Aperture-configurable laser gyroscope and manufacturing method thereof

Abstract

The present invention discloses an aperture-configurable laser gyroscope and a manufacturing method in the field of laser gyroscope technology. The aperture-configurable laser gyroscope comprises a microcrystalline glass and a laser gyroscope arranged on the microcrystalline glass. The microcrystalline glass is divided into a left half of the microcrystalline glass and a right half of the microcrystalline glass by a dividing surface. The microcrystalline glass is provided with an optical path hole, an aperture, a patch surface, a shaking wheel mounting hole, an air storage hole and a stress relief hole. The aperture-configurable laser gyroscope and the manufacturing method can arbitrarily configure the cross-sectional shape of the aperture according to the actual needs of the mode selection, so that the laser gyroscope can work more stably and exert the best performance; because the radius of the optical path hole is larger than the radius of the aperture, it is only necessary to adjust the installation angle of the reflector so that the base mode light spot can pass through the aperture smoothly, so that the optical path hole and the aperture are allowed to have a larger coaxiality error, reducing the processing positioning requirements and production costs of the optical path hole.

Description

Technical Field

[0001] The present invention relates to the technical field of laser gyroscopes, and in particular to an aperture-configurable laser gyroscope and a manufacturing method thereof. Background Art

[0002] The laser gyroscope has the advantages of small size, high precision and good stability. It is one of the most widely used inertial components. Since the size of the laser gyroscope ring resonator is much larger than the laser wavelength, the resonator will operate in a multi-mode oscillation mode. In order to make the laser gyroscope work stably and perform at its best, it is necessary to make the laser gyroscope work in the fundamental mode (TEM00) mode. To this end, it is usually necessary to set a mode selection device-an aperture in the laser gyroscope ring resonator. Due to the influence of the length of the ring resonator and the radius of curvature of the reflector, the meridian radius and sagittal radius of the fundamental mode spot in the cavity are not equal, that is, the shape of the fundamental mode spot is elliptical. The relationship between the fundamental mode spot of the laser gyroscope and the length of the resonator is as follows: Figure 1 As shown, Figure 1 (a) is the relationship between the fundamental mode waist radius and the resonant cavity length; Figure 1 (b) is the relationship between the fundamental mode waist shape and the resonant cavity length. Figure 1 (a) Figure 1 (b) It can be seen that the spot radius in both directions at the fundamental mode waist increases with the increase of cavity length, and the sagittal radius of the spot increases faster than the meridian radius. As the cavity length increases, the spot of the eigenmode in the resonant cavity becomes flatter and flatter. The relationship between the fundamental mode spot of the laser gyroscope and the curvature radius of the reflector is as follows: Figure 2 As shown. Among them, Figure 2 (a) is the relationship between the fundamental mode waist radius and the curvature radius of the reflector; Figure 2 (b) is the relationship between the fundamental mode waist shape and the curvature radius of the reflector, given by Figure 2 (a) Figure 2 (b) It can be seen that the spot radius in both directions at the fundamental mode beam waist increases with the increase of the curvature radius of the reflector, and after the curvature radius increases to a certain extent, the spot radius in both directions increases synchronously, and as the curvature radius of the reflector increases, the spot shape eventually becomes close to a circle. Therefore, in order to achieve a better fundamental mode selection effect, the cross section of the aperture should also be designed to be the shape of the fundamental mode spot - an ellipse, so that the fundamental mode just passes through, while the higher-order modes are blocked and filtered.

[0003] The aperture for mode selection in the laser gyro is usually set in the middle of the annular optical path hole of its resonant cavity. Figure 3 As shown in FIG. 1 , the conventional laser gyro optical path hole and aperture position schematic diagram is specifically shown in FIG. Figure 3 As shown in (a), Figure 3 (a) Enlarged cross-sectional view of the aperture cut along the AA direction. Figure 3 (b) as shown. Figure 4 The figure shows the schematic diagram of the matching between the cross-sectional shape of the aperture and the shape of the light spot. Figure 3 In (a), 1 is the laser gyro, 2 is the optical path hole, and 3 is the aperture. Figure 3 In (b), the cross section of the aperture of the conventional laser gyro is circular, which has a large error in matching the fundamental mode spot shape when the laser gyro is working stably. Let the radius of the aperture of the circular cross section be a′, and Figure 1 and Figure 2 The long and short axis radii of the fundamental mode spot are a and b. Since the fundamental mode spot is an ellipse, a≠b, so That is, the shape of the circular cross-section aperture 3 does not match the shape of the elliptical fundamental mode light spot 8. Figure 4 (a) shows that even a small amount of matching error will have a significant impact on the working stability and accuracy of the laser gyro. Therefore, it is necessary to make the cross-sectional shape of the aperture 3 match the shape of the elliptical fundamental mode spot 8 as much as possible, so that the laser gyro can work in the most stable and optimal state. Therefore, The cross-sectional shape of the aperture 3 matches the shape of the light spot 8 well. Figure 4 (b). However, Figure 3 The processing method of the aperture 3 of the conventional laser gyroscope shown in (a) is usually to use a slender drill bit to extend from one side of the annular cavity through the optical path hole 2 to the middle position to drill the aperture 3. Since the drilling and milling tool in this processing method is limited by the optical path hole 2, it is difficult to process the aperture 3 to meet the requirements. Figure 4 (b) shows an aperture that matches the required elliptical cross-section.

