Laser power monitoring device and method and laser
By using polarization direction adjustment and screening technology in the laser power monitoring device, photons in a specific polarization direction are selected for monitoring, the problem of large laser power monitoring error in the prior art is solved, and the accuracy and stability of monitoring are improved.
Patent Information
- Application Number
- CN202510082715.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-03-21
AI Technical Summary
In the prior art, the error of laser power monitoring is large, and it is difficult to meet the requirements of long-term stability and reliability.
A laser power monitoring device including light screening components, sampling sheets and monitoring components is adopted. Through polarization direction adjustment and screening, photons in a specific polarization direction are selected for monitoring to reduce interference from photons in other polarization directions.
It improves the accuracy of laser power monitoring, can monitor and adjust laser power more effectively, and meets the requirements of long-term stability and reliability.
Smart Images
Figure CN119666144A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of laser monitoring technology, and in particular to a laser power monitoring device, method and laser. Background Art
[0002] Long-term stability and reliability are important criteria for testing lasers. Long-term stability means that the error of the output laser power and / or frequency and / or wavelength is less than the preset value during the long-term operation of the laser.
[0003] In the prior art, in order to ensure the stability of the power of the laser output by the laser, a photoelectric converter, a thermocouple detector and other structures are usually set in the laser to directly monitor the power of the output laser in real time, so that the output laser can be actively adjusted when the error of the output laser is large.
[0004] However, this monitoring method has large errors and is difficult to meet the needs. Summary of the invention
[0005] This specification provides a laser power monitoring device, method and laser to at least partially solve the above-mentioned problems existing in the prior art.
[0006] This manual adopts the following technical solutions: This specification provides a laser power monitoring device, including a light screening component, a sampling piece, and a monitoring component; The sampling sheet is in the optical path of the monitored laser, and after passing through the sampling sheet, the monitored laser can be refracted or reflected into a first laser, and then reflected or refracted into a second laser; the light intensity of the first laser is much greater than that of the second laser; The monitoring component is arranged along the optical path of the second laser, and is used to monitor the power of the second laser; The light screening component includes an adjusting member, and a polarization direction adjusting element and a polarization direction screening element which are sequentially arranged along the optical path of the monitored laser or the second laser; the adjusting member is connected to the polarization direction adjusting element and is used to adjust the posture of the polarization direction adjusting element; the polarization direction adjusting element is used to adjust the polarization direction of the monitored laser or the second laser during the posture adjustment process; the polarization direction screening element can transmit or refract photons of a specific polarization direction in the monitored laser or the second laser to a preset direction.
[0007] Preferably, the monitored laser is linearly polarized light.
[0008] Preferably, the polarization direction adjusting element is a half-wave plate, a polarization rotator or a polarization converter.
[0009] Preferably, the polarization direction screening element is a thin film polarizer, a polarization beam splitter prism or a special coated lens.
[0010] Preferably, the sampling sheet is a white sheet or a reflector.
[0011] Preferably, the monitoring component includes a photoelectric sensor; The photoelectric sensor is used to convert the photons into electrical signals.
[0012] Preferably, the laser power monitoring device further comprises an absorption box; The absorption box is adjacent to the polarization direction screening element; The polarization direction screening element can also transmit or refract photons other than those in the specific direction to the absorption box; The absorption box is used to absorb the photons other than the photons in the specific direction.
[0013] Preferably, the monitored laser is incident on the sampling piece at the Brewster angle. On the other hand, the present specification provides a laser power monitoring method, using the laser power monitoring device provided by any one of the above aspects, the laser power monitoring method comprising: Sampling the monitored laser through a sampling sheet to obtain a second laser, and irradiating the second laser to the light screening component and the monitoring component; The posture of the polarization direction adjusting element is adjusted by the adjusting member in the light screening assembly until the power of the monitored laser reaches the maximum, thereby determining the power of the monitored laser.
[0014] On the other hand, the present specification provides a laser power monitoring method, using the laser power monitoring device provided by any one of the above aspects, the laser power monitoring method comprising: The monitored laser is sampled by a sampling sheet to obtain a second laser, and the second laser is irradiated to the monitoring component; the light screening component is arranged in the optical path of the monitored laser; The posture of the polarization direction adjusting element is adjusted by the adjusting member in the light screening assembly until the power of the monitored laser reaches the maximum, thereby determining the power of the monitored laser.
[0015] On the other hand, the present specification provides a laser, which includes the laser power monitoring device provided by any one of the above aspects.
