantages of high compression degree, low transmission loss and the like. But the further application is limited by the defects of complex structure, poor interference resistance and the like. In all-fiber systems, ensuring a perfect matching of the modes with the fundamental mode of a single-mode fiber is one of the ways to solve this problem.
Disclosure of Invention
To solve at least one of the above-mentioned technical problems, the present invention is directed to: an apparatus for generating orthogonal brightly compressed optical fields in an all-fiber system using a crystal waveguide is provided.
The embodiment of the invention provides:
an all-fiber brightly compressed light field generating device, comprising: the system comprises a low-noise single-frequency laser, a 10:90 coupler, a first periodically-polarized nonlinear crystal waveguide, an frequency doubling optical transmission fiber, a fundamental frequency optical filter, a second periodically-polarized nonlinear crystal waveguide, a 0.1:99.9 coupler, a phase controller and an optical parametric amplifier;
wherein, the output end of the low-noise single-frequency laser is connected with the input end of the 10:90 coupler; the small end of the output end of the 10:90 coupler is connected with the input end of the phase controller, and the large end of the output end of the 10:90 coupler is connected with the input end of the first block of periodically-polarized nonlinear crystal waveguide; the output end of the first periodically-polarized nonlinear crystal waveguide is connected with the input end of the fundamental frequency optical filter through an frequency doubling optical transmission fiber; the output end of the fundamental frequency optical filter is connected with the input end of the second periodically polarized nonlinear crystal waveguide; the output end of the second block of the periodic polarization nonlinear crystal waveguide is connected with the input end of the 0.1:99.9 coupler to form an optical parametric amplifier; the output end of the phase controller is connected with the small end of the output end of the 0.1:99.9 coupler so as to reversely inject the seed light into the optical parametric amplifier; the output of the 0.1:99.9 coupler serves as the final output port.
Further, the low-noise single-frequency laser is a continuous single-frequency fiber laser or a single-frequency semiconductor laser, and the output power of the low-noise single-frequency laser is greater than 1W; the output wavelength of the low-noise single-frequency laser is 1.0 mu m, 1.5 mu m or 2.0 mu m wave band.
Further, the intensity noise of the low-noise single-frequency laser reaches the quantum noise limit within the frequency band range of more than 500 kHz.
Further, the crystal material used by the first periodically poled nonlinear crystal waveguide and the second periodically poled nonlinear crystal waveguide is periodically poled lithium niobate crystal or periodically poled potassium titanyl phosphate, and the waveguide structure is a ridge waveguide etched on the crystal surface; the polarization period of the crystal material corresponds to the second harmonic process of the fundamental frequency light, and the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide are both internally provided with a temperature control module.
Further, the optical fiber comprises a plurality of single mode optical fibers; the mode fields of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide and the mode field diameter of a single-mode optical fiber used in the device are both smaller than 10 mu m; the input end and the output end of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide are both directly coupled with optical fibers by micro lenses, and the types of the used optical fibers are single-mode polarization-maintaining optical fibers corresponding to fundamental frequency light and frequency doubling light respectively.
Further, the incident end of the second periodically-polarized nonlinear crystal waveguide is plated with a fundamental frequency light high-reflection film, and the reflectivity R of the fundamental frequency light high-reflection film is greater than 99.9%.
Further, the emergent end of the second periodically-polarized nonlinear crystal waveguide is plated with a frequency doubling light high-reflection film, and the reflectivity R of the frequency doubling light high-reflection film is greater than 99.9%.
Further, the insertion loss of the 0.1:99.9 coupler is less than 0.3dB, and the error of the two-arm splitting ratio of the 0.1:99.9 coupler is not more than +/-0.5%.
Furthermore, the filtering depth of the fundamental frequency light filter to the fundamental frequency light is larger than 60dB, and the loss to the frequency doubling light is smaller than 1 dB.