[0004] In addition, Figure 3 The aperture 3 of the conventional laser gyroscope shown in (a) is drilled by a slender drill bit extending from one side of the annular cavity through the optical path hole 2 to the middle position. Since this processing method requires the drill bit to be long enough to reach the middle position of the optical path hole of the annular cavity, such a slender drill bit will bend and deform due to the cutting force during the drilling process, thereby affecting the processing accuracy of the aperture 3. The processing accuracy of the aperture 3 will also directly affect the mold selection, working stability and the final performance of the laser gyroscope. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide an aperture-configurable laser gyroscope and a manufacturing method, so as to solve the technical problems in the prior art that the traditional laser gyroscope is subject to constraints or restrictions when processing the aperture, the shape of the aperture and the elliptical base mode spot do not match in the actual mold selection process, and the processing positioning requirements and production costs are high. The cross-sectional shape of the aperture can be arbitrarily configured according to the actual mold selection needs, thereby reducing the processing positioning requirements and production costs of the optical path hole.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] The present invention provides an aperture-configurable laser gyroscope, comprising a microcrystalline glass and a laser gyroscope arranged on the microcrystalline glass, wherein the microcrystalline glass is divided into a left half of the microcrystalline glass and a right half of the microcrystalline glass by a dividing surface, and the microcrystalline glass is provided with an aperture, an optical path hole, a patch surface, a shaking wheel mounting hole, an air storage hole and a stress relief hole.

[0008] Furthermore, the aperture can configure the optical path of the laser gyroscope to be a three-sided annular optical path, a four-sided annular optical path, or a polygonal annular optical path; the aperture can configure the optical path of the laser gyroscope to include multiple optical path holes, and the diameters of the optical path holes are all the same.

[0009] Furthermore, the aperture is inserted into the middle position of one of the plurality of optical path holes, and the ellipse length and minor axis radius of the cross section of the aperture are both smaller than the diameter of the optical path hole.

[0010] The present invention provides a method for manufacturing a laser gyroscope with a configurable aperture, comprising the following steps:

[0011] S1. Cutting of glass-ceramics and processing of apertures;

[0012] S2. The glass-ceramic blocks are glued together to form a complete processing blank for the aperture-configurable laser gyro;

[0013] S3. The bonded glass-ceramic block is used as the processing object, and subsequent processing is performed on it according to the traditional laser gyroscope processing technology based on the laser gyroscope design parameters.

[0014] Furthermore, the S1 comprises the following steps:

[0015] S11. Take a piece of zero expansion coefficient glass-ceramic and divide it into a left half glass-ceramic and a right half glass-ceramic of substantially the same size;

[0016] S12. Processing the split surface of the left half of the glass-ceramic and the right half of the glass-ceramic in S11;

[0017] S13. According to the aperture design process, the split surface is used as the starting surface, and the aperture is drilled and milled perpendicular to the split surface.

[0018] Furthermore, the aperture design process in S13 includes the following steps:

[0019] S131. Based on the designed cavity length of the laser gyro and the selected reflector radius of curvature parameters, the energy distribution diagram of the light spot is simulated and calculated;

[0020] S132. Select the light spot with an energy value of 1 / e of the peak value as a reference for designing the aperture, and magnify it proportionally by 2-4 times to use it as the shape and size of the cross section of the aperture.

[0021] Further, the S2 comprises the following steps:

[0022] S21. Finishing and polishing the split surfaces of the left half of the glass-ceramic and the right half of the glass-ceramic;

[0023] S22. Ultrasonic cleaning is performed on the left and right half pieces of the glass-ceramic, and the split surface is wiped clean;

[0024] S23. Bond the left half of the microcrystalline glass and the right half of the microcrystalline glass by optical bonding using the dividing surface as the interface.

