Laser frequency stabilization module and system

Abstract

The utility model provides a laser frequency stabilization module and system, the module comprises a frequency stabilization module box, an optical fiber path and an optical fiber path, the input end of the optical fiber path is connected with laser to be subjected to frequency stabilization, the first output end of the optical fiber path is connected with the first input end of the optical fiber path, and the second output end of the optical fiber path is connected with the second input end of the optical fiber path. The output end of the optical fiber path is connected with the photoelectric detection assembly, and the photoelectric detection assembly outputs a detection signal; the polarization maintaining optical fiber beam splitter, the optical fiber electro-optical modulator, the first optical fiber collimator, the half-wave plate assembly, the cylindrical rubidium Rb87 atomic gas chamber, the polarization splitting prism, the second optical fiber collimator and the photoelectric detection assembly are sequentially arranged in the frequency stabilization module box. The input end of the polarization-maintaining optical fiber beam splitter is connected with laser to be subjected to frequency stabilization, the first output end of the polarization-maintaining optical fiber beam splitter is connected with the input end of the optical fiber electro-optical modulator, the output end of the optical fiber electro-optical modulator is connected with the first optical fiber collimator, and the second output end of the polarization-maintaining optical fiber beam splitter is connected with the second optical fiber collimator.

Description

Technical Field

[0001] The utility model relates to the field of quantum optoelectronic technology, in particular to a laser frequency stabilization module and system. Background Art

[0002] The interaction between lasers and atoms can manipulate the matter waves of atoms to converge and interfere after passing through different space-time paths. The technology of using laser beams of special frequencies to manipulate atoms has become a key technology for various cold atom interferometer devices.

[0003] Stable and precise control of the manipulation laser frequency is a prerequisite for atomic cooling and interference. Alkali metal atoms Rb 87 It has a typical dual-level structure, and the corresponding hyperfine energy levels will be split during the cold atom interference process. When one or more laser beams with frequencies that resonate with the transition frequency of a hyperfine energy level of the rubidium atom interact with it, the internal state of the atom will change, giving it corresponding physical properties. Based on this principle, a laser system with frequency controllable function can be designed to change the spatial distribution and internal state of atoms, thereby achieving the purpose of manipulating atoms.

[0004] In the laser scheme of cold atom interferometer, Rb is usually used 87 The transition energy level characteristics of Rb 87 The 780nm transition spectrum line provides an absolute frequency reference for the laser system; then different frequency control technologies are used on this basis.

[0005] Frequency stabilization technologies mainly include saturated absorption spectroscopy (SAS), Sagnac interferometry, dichroic atomic vapor laser locking (DAVLL), polarization spectroscopy, frequency modulation spectroscopy (FMS), modulation transfer spectroscopy (MTS), etc. Among them, modulation transfer spectroscopy (MTS) technology, which has the advantages of accurate frequency setting point and high error signal slope, is widely favored.

[0006] Existing modulation transfer spectroscopy (MTS) laser frequency stabilization solutions are mostly spatial optical path modulation, which is constructed by a variety of optical components and mechanical adjustment mounts. The optical path is difficult to install and adjust, has a large size and low reliability. Utility Model Content

[0007] The utility model embodiment provides a laser frequency stabilization module and system, which can provide a laser frequency stabilization module based on modulation transfer spectroscopy (MTS) technology, which is used to receive the laser to be stabilized of the fiber laser and the modulation signal of the MTS frequency stabilization circuit, and output a detection signal, and after being processed by the MTS frequency stabilization circuit, a real-time stable control signal for modulating the output frequency of the fiber laser is generated; the frequency stabilization box of the utility model module includes a polarization-maintaining fiber beam splitter, a first fiber collimator, a polarization beam splitter prism, a rubidium Rb 87Atomic gas chamber, half wave plate assembly, second optical fiber collimator, photoelectric detection assembly, electro-optic modulator and other devices; the utility model module has high integration, miniaturization, easy installation and adjustment, high reliability, and can achieve long-term stable frequency stabilization of laser.

[0008] The utility model embodiment provides a laser frequency stabilization module, the laser frequency stabilization module comprises a frequency stabilization module box, an optical fiber path and an optical fiber path, the input end of the optical fiber path is connected to the laser to be frequency stabilized, the first output end of the optical fiber path is connected to the first input end of the optical fiber path, the second output end of the optical fiber path is connected to the second input end of the optical fiber path, the output end of the optical fiber path is connected to a photoelectric detection component, and the photoelectric detection component outputs a detection signal;

[0009] The polarization-maintaining optical fiber beam splitter, the optical fiber electro-optic modulator, the first optical fiber collimator, the half-wave plate assembly, the cylindrical rubidium Rb 87 Atomic gas chamber, polarization beam splitter prism, second optical fiber collimator, photoelectric detection assembly;

[0010] The input end of the polarization-maintaining fiber beam splitter is connected to the laser to be frequency-stabilized, the first output end of the polarization-maintaining fiber beam splitter is connected to the input end of the fiber electro-optic modulator, the output end of the fiber electro-optic modulator is connected to the first fiber collimator, and the second output end of the polarization-maintaining fiber beam splitter is connected to the second fiber collimator.