Further, the frequency doubling optical transmission fiber supports single-mode polarization-preserving transmission of frequency doubling light, and the mode field diameter of the frequency doubling optical transmission fiber is smaller than the mode field diameters of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide.
The embodiment of the invention has the beneficial effects that: a bright compression state is prepared in the waveguide by utilizing a method of reversely injecting seed light, so that the problems of mode matching, mode locking and the like caused by an optical parametric oscillator are thoroughly avoided; the structure is compact, and the volume is small; the control device is simple and reliable, and the light path does not need to be matched and adjusted; the anti-interference capability is strong; the system structure of the all-fiber is beneficial to matching of a back-end application system.
Drawings
FIG. 1 is a schematic structural diagram of an all-fiber bright compressed-state optical field generating device based on a nonlinear crystal waveguide according to an embodiment of the present invention;
FIG. 2 is a side view of a second block of periodically poled nonlinear crystal waveguide shown in FIG. 1;
fig. 3 is a cross-sectional view of the second block of periodically poled nonlinear crystal waveguides shown in fig. 1.
Reference numerals: 1-low noise single frequency laser, 2-10: 90 coupler, 3-first block periodic polarization nonlinear crystal waveguide, 4-frequency doubling optical transmission fiber, 5-fundamental frequency optical filter, 6-second block periodic polarization nonlinear crystal waveguide, 7-0.1: 99.9 coupler, 8-phase controller, 9-optical parametric amplifier, 10-incident end fiber, 11-emergent end fiber, 12-microlens, 13-fundamental frequency optical high reflection film, 14-frequency doubling optical high reflection film, 15-ridge waveguide, and 16-TEC temperature control.
Detailed Description
The invention is further described with reference to the drawings and the specific examples.
As shown in fig. 1, the present embodiment includes the following components: the device comprises a low-noise single-frequency laser 1, a 10:90 coupler 2, a first periodically-polarized nonlinear crystal waveguide 3, an frequency doubling optical transmission fiber 4, a fundamental frequency optical filter 5, a second periodically-polarized nonlinear crystal waveguide 6, a 1:999 coupler 7, a phase controller 8 and an optical parametric amplifier 9.
The low-noise single-frequency laser 1 used in this embodiment is a 1550nm low-noise single-frequency fiber laser, and is divided into two paths of laser with a power ratio of 10:90 by a 10:90 coupler 2, which are respectively named as a path of laser a and a path of laser B. The path A laser is seed light needed for preparing a compressed optical field, the seed light passes through a phase controller 8 and is reversely injected into the second periodically-polarized nonlinear crystal waveguide 6 through a 0.1:99.9 coupler 7, and finally the power input into the second periodically-polarized nonlinear crystal waveguide 6 is about 10 mu W. The first periodically poled nonlinear crystal waveguide 3 and the second periodically poled nonlinear crystal waveguide 6 used in the present embodiment are both periodically poled lithium niobate (i.e., PPLN) waveguides; the B-channel laser generates an octave light (λ ═ 775nm) as a fundamental frequency light (λ ═ 1550nm) through the first block of periodically poled nonlinear crystal waveguide 3 by a second harmonic process. After the residual 1550nm fundamental frequency light is filtered by the fundamental frequency light filter 5, the filtered light is injected into the second periodically-polarized nonlinear crystal waveguide 6 to be used as pump light prepared in a compressed state. In this embodiment, the fundamental frequency optical filter 5 is a fiber ring with a diameter of 3cm, and a single-mode polarization-maintaining 780 fiber can be used.