[0025] Furthermore, the method for manufacturing the laser gyroscope with configurable aperture can arbitrarily configure the cross-sectional shape of the aperture according to actual mold selection requirements, and is also suitable for processing arbitrary high-order mold selection apertures.

[0026] By adopting the above technical solution, the present invention has the following advantages:

[0027] The present invention provides an aperture-configurable laser gyroscope and a manufacturing method thereof, and the cross-sectional shape of the aperture can be arbitrarily configured according to the actual needs of mode selection, so that the laser gyroscope can work more stably and exert the best performance; in addition, since the radius of the optical path hole is larger than the radius of the aperture, it is only necessary to adjust the installation angle of the reflector so that the fundamental mode light spot can smoothly pass through the aperture, so that the optical path hole and the aperture are allowed to have a larger coaxiality error, thereby reducing the processing positioning requirements and production costs of the optical path hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the relationship between the fundamental mode waist shape and radius and the laser gyro cavity length;

[0029] Figure 2 is the relationship between the fundamental mode waist shape and radius and the curvature radius of the reflector;

[0030] Figure 3 It is a schematic diagram of the position and cross-sectional shape of the laser gyroscope optical path hole and aperture;

[0031] Figure 4 Schematic diagram of the matching between the cross-sectional shape of the aperture and the shape of the light spot;

[0032] Figure 5 It is a schematic diagram of the laser gyroscope spot energy distribution and the aperture and spot matching;

[0033] Figure 6 A schematic diagram of the segmentation of the microcrystalline glass of the aperture-configurable laser gyroscope of the present invention;

[0034] Figure 7 A schematic diagram of the drilling and milling process of the aperture of the present invention;

[0035] Figure 8 A schematic diagram of a whole piece of glass-ceramics bonded by optical adhesive of the present invention;

[0036] Fig. 9 It is a schematic diagram of the structure of the aperture configurable laser gyro of the present invention;

[0037] Fig.10 It is a schematic diagram of the method for manufacturing the aperture-configurable laser gyro of the present invention, which can arbitrarily configure the shape of the aperture cross section. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is described in detail below in conjunction with the drawings in the specification. It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] like Figure 3-Figure 9 As shown, the present invention provides an aperture-configurable laser gyroscope, including a microcrystalline glass and a laser gyroscope arranged on the microcrystalline glass. The microcrystalline glass is divided into a left half of the microcrystalline glass 1a and a right half of the microcrystalline glass 1b by a dividing surface. The microcrystalline glass is provided with an aperture 3, an optical path hole 2, a patch surface 4, a shaking wheel mounting hole 5, an air storage hole 6 and a stress relief hole 7.

[0040] The optical path of the diaphragm-configurable laser gyroscope is a three-sided annular optical path, a four-sided annular optical path, or a polygonal annular optical path. The optical path of the diaphragm-configurable laser gyroscope includes multiple optical path holes. The diameters of the optical path holes 2 of the three-sided annular optical path, the four-sided annular optical path, or the polygonal annular optical path are the same, and the diameter is 2.5 to 5 mm. In the middle position of an optical path hole in the annular optical path, a short fundamental mode selection diaphragm 3 is inserted. The length of the diaphragm 3 is 3 to 6 mm, and the ellipse long and short axis radii of the cross section of the diaphragm 3 are smaller than the diameter of the optical path hole. The embodiment of the present invention is described in detail by taking a laser gyroscope with a four-sided annular optical path diaphragm as an example.

[0041] like Figure 3As shown in (a), when the conventional laser gyro 1 processes the aperture 3, the slender drilling and milling tool extends from one side of the annular cavity through the optical path hole 2 to the middle position of the optical path to perform drilling and processing of the aperture 3. Since the drilling and milling tool in this processing method is constrained or limited by the optical path hole 2, it is difficult to process the aperture 3 with an elliptical cross section that matches the requirements. However, when the laser gyro microcrystalline glass is divided into two pieces with the geometric symmetry plane as the dividing plane, the aperture 3 can be directly processed with the dividing plane as the starting plane, and the drilling and milling tool is no longer limited by the optical path hole. Therefore, arbitrary motion control can be performed according to the shape of the mold selection spot, so as to obtain any desired aperture cross-sectional shape, that is, the aperture 3 can be arbitrarily configured according to the actual mold selection needs.