[0011] Optionally, the optical fiber path includes a polarization-maintaining fiber beam splitter, an optical fiber electro-optic modulator, a first optical fiber collimator, and a second optical fiber collimator which are sequentially arranged in the frequency stabilization module box, the input end of the polarization-maintaining fiber beam splitter is connected to the laser to be stabilized, the first output end of the polarization-maintaining fiber beam splitter is connected to the input end of the optical fiber electro-optic modulator, the output end of the optical fiber electro-optic modulator is connected to the first optical fiber collimator, the second output end of the polarization-maintaining fiber beam splitter is connected to the second optical fiber collimator, the output end of the first optical fiber collimator is aligned with the first input end of the optical fiber path, and the output end of the second optical fiber collimator is aligned with the second input end of the optical fiber path.

[0012] Optionally, the optical fiber path includes a half-wave plate component, a cylindrical rubidium Rb 87 Atomic gas chamber, polarization beam splitter prism, the incident side of the half wave plate assembly is aligned with the output end of the first optical fiber collimator, the exit side of the half wave plate assembly is aligned with the cylindrical rubidium Rb 87 The input end of the atomic gas cell is aligned with the cylindrical rubidium Rb 87The output end of the atomic gas cell is aligned with the first incident side of the polarization beam splitter prism, the output end of the second fiber collimator is aligned with the second incident side of the polarization beam splitter prism, and the exit side of the polarization beam splitter prism is aligned with the input end of the photoelectric detection assembly.

[0013] Optionally, the first optical fiber collimator, the half wave plate assembly, the polarization beam splitter prism, and the second optical fiber collimator are located on the same central axis.

[0014] Optionally, the cylindrical rubidium Rb 87 The center of the atomic gas chamber is located on the central axis, and the cylindrical rubidium Rb 87 The cylindrical axis of the atomic gas cell is tilted horizontally.

[0015] Optionally, the polarization beam splitting prism performs 90° reflection beam splitting and is aligned with a directional photoelectric detection component.

[0016] Optionally, the frequency stabilization module box includes a base plate, a cover plate, a front plate, a back plate, a left plate, a right plate, a second collimator adjustment frame, a first collimator pressure plate, a fiber flange bracket, a fiber pressure piece, a nut, a fourth fiber flange, an SMA connector, and a power connector; the second collimator adjustment frame, the first collimator pressure plate, the fiber flange bracket, and the fiber pressure piece are arranged on the base plate, the fourth fiber flange, the SMA connector, and the power connector are arranged on the front plate, and the fiber pressure piece is arranged on the base plate through the nut.

[0017] Optionally, an optical fiber wiring groove is provided on the bottom plate, and the optical fiber passage is provided in the optical fiber wiring groove.

[0018] Optionally, the second collimator adjustment frame includes an adjustment threaded hole and a glue injection hole, and the second fiber optic collimator is adjusted and positioned by a positioning locking screw and the adjustment threaded hole so that the axis of the second fiber optic collimator is aligned with the first fiber optic collimator, and is fixed by filling the glue injection hole with potting glue.

[0019] In the second aspect, the embodiment of the utility model further provides a laser frequency stabilization system, which includes a laser frequency stabilization module, a fiber laser, a fiber beam splitter, an MTS frequency stabilization circuit and a host computer as described in any one of the embodiments of the utility model, the MTS frequency stabilization circuit is communicatively connected to the host computer, the MTS frequency stabilization circuit is communicatively connected to the laser frequency stabilization module, the MTS frequency stabilization circuit sends a modulation signal to the laser frequency stabilization module, and receives a detection signal output by the laser frequency stabilization module, the MTS frequency stabilization circuit is signal-connected to the fiber laser, the fiber laser is connected to the fiber beam splitter via an optical fiber, and the laser frequency stabilization module receives the laser to be stabilized output by the fiber beam splitter.

