Small integrated spatial light path light direction deviation detection system and method

Abstract

The invention discloses a small-sized integrated spatial light path light direction deviation detection system, which comprises an incident collimator, a spectroscope I, an acoustic optical modulator, a reflector A, a spectroscope II, a reflector B, a spectroscope III and an emergent collimator which are sequentially arranged on a main transmission light path, a C-lens optical fiber is arranged on a detection light path split by the spectroscope and is connected with a multi-channel optical power meter; the invention also discloses a detection method. The method is suitable for high-precision optical application such as quantum precision measurement, and can effectively identify the offset position when the final output power of the spatial light path is influenced by temperature or vibration or other external conditions, thereby greatly reducing the maintenance cost of the small integrated spatial light path.

Description

Technical Field

[0001] This invention relates to the field of quantum precision measurement technology, specifically to a small integrated spatial optical path optical pointing offset detection system and its detection method. Background Technology

[0002] Miniature integrated spatial optical paths are widely used in optical communication, sensing and monitoring, medical equipment, electronic products, aerospace, quantum precision measurement and other fields. Miniature integrated spatial optical paths are characterized by their small size, low power consumption, high stability, high integration, and higher output optical power, better polarization state maintenance and easier cost control compared to all-fiber optical paths.

[0003] However, due to its high integration and numerous components, the spatial optical path is more susceptible to the effects of high and low temperatures. Experiments have shown that after being stored at high and low temperatures of -40℃ or 65℃, the output optical power of the spatial optical path often does not return to its original power when it returns to room temperature, but rather decreases by 10 to 20% compared to the original output power.

[0004] This is because high and low temperatures affect the properties of the adhesive at the bonding points in the optical path, causing deformation of the adhesive layer and thus reducing the final coupling efficiency. During the adhesive bonding process, some adhesive layers may have hollow areas or excessive thickness due to the difficulty in controlling manual bonding. In such cases, it is impossible to visually determine which adhesive layer has changed the most, and this adhesive layer will still shift after subsequent high and low temperature cycles.

[0005] Existing methods for detecting optical pointing offset mainly include laser interferometry and CCD imaging. However, both methods increase size and system complexity, making them difficult to apply. Therefore, a compact and precisely located detection method is needed to determine specific locations in the spatial optical path that are easily affected by temperature. This would greatly improve the maintenance efficiency of the spatial optical path. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, one of the objectives of the present invention is to provide a small integrated spatial optical path optical pointing offset detection system that utilizes power feedback.

[0007] The technical solution adopted by this invention to solve its technical problem is: a small integrated spatial optical path optical pointing offset detection system, comprising an incident collimator, an acousto-optic modulator, a reflector A, a reflector B, and an exit collimator arranged sequentially on the main transmission optical path. A beam splitter is arranged between the incident collimator and the acousto-optic modulator, a beam splitter is arranged between the reflector A and the reflector B, and a beam splitter is arranged between the reflector B and the exit collimator. C-lens fiber A, C-lens fiber B, and C-lens fiber C are respectively arranged on the detection optical paths branched off from beam splitter A, beam splitter B, and beam splitter C.

[0008] The aforementioned small integrated spatial optical path optical pointing offset detection method further includes a multi-channel optical power meter connected to C-lens fiber A, C-lens fiber B and C-lens fiber C.

[0009] The aforementioned small-scale integrated spatial optical path optical direction offset detection method has a beam splitter, beam splitter one, beam splitter two, and beam splitter three-way beam ratio of 99:1.

[0010] The aforementioned small-scale integrated spatial optical path optical pointing offset detection method has C-lens fiber A, C-lens fiber B, and C-lens fiber C with anti-reflection treated incident end faces.

[0011] The aforementioned small integrated spatial optical path optical pointing offset detection method comprises an incident collimator, an acousto-optic modulator, and an exit collimator fixed to a base plate using screws and AB glue, and a reflector A and a reflector B fixed to a boss on the base plate using AB glue.

[0012] The second objective of this invention is to provide a small-scale integrated spatial optical path pointing offset detection method, comprising the following steps:

[0013] S1, at the preset detection node of the small integrated spatial optical path, beam splitter one, beam splitter two and beam splitter three are connected in series, so that beam splitter one, beam splitter two and beam splitter three in the detection system are arranged at a preset angle with the main optical axis of the optical path, the detection optical path is emitted perpendicular to the direction of the main transmission optical path, and the incident end face of the C-lens fiber is parallel and aligned with the detection light emission surface of the beam splitter.

[0014] S2, start the laser in the incident section, input a continuous laser with a wavelength of 780nm. At this time, the optical power received at the output end in the optical path is stable and the coupling efficiency is high.