[0016] At least one of the above technical solutions adopted in this specification can achieve the following beneficial effects: According to the above embodiment, the laser power monitoring device includes a light screening component, a sampling piece and a monitoring component. The sampling piece is in the optical path of the monitored laser, and after passing through the sampling piece, the monitored laser can be refracted or reflected as a first laser, and reflected or refracted as a second laser, and the light intensity of the first laser is much greater than that of the second laser. The monitoring component is arranged along the optical path of the second laser, and is used to monitor the power of the second laser. The light screening component includes an adjustment member, and a polarization direction adjustment element and a polarization direction screening element arranged in sequence along the optical path of the monitored laser or the second laser. The adjustment member is connected to the polarization direction adjustment element, and is used to adjust the posture of the polarization direction adjustment element. The polarization direction adjustment element is used to adjust the polarization direction of the monitored laser or the second laser during the posture adjustment process. The polarization direction screening element can transmit or refract photons of a specific polarization direction in the monitored laser or the second laser to a preset direction.
[0017] According to the above content, it can be seen that by using the polarization direction adjusting element and the polarization direction screening element, photons with a specific polarization direction are selected from the monitored laser for laser monitoring, which reduces the interference of photons with other polarization directions on power monitoring and improves accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings described herein are used to provide a further understanding of this specification and constitute a part of this specification. The illustrative embodiments and descriptions of this specification are used to explain this specification and do not constitute an improper limitation on this specification. In the drawings: Figure 1 A schematic diagram of fitting monitoring data and actual data provided for one embodiment of this specification; Figure 2 A schematic diagram of the structure of a laser power monitoring device provided in one embodiment of this specification; Figure 3 A schematic diagram of the structure of a laser power monitoring device provided in one embodiment of this specification; Figure 4 A schematic diagram of the structure of a laser power monitoring device provided in one embodiment of this specification; Figure 5 A schematic diagram of the structure of a laser power monitoring device provided in one embodiment of this specification; Figure 6 A schematic diagram of fitting monitoring data determined by a laser power monitoring device and actual data provided in one embodiment of this specification; Figure 7 A schematic diagram of a laser power monitoring method provided as a flow chart of an embodiment of this specification; Figure 8A schematic flow chart of a laser power monitoring method provided in accordance with an embodiment of the present specification.
[0019] Description of reference numerals: Light screening component 1; sampling piece 2; monitoring component 3; monitored laser 41; first laser 42; second laser 43; polarization direction adjusting element 11; polarization direction screening element 12. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solutions and advantages of this specification more clear, the technical solutions of this specification will be clearly and completely described below in combination with the specific embodiments of this specification and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0021] In the description of the present invention, it should be noted that the term "or" is generally used in a meaning including "and / or", unless the content clearly indicates otherwise.
[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0023] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0024] Parallel polarized light (plane polarized light, p-light) is polarized light whose electric field vibration direction is parallel to the incident plane. Vertically polarized light (senkrecht polarized light, s-light) is polarized light whose electric field vibration direction is perpendicular to the incident plane (plane). Usually, photons whose electric field vibration direction is at an angle of 0-45 degrees to the incident plane are regarded as p-light, and photons whose electric field vibration direction is at an angle of 45-90 degrees to the incident plane are regarded as s-light.
[0025] When photons in lasers pass through optical elements that can distinguish between p-light and s-light, they often follow the following rules: in, is the transmission probability of a photon, is the transmittance of the optical element for P light, is the transmittance of the optical element for s light, is the probability of reflection of a photon, is the reflectivity of the optical element for p light, is the reflectivity of the optical element for s light, is the angle between the electric field vibration direction of the photon and the incident plane.
[0026] That is, when a laser beam passes through is 1, is 0, is 0, When the polarization beam splitter is 1, the angle between any electric field vibration direction in the laser and the incident plane is For photons, , .
[0027] Polarization direction adjustment elements such as half-wave plates, optical rotators and polarization converters can adjust the electric field vibration direction of light. In other words, p-light can be converted into s-light after passing through a half-wave plate with a specific orientation, and s-light can also be converted into p-light after passing through a half-wave plate with a specific orientation.
[0028] Generally, different optical elements have different reflectivity and refractive index for p-light and s-light, and people can use this characteristic of optical elements to separate p-light from s-light in lasers. For example, specially made thin-film polarizers, polarization beam splitters, or special coated lenses can separate lasers into p-light and s-light.
[0029] Although the initial laser generated by the laser contains both p-light and s-light, due to the existence of depolarization and the different transmittance and refractive index of some optical components to p-light and s-light, when processing the initial laser, only the p-light or s-light in the initial laser is often processed, so that the laser output by the laser contains a large amount of p-light and a very small amount of s-light impurities, or contains a large amount of s-light and a very small amount of p-light impurities.
[0030] However, when the power of the laser output by the laser is monitored, a small amount of s-light impurities doped in the p-light, or a small amount of p-light impurities doped in the s-light, will affect the accuracy of the power monitoring.
[0031] Figure 1 A schematic diagram of fitting monitoring data and actual data provided for one embodiment of this specification, such as Figure 1 As shown in the figure, when the photoelectric converter, thermocouple detector and other structures are set in the direct laser for power monitoring, the fit between the monitoring data and the actual data is poor. The technical solutions provided by the embodiments of this specification are described in detail below in conjunction with the accompanying drawings.