[0020] In the embodiment of the utility model, a frequency stabilization module box, an optical fiber path and an optical fiber path are integrated, the input end of the optical fiber path is connected to the laser to be frequency stabilized, the first output end of the optical fiber path is connected to the first input end of the optical fiber path, the second output end of the optical fiber path is connected to the second input end of the optical fiber path, the output end of the optical fiber path is connected to the photoelectric detection component, and the photoelectric detection component outputs a detection signal; and the polarization-maintaining optical fiber beam splitter, the optical fiber electro-optic modulator, the first optical fiber collimator, the half-wave plate component, the cylindrical rubidium Rb are sequentially arranged in the frequency stabilization module box. 87 An atomic gas chamber, a polarization beam splitter, a second optical fiber collimator, and a photoelectric detection component; the input end of the polarization-maintaining optical fiber beam splitter is connected to the laser to be stabilized, the first output end of the polarization-maintaining optical fiber beam splitter is connected to the input end of the optical fiber electro-optic modulator, the output end of the optical fiber electro-optic modulator is connected to the first optical fiber collimator, and the second output end of the polarization-maintaining optical fiber beam splitter is connected to the second optical fiber collimator. The utility model can reduce the difficulty of spatial optical path adjustment in the existing modulation transfer spectroscopy (MTS) laser frequency stabilization solution, reduce the space volume, integrate the entire function into an integrated optical fiber frequency stabilization module, and realize long-term stable frequency stabilization of the laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of a laser frequency stabilization module provided by an embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of a laser frequency stabilization module provided by an embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a laser frequency stabilization module base plate provided by an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of installing the second optical fiber collimator provided in an embodiment of the utility model;

[0026] Figure 5 It is a structural schematic diagram of a laser frequency stabilization system provided by an embodiment of the utility model;

[0027] Among them, 1. frequency stabilization module box; 2. polarization-maintaining fiber beam splitter; 3. fiber electro-optic modulator; 4. first fiber collimator; 5. half-wave plate assembly; 6. cylindrical rubidium Rb 87 Atomic gas chamber; 7. Polarization beam splitter; 8. Second optical fiber collimator; 9. Photoelectric detection assembly; 11. Bottom plate; 12. Cover plate; 13. Front plate; 14. Back plate; 15. Left plate; 16. Right plate; 17. Central axis; 18. Positioning locking screw; 111. Second collimator adjustment bracket; 112. Pressure plate; 113. Silicone pressure plate; 114. Optical fiber flange bracket; 115. First optical fiber flange; 116. Second optical fiber Fiber flange; 117. third fiber flange; 118. nut; 131. fourth fiber flange; 132. SMA connector; 133. power connector; 1101. fiber routing trough; 1102. first fiber alignment base; 1103. electro-optic modulator base; 1104. cylindrical base; 1105. spectroscope base; 1106. alignment adjustment hole, 1112. adjustment threaded hole, 1113. glue filling hole. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those generally understood by ordinary technicians in the technical field to which the present application belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. In the description of the utility model, it is necessary to understand that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model. The terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0030] like Figure 1-Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of a laser frequency stabilization module provided by an embodiment of the utility model. Figure 2 This is a schematic diagram of the internal structure of a laser frequency stabilization module provided by an embodiment of the utility model. The laser frequency stabilization module includes a frequency stabilization module box 1, an optical fiber path and an optical fiber path, the input end of the optical fiber path is connected to the laser to be frequency stabilized, the first output end of the optical fiber path is connected to the first input end of the optical fiber path, the second output end of the optical fiber path is connected to the second input end of the optical fiber path, the output end of the optical fiber path is connected to the photoelectric detection component 9, and the photoelectric detection component 9 outputs a detection signal; and the polarization-maintaining fiber beam splitter 2, the optical fiber electro-optic modulator 3, the first optical fiber collimator 4, the half-wave plate component 5, the cylindrical rubidium Rb are sequentially arranged in the frequency stabilization module box 1. 87 Atomic gas chamber 6, polarization beam splitter prism 7, second fiber collimator 8, photoelectric detection component 9; the input end of the polarization-maintaining fiber beam splitter 2 is connected to the laser to be stabilized, the first output end of the polarization-maintaining fiber beam splitter 2 is connected to the input end of the fiber electro-optic modulator 3, the output end of the fiber electro-optic modulator 3 is connected to the first fiber collimator 4, and the second output end of the polarization-maintaining fiber beam splitter 2 is connected to the second fiber collimator 8.

[0031] In the embodiment of the utility model, the laser frequency stabilization module is mainly used to stabilize the frequency of the laser to maintain it at a certain accuracy.

[0032] The input end of the optical fiber path is connected to the laser to be frequency stabilized, which can be understood as the laser to be frequency stabilized entering through the optical fiber path.

[0033] The output end of the optical fiber path is connected to the photoelectric detection component 9, and the photoelectric detection component 9 is connected to the output end of the optical fiber path for outputting a detection signal.