[0015] S3, a standard power database is pre-established in C-lens fiber A, C-lens fiber B and C-lens fiber C at each preset detection node in the optical path: when there is no offset in the optical path, the detection light power coupled in the C-lens fiber at each node is recorded as the standard power value: the power of C-lens fiber A, C-lens fiber B and C-lens fiber C is recorded as P0, P1, P2 and P3 respectively;

[0016] S4, C-lens fiber A, C-lens fiber B and C-lens fiber C are coupled to receive the probe light and transmit the probe light to the optical power meter. The actual power value output from each C-lens fiber to the optical power meter is collected in real time and compared with the corresponding standard power value in the standard power database.

[0017] Furthermore, in step S5, the optical path is subjected to a high and low temperature environment test of -40℃ to 65℃ for more than 12 hours. After that, the actual power value is compared with the standard power value. If the output light power P0 decreases, P1, P2, and P3 are detected. If all of them decrease, it indicates that the light direction of the incident light from the incident collimator has shifted. If P1 is stable and P2 and P3 decrease, it indicates that the angle of the reflector A has shifted. If only P3 decreases, it indicates that the angle of the reflector B has shifted. If all of them are stable and only P0 decreases, it indicates that the coupling end of the output collimator has shifted.

[0018] Furthermore, in step S5, the offset of the light direction is calculated by using a preset correspondence between the power attenuation magnitude and the offset.

[0019] The beneficial effects of this invention are:

[0020] This invention features a compact structure that is well-suited for integrated applications: it employs a beam splitter and C-lens coupling to achieve real-time power feedback without altering the original compact structure of the small integrated spatial optical path, thus offering strong compatibility.

[0021] The cost of this invention is controllable: the main component of the detection method is a C-lens optical fiber, and other components are low-cost and easy to control.

[0022] This invention provides precise offset positioning: by setting detection units at key nodes in the optical path, the offset position is accurately located by utilizing power feedback differences, thus solving the problem that traditional methods can only determine the direction of the offset but cannot pinpoint the specific location. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the system of the present invention.

[0024] The labels for each figure are as follows: 10—incident collimator, 20—beam splitter one, 30—C-lens fiber A, 40—acousto-optic modulator, 50—reflector A, 60—beam splitter two, 70—C-lens fiber B, 80—reflector B, 90—beam splitter three, 100—C-lens fiber C, 110—outcrow collimator. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings.

[0026] Example 1

[0027] Reference Figure 1As shown, the present invention discloses a small integrated spatial optical path optical pointing offset detection system, comprising an incident collimator 10, a beam splitter 20, an acousto-optic modulator 40, a reflector A 50, a beam splitter 60, a reflector B 80, a beam splitter 90, and an exit collimator 110 arranged sequentially on the main transmission optical path. The beam splitter 20, beam splitter 60, and beam splitter 90 have a beam splitting ratio of 99:1. C-lens optical fibers A 30, B 70, and C 100 are respectively arranged on the detection optical paths split by beam splitter 20, beam splitter 60, and beam splitter 90. The C-lens optical fibers A 30, B 70, and C 100, which have undergone anti-reflection treatment at the output end face, are respectively connected to a multi-channel optical power meter.

[0028] The spatial optical path is a small integrated collimating optical path. The incident collimator 10, the acousto-optic modulator 40 and the output collimator 110 are fixed to the base plate with screws and AB glue. The reflector A 50 and the reflector B 80 are fixed to the boss of the base plate with AB glue.

[0029] This invention can accurately monitor the location where the light direction shifts without changing the spatial optical path structure. It is adapted to the compact structure design of small integrated optical paths, enabling real-time monitoring, reducing detection costs and operational difficulty, providing data support for optical path shifts, and ensuring the long-term stable operation of spatial optical paths.

[0030] Example 2

[0031] The present invention discloses a small-scale integrated spatial optical path optical pointing offset detection method, which includes the following steps.

[0032] S1, beam splitters 20, 60, and 90 are connected in series at a preset detection node of a small integrated spatial optical path, so that beam splitters 20, 60, and 90 in the detection system are arranged at a preset angle with the main optical axis of the optical path, and are used to split the transmitted light in the optical path into a main transmission optical path and a detection optical path at a fixed ratio of 99:1. The main transmission light continues to transmit along the original optical path, and the detection optical path is emitted perpendicular to the direction of the main transmission optical path. C-lens fiber A 30, C-lens fiber B 70, and C-lens fiber C100 are correspondingly arranged on the detection light emission side of beam splitters 20, 60, and 90, and the incident end face of the C-lens fiber is parallel and aligned with the detection light emission surface of the beam splitter.

[0033] S2, start the laser in the incident section, input a continuous laser with a wavelength of 780nm. At this time, the optical power received at the output end in the optical path is stable and the coupling efficiency is high.

[0034] S3, a standard power database is pre-established in C-lens fiber A 30, C-lens fiber B 70 and C-lens fiber C 100 at each preset detection node in the optical path: when there is no offset in the optical path, the detection light power coupled in the C-lens fiber of each node is recorded as the standard power value.

[0035] The probe optical power values ​​of the four detection nodes were collected by a multi-channel optical power meter. The power of the emitted light and the power of C-lens fiber A 30, C-lens fiber B 70 and C-lens fiber C 100 were recorded as P0, P1, P2 and P3 respectively. This set of values ​​was stored as a standard power database.