The second periodically poled nonlinear crystal waveguide 6 in this embodiment is structured as shown in fig. 2 and 3. The input light is coupled into the ridge waveguide 15 by the micro lens 12 on the end face of the incident end optical fiber 10, and the output light is coupled into the emergent end optical fiber 11 by the micro lens. The waveguide end face has a special coating design, the incident end face is coated with a fundamental frequency light high reflection film 13, wherein the reflectivity R of the fundamental frequency light high reflection film is more than 99.9%, the emergent end coating face is provided with a frequency doubling light high reflection film 14, and the reflectivity R of the frequency doubling light high reflection film is more than 99.9%. The quasi-phase matching process within the waveguide is controlled by an embedded TEC temperature control 16. 775nm frequency doubling light is injected into the ridge waveguide 15 as pumping light from the incident end optical fiber 10, and is reflected backwards and filtered by the frequency doubling high reflection film 14. The 1550nm seed light is injected backward into the ridge waveguide 15 through the exit end optical fiber 11 through the small end (port with a splitting ratio of 0.1%) of the 0.1:99.9 coupler 7, and is reflected by the fundamental frequency light high reflection film 13 and then propagates forward. The relative phase between the two beams is controlled by a phase controller 8. The seed light and the pump light generate bright compressed light through an optical parametric process in the second periodically-polarized nonlinear crystal waveguide 6, and the bright compressed light is emitted out of the waveguide and finally output through a large end (a port with a splitting ratio of 99.9%) of a 0.1:99.9 coupler 7.
Compared with the compressed state light field generation device with a spatial structure, the technical effects of the embodiment are as follows: the method of reversely injecting seed light is used for preparing a bright compression state in the waveguide, and the problems of mode matching, mode locking and the like caused by an optical parametric oscillator are thoroughly avoided. The structure is compact, and the volume is small; the control device is simple and reliable, and the light path does not need to be matched and adjusted; the anti-interference capability is strong; the system structure of the all-fiber is beneficial to matching of a back-end application system. In conclusion, the all-fiber bright compressed-state light field generation device is expected to enable the compressed-state light field to be widely applied to basic scientific research and engineering application. The advantages of the nonlinear crystal waveguide and the all-fiber system are combined, so that a preparation device of a bright compressed optical field can be simplified, and the reliability of the preparation device is improved. Has important significance for further application in the fields of quantum sensing, quantum radar, quantum imaging, quantum information, quantum computing and the like.
As a preferred embodiment, the low-noise single-frequency laser is a continuous single-frequency fiber laser or a single-frequency semiconductor laser, and the output power of the low-noise single-frequency laser is greater than 1W; the output wavelength of the low-noise single-frequency laser is 1.0 mu m, 1.5 mu m or 2.0 mu m wave band. A continuous single frequency fibre laser with an output wavelength of 1550nm is preferably chosen.
As a preferred embodiment, the intensity noise of the low-noise single-frequency laser reaches the quantum noise limit within the frequency band range of more than 500kHz, and the influence on the compression degree of the finally generated compressed optical field caused by the introduction of extra noise in the frequency band above 500kHz is avoided.
As a preferred embodiment, the crystal material used by the first periodically poled nonlinear crystal waveguide and the second periodically poled nonlinear crystal waveguide is periodically poled lithium niobate crystal or periodically poled potassium titanyl phosphate, and the waveguide structure is a ridge waveguide etched on the crystal surface; the polarization period of the crystal material corresponds to the second harmonic process of the fundamental frequency light, and the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide are both internally provided with a temperature control module.
As a preferred embodiment, the fiber bundle further comprises a plurality of single mode fibers; the mode fields of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide and the mode field diameter of a single-mode optical fiber used in the device are both smaller than 10 mu m; the input end and the output end of the first block of periodically-polarized nonlinear crystal waveguide and the second block of periodically-polarized nonlinear crystal waveguide are both directly coupled with optical fibers by micro lenses, and the types of the used optical fibers are single-mode polarization-maintaining optical fibers corresponding to fundamental frequency light (frequency f is omega) and frequency doubling light (frequency f is 2 omega) respectively. In particular, single mode polarization-maintaining 1550 optical fiber and single mode polarization-maintaining 780 optical fiber may be employed.