[0034] In an embodiment of the utility model, a first output end of the optical fiber path is connected to a first input end of the optical fiber path, a second output end of the optical fiber path is connected to a second input end of the optical fiber path, an output end of the optical fiber path is connected to a photoelectric detection component, and the photoelectric detection component outputs a detection signal; and a polarization-maintaining optical fiber beam splitter, an optical fiber electro-optic modulator, a first optical fiber collimator, a half-wave plate component, a cylindrical rubidium Rb87 atomic gas chamber, a polarization beam splitter prism, a second optical fiber collimator, and a photoelectric detection component are sequentially arranged in the frequency stabilization module box; the input end of the polarization-maintaining optical fiber beam splitter is connected to the laser to be frequency stabilized, the first output end of the polarization-maintaining optical fiber beam splitter is connected to the input end of the optical fiber electro-optic modulator, the output end of the optical fiber electro-optic modulator is connected to the first optical fiber collimator, and the second output end of the polarization-maintaining optical fiber beam splitter is connected to the second optical fiber collimator. The utility model can reduce the difficulty of spatial optical path adjustment in the existing modulation transfer spectroscopy (MTS) laser frequency stabilization scheme, reduce the spatial volume, integrate the entire function into an integrated optical fiber frequency stabilization module, and realize long-term stable frequency stabilization of the laser.

[0035] Optionally, the optical fiber path includes a polarization-maintaining optical fiber splitter 2, an optical fiber electro-optic modulator 3, a first optical fiber collimator 4, and a second optical fiber collimator 8 which are sequentially arranged in the frequency stabilization module box 1, the input end of the polarization-maintaining optical fiber splitter 2 is connected to the laser to be stabilized, the first output end of the polarization-maintaining optical fiber splitter 2 is connected to the input end of the optical fiber electro-optic modulator 3, the output end of the optical fiber electro-optic modulator 3 is connected to the first optical fiber collimator 4, the second output end of the polarization-maintaining optical fiber splitter 2 is connected to the second optical fiber collimator 8, the output end of the first optical fiber collimator 4 is aligned with the first input end of the optical fiber path, and the output end of the second optical fiber collimator 8 is aligned with the second input end of the optical fiber path.

[0036] In the embodiment of the utility model, the input end of the polarization-maintaining fiber beam splitter 2 is connected to the laser to be frequency-stabilized, and the output end is divided into two branches, one of which is connected to the input end of the fiber electro-optic modulator 3, and the other is connected to the second fiber collimator 8. The output end of the fiber electro-optic modulator 3 is connected to the first fiber collimator 4, and the output end of the first fiber collimator 4 is aligned with the first input end of the fiber path, and the output end of the second fiber collimator 8 is aligned with the second input end of the fiber path, so that the frequency stabilization and adjustment of the laser to be frequency-stabilized can be achieved.

[0037] Optionally, the optical path includes a half-wave plate component 5, a cylindrical rubidium Rb 87 The atomic gas chamber 6, the polarization beam splitter prism 7, the incident side of the half wave plate assembly 5 is aligned with the output end of the first optical fiber collimator 4, and the exit side of the half wave plate assembly 5 is aligned with the cylindrical rubidium Rb 87 The input end of the atomic gas cell 6 is aligned with the cylindrical rubidium Rb 87 The output end of the atomic gas chamber 6 is aligned with the first incident side of the polarization beam splitter prism 7 , the output end of the second optical fiber collimator 8 is aligned with the second incident side of the polarization beam splitter prism 7 , and the exit side of the polarization beam splitter prism 7 is aligned with the input end of the photoelectric detection component 9 .

[0038] In the embodiment of the utility model, the optical path is located in the frequency stabilization module box 1, which includes a half-wave plate component 5, a cylindrical rubidium Rb 87 The atomic gas chamber 6 and the polarization beam splitter prism 7, wherein the incident side of the half wave plate assembly 5 is aligned with the output end of the first optical fiber collimator 4, and the exit side is aligned with the cylindrical rubidium Rb 87 The input end of the atomic gas cell 6 is aligned; the cylindrical rubidium Rb 87 The output end of the atomic gas chamber 6 is aligned with the first incident side of the polarization beam splitter prism 7; the output end of the second optical fiber collimator 8 is aligned with the second incident side of the polarization beam splitter prism 7; the exit side of the polarization beam splitter prism 7 is aligned with the input end of the photoelectric detection component 9, so that the frequency stabilization and adjustment of the laser to be stabilized can be achieved.

[0039] Optionally, the first optical fiber collimator 4 , the half wave plate assembly 5 , the polarization beam splitter prism 7 , and the second optical fiber collimator 8 are located on the same central axis 17 .