[0042] like Figure 6 As shown, the aperture configurable laser gyroscope is a laser gyroscope that divides the microcrystalline glass of a conventional laser gyroscope into a left half microcrystalline glass 1a and a right half microcrystalline glass 1b using a geometric symmetry plane as a dividing plane. 1a is the left half microcrystalline glass, 1b is the right half microcrystalline glass, and 1c is the dividing plane.

[0043] Figure 7 (a) shows a schematic diagram of the drilling and milling process of the configurable aperture. The configurable aperture 3 is usually a small hole of a short length of 3 to 6 mm, which can be processed on the left half of the microcrystalline glass 1a or the right half of the microcrystalline glass 1b. Taking the processing of the entire aperture 3 on the left half of the microcrystalline glass 1a as an example, the processing position of the aperture 3 is selected according to the specific laser gyro optical path parameters, and the drilling and milling process of the aperture 3 is carried out with the dividing surface 1c as the starting surface for the drilling and milling process. Figure 7 (a). 3 is the aperture, 14 is the drilling and milling tool. The enlarged cross-sectional shape of the aperture 3 is shown in detail as follows: Figure 7 (b) as shown.

[0044] Figure 8 (a) is a schematic diagram of a whole blank formed by optical bonding of the left half of the micro-ceramic glass 1a and the right half of the micro-ceramic glass 1b. After the aperture 3 is processed, the left half of the micro-ceramic glass 1a and the right half of the micro-ceramic glass 1b are bonded together by optical bonding with the dividing surface 1c as the bonding surface to form the aperture configurable laser gyroscope. The complete processing blank is as follows Figure 8 (a) shown. Figure 8 (b) Figure 8 (a) is an enlarged view of the aperture cross section taken along AA.

[0045] Fig. 9 (a) shows the aperture configurable laser gyro structure. Figure 8The aperture configurable laser gyro blank shown in (a) is subsequently processed according to the design parameters of the laser gyro according to the traditional laser gyro processing technology, such as processing the blank reference surface, optical path hole 2, patch surface 4, shaking wheel installation hole 5, gas storage hole 6, stress relief hole 7, etc. The structure of the aperture configurable laser gyro after processing is as follows Fig. 9 As shown in (a), Fig. 9 (b) Fig. 9 (a) is an enlarged view of the aperture cross section taken along AA.

[0046] The present invention also provides a method for manufacturing a laser gyroscope with a configurable aperture, which specifically comprises the following steps:

[0047] S1. Cutting of glass-ceramics and processing of apertures;

[0048] Among them, S1 includes the following specific steps:

[0049] S11. Take a piece of zero expansion coefficient glass-ceramic and divide it into a left half glass-ceramic 1a and a right half glass-ceramic 1b of substantially the same size;

[0050] S12. Processing the split surface 1c of the left half of the glass-ceramics 1a and the right half of the glass-ceramics 1b in step S11;

[0051] S13. According to the aperture design process, the aperture 3 is drilled and milled perpendicular to the dividing surface, taking the dividing surface 1c as the starting surface.

[0052] The aperture design process in S13 includes the following steps: Figure 5 As shown:

[0053] S131. Based on the designed cavity length of the laser gyro and the selected curvature radius of the reflector, the energy distribution diagram B of the light spot is simulated and calculated;

[0054] S132. Select the light spot 8 at the energy value of 1 / e of the peak value as the reference for designing the aperture, and magnify it by 2-4 times proportionally to use it as the shape and size of the cross section of the aperture 3.

[0055] S2. The glass-ceramic blocks are glued together to form a complete processing blank for the aperture-configurable laser gyro;

[0056] S2 includes the following specific steps:

[0057] S21. Finishing and polishing the split surface 1c of the left half of the glass-ceramic and the right half of the glass-ceramic;

[0058] S22. Ultrasonic cleaning is performed on the left and right half pieces of the glass-ceramic, and the split surface is wiped clean;

[0059] S23. Bond the left half of the microcrystalline glass and the right half of the microcrystalline glass by optical bonding using the dividing surface as the interface.

[0060] S3. The bonded glass-ceramic block is used as the processing object, and subsequent processing is performed on it according to the traditional laser gyroscope processing technology based on the laser gyroscope design parameters.