In a preferred embodiment, the incident end of the second periodically-polarized nonlinear crystal waveguide is plated with a fundamental frequency light high-reflection film, and the reflectivity R of the fundamental frequency light high-reflection film is greater than 99.9%. The design of the reflecting film can increase the filtering depth of the fundamental frequency light and prevent the previous-stage fundamental frequency light from entering the optical parametric amplifier. Meanwhile, since the common frequency doubling optical transmission fiber does not support the fundamental mode transmission of the fundamental frequency light, the seed light cannot be injected into the nonlinear crystal in the same direction as the pump light in the form of the fundamental mode. In this embodiment, the seed light is injected backward through the small end of the 0.1:99.9 coupler via the exit end of the waveguide, and is reflected and propagated forward through the incident end-frequency optical highly reflective film of the waveguide. In this embodiment, the seed light is injected into the nonlinear medium in the form of the fundamental mode while introducing only a small transmission loss, which is about 1 ‰.
In a preferred embodiment, the exit end of the second periodically-polarized nonlinear crystal waveguide is plated with an optical frequency doubling high-reflection film, and the reflectivity R of the optical frequency doubling high-reflection film is greater than 99.9%. The frequency doubling light is used as pumping light and injected into the waveguide from the input end, and is reflected backwards by the high-reflection film at the emergent end and filtered, so that the loss of the compressed light possibly caused by the subsequent inserted filter is avoided.
As a preferred embodiment, the insertion loss of the 0.1:99.9 coupler is less than 0.3dB, and the two-arm splitting ratio error of the 0.1:99.9 coupler is not more than +/-0.5%. As an output device of the compressed optical field, the insertion loss of the coupler is reduced, so that the compression degree of the finally prepared compressed optical field is effectively improved.
In a preferred embodiment, the fundamental frequency optical filter is a single-mode polarization-maintaining 780 optical fiber ring with a diameter of 3cm, and the filtering depth of the fundamental frequency optical filter is greater than 60dB, and the loss of the octave optical filter is less than 1 dB. The filtering depth of the fundamental frequency light is large enough, so that the number of the fundamental frequency light photons mixed into the finally generated compressed optical field can be effectively reduced, and the influence of the fundamental frequency light on the compression degree of the compressed optical field is avoided.
As a preferred embodiment, the frequency doubling optical transmission fiber supports single-mode polarization-maintaining transmission of 780nm laser, and a mode field diameter of the frequency doubling optical transmission fiber is smaller than mode field diameters of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An all-fiber bright compressed-state light field generating device is characterized in that: the system comprises a low-noise single-frequency laser, a 10:90 coupler, a first periodically-polarized nonlinear crystal waveguide, an frequency doubling optical transmission fiber, a fundamental frequency optical filter, a second periodically-polarized nonlinear crystal waveguide, a 0.1:99.9 coupler, a phase controller and an optical parametric amplifier;
wherein, the output end of the low-noise single-frequency laser is connected with the input end of the 10:90 coupler; the small end of the output end of the 10:90 coupler is connected with the input end of the phase controller, and the large end of the output end of the 10:90 coupler is connected with the input end of the first block of periodically-polarized nonlinear crystal waveguide; the output end of the first periodically-polarized nonlinear crystal waveguide is connected with the input end of the fundamental frequency optical filter through an frequency doubling optical transmission fiber; the output end of the fundamental frequency optical filter is connected with the input end of the second periodically polarized nonlinear crystal waveguide; the output end of the second block of the periodic polarization nonlinear crystal waveguide is connected with the input end of the 0.1:99.9 coupler to form an optical parametric amplifier; the output end of the phase controller is connected with the small end of the output end of the 0.1:99.9 coupler so as to reversely inject the seed light into the optical parametric amplifier; the output of the 0.1:99.9 coupler serves as the final output port.