[0040] In the embodiment of the utility model, the first fiber collimator 4, the half wave plate assembly 5, the polarization beam splitter prism 7, and the second fiber collimator 8 are located on the same central axis 17, and the splitting ratio is adjusted by rotating the wave plate angle to obtain the optimal modulation detection photoelectric signal.

[0041] Optionally, the cylindrical rubidium Rb 87The center of the atomic gas chamber 6 is located on the central axis 17. 87 The cylindrical axis of the atomic gas chamber 6 is tilted horizontally.

[0042] In the embodiment of the present invention, the cylindrical rubidium Rb 87 The axis of the atomic gas chamber 6 is inclined with respect to the central axis 17, and the pump light and the detection light are directed to the rubidium Rb 87 The four-wave mixing effect occurs in the atomic absorption cell, thereby obtaining a modulated saturation absorption spectrum detection light signal.

[0043] Optionally, the polarization beam splitting prism 790° reflection splitting is aimed at the direction photoelectric detection component 9.

[0044] In the embodiment of the utility model, the polarization beam splitter prism 7 is installed in the beam splitter base 1105, and the polarization beam splitter prism 7 is bonded with optical fixing glue. The polarization beam splitter prism 7 is located on the optical axis and reflects the modulated detection light at 90° sideways.

[0045] The photoelectric detection component 9 is installed on the right board, receives the modulated detection light signal from the 790° side reflection of the polarization beam splitter prism, and outputs the modulated detection photoelectric signal.

[0046] Optionally, the frequency stabilization module box 1 includes a base plate 11, a cover plate 12, a front plate 13, a rear plate 14, a left plate 15, a right plate 16, a second collimator adjustment frame 111, a first collimator pressure plate 112, a fiber flange bracket 114, a silicone pressure plate 113, a nut 118, a fourth fiber flange 131, an SMA connector 132, and a power connector 133. The second collimator adjustment frame 111, the first collimator pressure plate 112, the fiber flange bracket 114, and the silicone pressure plate 113 are arranged on the base plate 11, the fourth fiber flange 131, the SMA connector 132, and the power connector 133 are arranged on the front plate 13, and the silicone pressure plate 113 is arranged on the base plate 11 through the nut 118.

[0047] In the embodiment of the utility model, the bottom plate 11 is provided with a base for placing the first fiber collimator 4, the fiber electro-optic modulator 3, the cylindrical rubidium Rb 87 Atomic gas chamber 6, polarization beam splitter prism 7. The first optical fiber collimator 4 is fixed by a pressure plate. Cylindrical rubidium Rb 87 The atomic gas chamber 6 and the polarization beam splitter prism 7 are fixed by glue.

[0048] Specifically, the front panel 13 is equipped with a fourth optical fiber flange as the input port of the laser to be stabilized, an SMA connector connected to the optical fiber electro-optic modulator as the modulation signal input end; an SMA connector connected to the photoelectric detection component as the detection signal output end; and a power connector connected to the photoelectric detection component as the power supply end.

[0049] Optionally, an optical fiber wiring groove 1101 is provided on the bottom plate 11 , and the optical fiber passage is provided in the optical fiber wiring groove 1101 .

[0050] In the embodiment of the utility model, the optical fiber path is arranged in the optical fiber routing groove 1101, which can effectively avoid mutual interference and crosstalk between optical fibers and improve the stability and reliability of the signal.

[0051] Optionally, the polarization-maintaining optical fiber beam splitter 2 is placed in a bottom plate optical fiber routing groove 1101 .

[0052] like Figure 3 As shown, Figure 3 It is a structural schematic diagram of the bottom plate of the laser frequency stabilization module provided by the embodiment of the utility model. Specifically, the bottom plate 11 is provided with an optical fiber routing groove 1101, a first optical fiber collimator base 1102, an electro-optic modulator base 1103, a cylindrical base 1104, and a beam splitter base 1105; the bottom plate 11 is installed with a second optical fiber collimator adjustment bracket 111; the bottom plate 11 is provided with two alignment adjustment holes 1106, which are sealed with nuts 118 after the optical path is aligned; the bottom plate 11 is the supporting substrate of the entire module, and the four side surfaces are provided with threaded holes to install the front plate, the rear plate, the left plate, and the right plate, and the cover plate forms a box body.

[0053] Optionally, the second collimator adjustment frame 111 includes an adjustment threaded hole 1112 and a glue injection hole 1113, and the second fiber optic collimator 8 is adjusted and positioned by positioning the locking screw 18 and the adjustment threaded hole 1112, so that the axis of the second fiber optic collimator 8 is aligned with the first fiber optic collimator 4, and is fixed by filling the glue injection hole 1113 with potting glue.