[0036] S4, C-lens fiber A 30, C-lens fiber B 70 and C-lens fiber C 100 are coupled to receive the probe light and transmit the probe light to the optical power meter. The actual power value output from each C-lens fiber to the optical power meter is collected in real time and compared with the corresponding standard power value in the standard power database.

[0037] S5. If the actual power value of a certain node decreases by more than a preset threshold compared to the standard power value, then the location of that node is determined to be the location of the light pointing offset. The optical path is subjected to a high and low temperature environment test of -40℃ to 65℃ for more than 12 hours. Afterwards, the power value is compared with the standard value. If the output light power P0 decreases, then P1, P2, and P3 are detected. If all decrease, then the light pointing offset is due to the incident collimator 10. If P1 is stable and P2 and P3 decrease, then the angle of reflector A 50 has shifted. If only P3 decreases, then the angle of reflector B 80 has shifted. If all are stable and only P0 decreases, then the coupling end of the output collimator 110 has shifted.

[0038] By analyzing the relationship between power attenuation and angle, the deflection angle of the light direction can be calculated.

[0039] Those skilled in the art will readily understand that the above description is merely a preferred use case of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A compact integrated spatial light path light pointing offset detection system, characterized by: It comprises an incident collimator (10), an acousto-optic modulator (40), a mirror A (50), a mirror B (80) and an exit collimator (110) arranged in sequence on a main transmission light path, a light splitter one (20) is arranged between the incident collimator (10) and the acousto-optic modulator (40), a light splitter two (60) is arranged between the mirror A (50) and the mirror B (80), a light splitter three (90) is arranged between the mirror B (80) and the exit collimator (110), and the light splitter one (20), the light splitter two (60) and the light splitter three (90) are respectively provided with a C-lens optical fiber A (30), a C-lens optical fiber B (70) and a C-lens optical fiber C (100) on the detection light paths.

2. A compact integrated spatial light path light pointing offset detection system according to claim 1, characterized in that It also comprises optical power meters connected with the C-lens optical fiber A (30), the C-lens optical fiber B (70) and the C-lens optical fiber C (100).

3. A small integrated spatial light path light pointing offset detection system according to claim 1 or 2, characterized in that The light splitting ratios of the light splitter one (20), the light splitter two (60) and the light splitter three (90) are 99:

1.

4. A compact integrated spatial light path light pointing offset detection system according to claim 3, wherein, The C-lens optical fiber A (30), the C-lens optical fiber B (70) and the C-lens optical fiber C (100) have anti-reflection treated incident end faces.

5. A compact integrated spatial light path light pointing offset detection system according to claim 4, wherein, The incident collimator (10), the acousto-optic modulator (40) and the exit collimator (110) are fixed on a bottom plate by screws and AB glue, and the mirror A (50) and the mirror B (80) are fixed on the bosses of the bottom plate by AB glue.

6. A small integrated spatial light path light pointing deviation detection method, using the detection system of claim 1, characterized in that, It comprises the following steps: S1, the light splitter one (20), the light splitter two (60) and the light splitter three (90) in the detection system are arranged at a preset angle with the main optical axis of the light path, and the detection light path is perpendicular to the direction of the main transmission light path; S2, the laser of the incident section is started, and continuous laser is input; S3, a standard power database is established in the C-lens optical fiber A (30), the C-lens optical fiber B (70) and the C-lens optical fiber C (100) in advance: when the light path is not offset, the powers of the C-lens optical fiber A (30), the C-lens optical fiber B (70) and the C-lens optical fiber C (100) are recorded as P0, P1, P2, P3 as standard power values; S4, the C-lens optical fiber A (30), the C-lens optical fiber B (70) and the C-lens optical fiber C (100) couple and receive the detection light and transmit it to the optical power meters, and the actual power values of the optical power meters are collected in real time, and the actual power values are compared with the corresponding standard power values in the standard power database; S5, if the actual power value of a certain node is attenuated by more than a preset threshold compared with the standard power value, it is determined that the position of the node is the position where the light pointing offset occurs.

7. The small integrated spatial light path light pointing offset detection method according to claim 6, characterized in that, The step S5 is to let the light path undergo a high-low temperature environment test of-40℃-65℃ for 12 hours or more, and then compare the actual power value with the standard power value. If the outgoing light power P0 decreases, then detect P1, P2, P3. If all decrease, then the light incident on the incident collimator (10) is deviated. If P1 is stable and P2, P3 decrease, then the angle of the mirror A (50) is deviated. If only P3 decreases, then the angle of the mirror B (80) is deviated. If all are stable and only P0 decreases, then the coupling end of the outgoing collimator (110) is deviated.

8. The small integrated spatial light path light pointing offset detection method according to claim 6, wherein, The step S5 is to calculate the deviation of the light direction through a preset corresponding relationship between the power attenuation amplitude and the deviation.

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