2. The all-fiber bright compressed-state light field generating device according to claim 1, wherein: the low-noise single-frequency laser is a continuous single-frequency optical fiber laser or a single-frequency semiconductor laser, and the output power of the low-noise single-frequency laser is greater than 1W; the output wavelength of the low-noise single-frequency laser is 1.0 mu m, 1.5 mu m or 2.0 mu m wave band.
3. The all-fiber bright compressed-state light field generating device according to claim 1, wherein: the intensity noise of the low-noise single-frequency laser reaches the quantum noise limit within the frequency band range of more than 500 kHz.
4. The all-fiber bright compressed-state light field generating device according to claim 1, wherein: the crystal material used by the first periodically poled nonlinear crystal waveguide and the second periodically poled nonlinear crystal waveguide is periodically poled lithium niobate crystal or periodically poled potassium titanyl phosphate, and the waveguide structure is a ridge waveguide etched on the crystal surface; the polarization period of the crystal material corresponds to the second harmonic process of the fundamental frequency light, and the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide are both internally provided with a temperature control module.
5. The all-fiber bright compressed-state light field generating device according to claim 1, wherein: the optical fiber comprises a plurality of single mode optical fibers; the mode fields of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide and the mode field diameter of a single-mode optical fiber used in the device are both smaller than 10 mu m; the input end and the output end of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide are both directly coupled with optical fibers by micro lenses, and the types of the used optical fibers are single-mode polarization-maintaining optical fibers corresponding to fundamental frequency light and frequency doubling light respectively.
6. The all-fiber bright compressed-state light field generating device according to claim 1, wherein: and the incident end of the second periodically-polarized nonlinear crystal waveguide is plated with a fundamental frequency light high-reflection film, and the reflectivity R of the fundamental frequency light high-reflection film is more than 99.9%.
7. The all-fiber bright compressed-state light field generating device according to claim 1, wherein: the emergent end of the second periodically-polarized nonlinear crystal waveguide is plated with a frequency doubling light high-reflection film, and the reflectivity R of the frequency doubling light high-reflection film is more than 99.9%.
8. An all-fiber brightly compressed light field generating device as claimed in any one of claims 1 to 7, wherein: the insertion loss of the 0.1:99.9 coupler is less than 0.3dB, and the error of the two-arm splitting ratio of the 0.1:99.9 coupler is not more than +/-0.5%.
9. An all-fiber brightly compressed light field generating device as claimed in any one of claims 1 to 7, wherein: the filtering depth of the fundamental frequency light filter to the fundamental frequency light is larger than 60dB, and the loss to the frequency doubling light is smaller than 1 dB.
10. An all-fiber brightly compressed light field generating device as claimed in any one of claims 1 to 7, wherein: the frequency doubling light transmission fiber supports single-mode polarization-preserving transmission of frequency doubling light, and the mode field diameter of the frequency doubling light transmission fiber is smaller than the mode field diameters of the first periodically-polarized nonlinear crystal waveguide and the second periodically-polarized nonlinear crystal waveguide.
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| CN114361922A (en) * | 2021-12-17 | 2022-04-15 | 济南量子技术研究院 | All-fiber bright compressed light source based on optical parameter down-conversion |
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| JOJI MAEDA: "Bright squeezing by singly resonant second-harmonic generation: effect of fundamental depletion and feedback", 《OPTICS LETTERS》 * |
| K.SCHNEIDER等: "Bright squeezed-light generation by a continuous-wave semimonolithic parametric amplifier", 《OPTICS LETTERS》 * |
| MATT T.SIMONS等: "Bright squeezed light via second harmonic generation in a whispering-gallery mode resonator", 《SPIE》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114361922A (en) * | 2021-12-17 | 2022-04-15 | 济南量子技术研究院 | All-fiber bright compressed light source based on optical parameter down-conversion |
| CN114361922B (en) * | 2021-12-17 | 2024-09-06 | 济南量子技术研究院 | All-fiber bright compressed state light source based on optical parameter down-conversion |
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| CN110908214B (en) | 2021-04-06 |
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