[0054] In the embodiment of the utility model, the position of the second optical fiber collimator 8 can be accurately adjusted by cooperating the positioning locking screw 18 with the adjustment threaded hole 1112, so that it is completely aligned with the first optical fiber collimator 4. Then, the potting glue is injected through the glue injection hole 1113 to further fix the collimator to prevent it from moving or being damaged in actual application.

[0055] like Figure 4 As shown, Figure 4 The second optical fiber collimator installation diagram provided by the embodiment of the utility model. Specifically, the second collimator adjustment frame 111 includes an adjustment threaded hole 1112 and a glue injection hole 1113, and the second optical fiber collimator 8 is adjusted and positioned by positioning the locking screw 18 and the adjustment threaded hole 1112, so that the axis of the second optical fiber collimator 8 is aligned with the first optical fiber collimator 4, and the glue injection hole 1113 is filled with potting glue to fix it.

[0056] In the embodiment of the utility model, the polarization-maintaining fiber beam splitter 2 is placed in the bottom plate fiber routing groove 1101, fixed by a silicone plate 113, the input end is connected to the fourth fiber flange 131, the first output end is connected to the input end of the fiber electro-optic modulator 3 through the first fiber flange 115, the output end of the fiber electro-optic modulator 3 is connected to the first fiber collimator 4 through the second fiber flange 116, and the second output end is connected to the second fiber collimator 8 through the third fiber flange 117. All fiber jumpers are wired along the bottom plate fiber routing groove 1101 and fixed with multiple silicone plates 113. The first fiber flange 115, the second fiber flange 116, and the third fiber flange 117 are fixed to the bottom plate 11 by the fiber flange bracket 114; the bottom plate 11 is provided with a first fiber collimation base 1102 for placing the first fiber collimator 4, the first fiber collimator 4 is fixed with screws by the first collimator pressing plate 112, the bottom plate 11 is provided with an electro-optic modulator base 1103, the fiber electro-optic modulator 3 is installed with screws; the bottom plate 11 is installed with a second fiber collimator adjustment bracket 111, the second fiber collimator 8 is placed, and 8 positioning locks are used. Tighten the screw 18 to adjust the threaded hole 1111, so that the output light spots of the first fiber collimator 4 and the second fiber collimator 8 are aligned with each other. The second fiber collimator adjustment frame 111 is provided with a glue hole 1112, which can be filled with a sealing glue to reliably fix the second fiber collimator 8. For ease of operation, the bottom plate is provided with two alignment adjustment holes 1106, which are sealed with nuts 118 after the optical path is aligned; the first fiber collimator 4 outputs pump light through the half-wave plate assembly 5, and the splitting ratio can be adjusted by rotating the wave plate angle to obtain the best detection signal. The half-wave plate assembly 5 is mounted on the bottom plate 11 by screws; the bottom plate 11 is provided with a cylindrical base 1104, and the cylindrical rubidium Rb is bonded with optical fixing glue. 87 Atomic gas chamber 6, rubidium Rb 87 The center of the atomic gas chamber 6 is located at the coaxial line 17, and the cylindrical axis is inclined to the coaxial line 17; the bottom plate 11 is provided with a beam splitter base 1105, and the polarization beam splitter prism 7 is bonded with an optical fixing glue. The polarization beam splitter prism 7 is located on the optical axis, and the 90° side reflection modulates the detection light; the photoelectric detection component 9 is installed on the right plate 15, and the center of the detector photosensitive surface faces the 90° reflection light path of the polarization beam splitter prism, receives the modulated detection light signal, and outputs the detection signal after photoelectric processing. The bottom plate 11 is the supporting substrate of the entire module, and the four side surfaces are provided with threaded holes, and the front plate 13, the rear plate 14, the left plate 15, and the right plate 16 are installed by screws. The cover plate 12 is installed by screwing screws to form the box body 1. The front plate 13 is the interface board of the module, and is installed with a fourth optical fiber flange 131 as the input port of the laser to be stabilized; an SMA connector 132 is used as the modulation signal input port to connect the electrical signal input end of the 780 optical fiber electro-optic modulator 3, an SMA connector 133 is used as the detection signal output port to connect the output end of the photoelectric detection component 9, and a power connector 133 is connected to the power end of the photoelectric detection component 9.