[0061] In addition, the present invention can arbitrarily configure the cross-sectional shape of the aperture according to the actual needs of the mode selection, so that the laser gyro can work more stably and exert the best performance. The method for manufacturing the laser gyro with an aperture configurable according to the present invention can also be applied to the processing of the aperture of any high-order mode selection mode, that is, in addition to the elliptical cross-sectional aperture of the basic mode selection mode, other arbitrary non-circular cross-sectional apertures can also be processed. For example, the spot and aperture of the TEM10 mode are specifically as follows: Fig.10 (a), where 9 is the spot shape of the TEM10 mode, and 10 is the cross-sectional shape of the mode selection aperture of the TEM10 mode; the spot and aperture of the TEM01 mode are shown in Fig.10 (b) shows that 11 is the spot shape of the TEM01 mode, and 12 is the cross-sectional shape of the mode selection aperture of the TEM01 mode.

[0062] Since the radius of the optical path hole 2 is larger than that of the aperture 3, it is only necessary to adjust the installation angle of the reflector so that the fundamental mode light spot can pass through the aperture 3 smoothly, thereby allowing a larger coaxiality error between the optical path hole and the aperture 3, reducing the processing positioning requirements and production costs of the optical path hole 2.

[0063] Finally, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the present invention and are not used as limitations on the present invention. Various equivalent changes or substitutions can be made without departing from the concept of the present invention. Therefore, as long as the changes to the above embodiments are within the scope of the essential spirit of the present invention.

Claims

1. An aperture-configurable laser gyro, characterized in that: The invention comprises a microcrystalline glass and a laser gyroscope arranged on the microcrystalline glass. The microcrystalline glass is divided into a left half microcrystalline glass and a right half microcrystalline glass by a dividing surface. The microcrystalline glass is provided with an aperture, an optical path hole, a patch surface, a shaking wheel mounting hole, an air storage hole and a stress relief hole.

2. The aperture configurable laser gyro according to claim 1, characterized in that: The aperture can configure the optical path of the laser gyroscope to be a three-sided annular optical path, a four-sided annular optical path, or a polygonal annular optical path; the aperture can configure the optical path of the laser gyroscope to include multiple optical path holes, and the diameters of the optical path holes are all the same.

3. The aperture-configurable laser gyro according to claim 2, characterized in that: The aperture is inserted into the middle position of one of the plurality of optical path holes, and the ellipse major and minor axis radii of the cross section of the aperture are both smaller than the diameter of the optical path hole.

4. A method for manufacturing a laser gyroscope with configurable aperture, characterized in that: The following steps are involved: S1. Cutting of glass-ceramics and processing of apertures; S2. The glass-ceramic blocks are glued together to form a complete processing blank for the aperture-configurable laser gyro; S3. The bonded glass-ceramic block is used as the processing object, and subsequent processing is performed on it according to the traditional laser gyroscope processing technology based on the laser gyroscope design parameters.

5. The method for manufacturing a laser gyro with configurable aperture according to claim 4, characterized in that: The S1 comprises the following steps: S11. Take a piece of zero expansion coefficient glass-ceramic and divide it into a left half glass-ceramic and a right half glass-ceramic of substantially the same size; S12. Processing the split surface of the left half of the glass-ceramic and the right half of the glass-ceramic in S11; S13. According to the aperture design process, the split surface is used as the starting surface, and the aperture is drilled and milled perpendicular to the split surface.

6. The method for manufacturing a laser gyro with configurable aperture according to claim 5, characterized in that: The aperture design process in S13 includes the following steps: S131. Based on the designed cavity length of the laser gyro and the selected reflector radius of curvature parameters, the energy distribution diagram of the light spot is simulated and calculated; S132. Select the light spot with an energy value of 1 / e of the peak value as a reference for designing the aperture, and magnify it proportionally by 2-4 times to use it as the shape and size of the cross section of the aperture.

7. The method for manufacturing a laser gyro with configurable aperture according to claim 4, characterized in that: The S2 comprises the following steps: S21. Finishing and polishing the split surfaces of the left half of the glass-ceramic and the right half of the glass-ceramic; S22. Ultrasonic cleaning is performed on the left and right half pieces of the glass-ceramic, and the split surface is wiped clean; S23. Bond the left half of the microcrystalline glass and the right half of the microcrystalline glass by optical bonding using the dividing surface as the interface.

8. The method for manufacturing a laser gyro with configurable aperture according to claim 4, characterized in that: The method for manufacturing a laser gyroscope with configurable aperture can arbitrarily configure the cross-sectional shape of the aperture according to actual mold selection requirements, and is also suitable for processing arbitrary high-order mold selection apertures.

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