[0057] In the embodiment of the utility model, a frequency stabilization module box, an optical fiber path and an optical fiber path are integrated, the input end of the optical fiber path is connected to the laser to be frequency stabilized, the first output end of the optical fiber path is connected to the first input end of the optical fiber path, the second output end of the optical fiber path is connected to the second input end of the optical fiber path, the output end of the optical fiber path is connected to the photoelectric detection component, and the photoelectric detection component outputs a detection signal; and the polarization-maintaining optical fiber beam splitter, the optical fiber electro-optic modulator, the first optical fiber collimator, the half-wave plate component, the cylindrical rubidium Rb are sequentially arranged in the frequency stabilization module box. 87 An atomic gas chamber, a polarization beam splitter, a second optical fiber collimator, and a photoelectric detection component; the input end of the polarization-maintaining optical fiber beam splitter is connected to the laser to be stabilized, the first output end of the polarization-maintaining optical fiber beam splitter is connected to the input end of the optical fiber electro-optic modulator, the output end of the optical fiber electro-optic modulator is connected to the first optical fiber collimator, and the second output end of the polarization-maintaining optical fiber beam splitter is connected to the second optical fiber collimator. The utility model can reduce the difficulty of spatial optical path adjustment in the existing modulation transfer spectroscopy (MTS) laser frequency stabilization solution, reduce the space volume, integrate the entire function into an integrated optical fiber frequency stabilization module, and realize long-term stable frequency stabilization of the laser.

[0058] like Figure 5 As shown, Figure 5 It is a structural schematic diagram of a laser frequency stabilization system provided by an embodiment of the utility model. The laser frequency stabilization system includes a laser frequency stabilization module, a fiber laser, a fiber beam splitter, an MTS frequency stabilization circuit and a host computer as described in any one of the embodiments of the utility model, the MTS frequency stabilization circuit is communicatively connected to the host computer, the MTS frequency stabilization circuit is communicatively connected to the laser frequency stabilization module, the MTS frequency stabilization circuit sends a modulation signal to the laser frequency stabilization module, and receives a detection signal output by the laser frequency stabilization module, the MTS frequency stabilization circuit is signal-connected to the fiber laser, the fiber laser is connected to the fiber beam splitter through an optical fiber, and the laser frequency stabilization module receives the laser to be stabilized output by the fiber beam splitter.

[0059] In the embodiment of the utility model, a frequency stabilization module box, an optical fiber path and an optical fiber path are integrated, the input end of the optical fiber path is connected to the laser to be frequency stabilized, the first output end of the optical fiber path is connected to the first input end of the optical fiber path, the second output end of the optical fiber path is connected to the second input end of the optical fiber path, the output end of the optical fiber path is connected to the photoelectric detection component, and the photoelectric detection component outputs a detection signal; and the polarization-maintaining optical fiber beam splitter, the optical fiber electro-optic modulator, the first optical fiber collimator, the half-wave plate component, the cylindrical rubidium Rb are sequentially arranged in the frequency stabilization module box. 87An atomic gas chamber, a polarization beam splitter, a second optical fiber collimator, and a photoelectric detection component; the input end of the polarization-maintaining optical fiber beam splitter is connected to the laser to be stabilized, the first output end of the polarization-maintaining optical fiber beam splitter is connected to the input end of the optical fiber electro-optic modulator, the output end of the optical fiber electro-optic modulator is connected to the first optical fiber collimator, and the second output end of the polarization-maintaining optical fiber beam splitter is connected to the second optical fiber collimator. The utility model can reduce the difficulty of spatial optical path adjustment in the existing modulation transfer spectroscopy (MTS) laser frequency stabilization solution, reduce the space volume, integrate the entire function into an integrated optical fiber frequency stabilization module, and realize long-term stable frequency stabilization of the laser.

[0060] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred implementation methods, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A laser frequency stabilization module, characterized in that: The laser frequency stabilization module comprises a frequency stabilization module box (1), an optical fiber path and an optical fiber path, the input end of the optical fiber path is connected to the laser to be frequency stabilized, the first output end of the optical fiber path is connected to the first input end of the optical fiber path, the second output end of the optical fiber path is connected to the second input end of the optical fiber path, the output end of the optical fiber path is connected to a photoelectric detection component (9), and the photoelectric detection component (9) outputs a detection signal; and a polarization-maintaining optical fiber beam splitter (2), an optical fiber electro-optic modulator (3), a first optical fiber collimator (4), a half-wave plate assembly (5), a cylindrical rubidium Rb 87 Atomic gas chamber (6), polarization beam splitter prism (7), second optical fiber collimator (8), photoelectric detection assembly (9); The input end of the polarization-maintaining optical fiber beam splitter (2) is connected to the laser to be frequency-stabilized, the first output end of the polarization-maintaining optical fiber beam splitter (2) is connected to the input end of the optical fiber electro-optic modulator (3), the output end of the optical fiber electro-optic modulator (3) is connected to the first optical fiber collimator (4), and the second output end of the polarization-maintaining optical fiber beam splitter (2) is connected to the second optical fiber collimator (8).

2. The laser frequency stabilization module according to claim 1, characterized in that: The optical fiber path comprises a polarization-maintaining optical fiber beam splitter (2), an optical fiber electro-optic modulator (3), a first optical fiber collimator (4), and a second optical fiber collimator (8) which are sequentially arranged in the frequency stabilization module box (1); the input end of the polarization-maintaining optical fiber beam splitter (2) is connected to the laser to be frequency stabilized; the first output end of the polarization-maintaining optical fiber beam splitter (2) is connected to the input end of the optical fiber electro-optic modulator (3); the output end of the optical fiber electro-optic modulator (3) is connected to the first optical fiber collimator (4); the second output end of the polarization-maintaining optical fiber beam splitter (2) is connected to the second optical fiber collimator (8); the output end of the first optical fiber collimator (4) is aligned with the first input end of the optical fiber path; and the output end of the second optical fiber collimator (8) is aligned with the second input end of the optical fiber path.

3. The laser frequency stabilization module according to claim 2, characterized in that: The optical fiber path comprises a half-wave plate component (5), a cylindrical rubidium Rb 87 The atomic gas chamber (6), the polarization beam splitter prism (7), the incident side of the half wave plate component (5) is aligned with the output end of the first optical fiber collimator (4), and the exit side of the half wave plate component (5) is aligned with the cylindrical rubidium Rb 87 The input end of the atomic gas chamber (6) is aligned, and the cylindrical rubidium Rb 87 The output end of the atomic gas chamber (6) is aligned with the first incident side of the polarization beam splitter prism (7), the output end of the second optical fiber collimator (8) is aligned with the second incident side of the polarization beam splitter prism (7), and the exit side of the polarization beam splitter prism (7) is aligned with the input end of the photoelectric detection component (9).

4. The laser frequency stabilization module according to claim 3, characterized in that: The first optical fiber collimator (4), the half wave plate assembly (5), the polarization beam splitter prism (7), and the second optical fiber collimator (8) are located on the same central axis (17).

5. The laser frequency stabilization module according to claim 4, characterized in that: The cylindrical rubidium Rb 87 The center of the atomic gas chamber (6) is located on the central axis (17), and the cylindrical rubidium Rb 87 The cylindrical axis of the atomic gas chamber (6) is tilted horizontally.

6. The laser frequency stabilization module according to claim 5, characterized in that: The polarization beam splitting prism (7) reflects and splits the light at 90 degrees toward the directional photoelectric detection component (9).

7. The laser frequency stabilization module according to claim 6, characterized in that: The frequency stabilization module box (1) comprises a base plate (11), a cover plate (12), a front plate (13), a rear plate (14), a left plate (15), a right plate (16), a second collimator adjustment frame (111), a first collimator pressure plate (112), an optical fiber flange bracket (114), a silicone pressure plate (113), a nut (118), a fourth optical fiber flange (131), an SMA connector (132), and a power connector (133); the second collimator adjustment frame (111), the first collimator pressure plate (112), the optical fiber flange bracket (114), and the silicone pressure plate (113) are arranged on the base plate (11); the fourth optical fiber flange (131), the SMA connector (132), and the power connector (133) are arranged on the front plate (13); and the silicone pressure plate (113) is arranged on the base plate (11) through the nut (118).

8. The laser frequency stabilization module according to claim 7, characterized in that: An optical fiber wiring groove (1101) is provided on the bottom plate (11), and the optical fiber passage is provided in the optical fiber wiring groove (1101).

9. The laser frequency stabilization module according to claim 7, characterized in that: The second collimator adjustment frame (111) comprises an adjustment threaded hole (1112) and a glue injection hole (1113), and the second optical fiber collimator (8) is adjusted and positioned by means of a positioning locking screw (18) and the adjustment threaded hole (1112), so that the axis of the second optical fiber collimator (8) is aligned with the first optical fiber collimator (4), and the second optical fiber collimator (8) is fixed by filling a sealing glue through the glue injection hole (1113).

10. A laser frequency stabilization system, characterized in that: The laser frequency stabilization system comprises a laser frequency stabilization module, a fiber laser, a fiber beam splitter, an MTS frequency stabilization circuit and a host computer as described in any one of claims 1 to 9, wherein the MTS frequency stabilization circuit is communicatively connected to the host computer, the MTS frequency stabilization circuit is communicatively connected to the laser frequency stabilization module, the MTS frequency stabilization circuit sends a modulation signal to the laser frequency stabilization module, and receives a detection signal output by the laser frequency stabilization module, the MTS frequency stabilization circuit is signal-connected to the fiber laser, the fiber laser is connected to the fiber beam splitter via an optical fiber, and the laser frequency stabilization module receives the laser to be stabilized output by the fiber beam splitter.

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