[0032] Figure 2 A schematic diagram of the structure of a laser power monitoring device provided in one embodiment of this specification is shown in FIG. Figure 2 As shown, the laser power monitoring device includes a light screening component 1, a sampling piece 2 and a monitoring component 3.
[0033] Preferably, the laser power monitoring device is used to monitor the power of a laser. In this specification, the laser whose power is to be monitored is named as monitored laser 41.
[0034] Preferably, the sampling plate 2 is in the optical path of the monitored laser 41 , that is, the sampling plate 2 is directly irradiated by the monitored laser 41 .
[0035] Preferably, after being irradiated onto the sampling sheet 2 , the monitored laser 41 can be refracted or reflected into the first laser 42 , and then reflected or refracted into the second laser 43 .
[0036] That is, the monitored laser light 41 can be refracted into the first laser light 42 and reflected into the second laser light 43. Alternatively, the monitored laser light 41 can be reflected into the first laser light 42 and refracted into the second laser light 43.
[0037] Preferably, the monitored laser 41 contains a large amount of p-light and a very small amount of s-light impurities, and the monitored laser 41 is incident on the sampling plate 2 at the Brewster angle, so that the light intensity of the first laser 42 is much greater than that of the second laser 43 .
[0038] Preferably, the ratio of the light intensity of the second laser 43 to the light intensity of the monitored laser 41 is between 0.5% and 1.5%.
[0039] Preferably, the sampling sheet 2 can be a white sheet, a 45° reflector, etc., and this specification does not limit this.
[0040] Preferably, the monitoring component 3 is arranged along the optical path of the second laser 43 .
[0041] Preferably, the monitoring component 3 is used to monitor the power of the second laser 43. Those skilled in the art will appreciate that the technology related to laser power monitoring has been relatively mature, and this specification does not describe the specific structure of the monitoring component 3, nor does it limit the monitoring component 3.
[0042] Preferably, the light screening component 1 includes an adjusting member, a polarization direction adjusting element 11 , and a polarization direction screening element 12 .
[0043] Preferably, the polarization direction adjusting element 11 and the polarization direction screening element 12 are sequentially arranged along the optical path of the monitored laser 41 or the second laser 43 .
[0044] Figure 3 as well as Figure 4 Each of them is a schematic diagram of the structure of a laser power monitoring device provided by an embodiment of this specification. Figure 3 As shown, the polarization direction adjusting element 11 and the polarization direction screening element 12 are sequentially arranged along the optical path of the monitored laser 41. Figure 4 As shown, the polarization direction adjusting element 11 and the polarization direction screening element 12 are arranged in sequence along the optical path of the second laser 43 .
[0045] Preferably, the adjusting member is connected to the polarization direction adjusting element 11 .
[0046] Preferably, the adjusting member is used to adjust the posture of the polarization direction adjusting element 11 .
[0047] Preferably, the polarization direction adjusting element 11 is used to adjust the polarization direction of the monitored laser 41 or the second laser 43 during the posture adjustment process.
[0048] Preferably, the polarization direction adjusting element 11 is an element capable of adjusting the polarization direction, such as a half-wave plate, an optical rotator or a polarization converter.
[0049] Those skilled in the art will understand that, components such as half-wave plates and optical rotators can rotate the polarization direction of light by a certain angle, and when the posture of components such as half-wave plates and optical rotators changes, the angle by which the polarization direction of light is rotated is also adjusted accordingly.
[0050] Preferably, the monitored laser 41 is linearly polarized light.
[0051] Preferably, the polarization direction screening element 12 can only transmit or refract photons with a specific polarization direction in the monitored laser 41 or the second laser 43 to a preset direction.
[0052] Preferably, the polarization direction screening element 12 is a specially made thin-film polarizer, a polarization beam splitter prism or a special coated lens, etc., which can transmit or refract photons of a specific polarization direction to a preset direction.
[0053] Preferably, the angle between the specific polarization direction, ie, the electric field vibration direction and the incident plane is between 0 and 45 degrees, including 0 and 45 degrees. In other words, the polarization direction screening element 12 can transmit or refract the p-light to a preset direction.
[0054] Preferably, the angle between the specific polarization direction, ie, the electric field vibration direction and the incident plane is between 45 and 90 degrees, including 90 degrees. In other words, the polarization direction screening element 12 can transmit or refract the s-light to a preset direction.
[0055] Preferably, when the polarization direction screening element 12 is arranged along the optical path of the monitored laser 41, the preset direction is the direction toward the sampling sheet 2. When the polarization direction screening element 12 is arranged along the optical path of the second laser 43, the preset direction is the direction toward the monitoring component 3.
[0056] Preferably, the monitoring component 3 includes a photoelectric sensor or a thermocouple detector, etc., which is not limited in this specification.
[0057] Preferably, the photoelectric sensor is used to convert photons in the second laser 43 into electrical signals.
[0058] Preferably, the laser power monitoring device further includes an absorption box.
[0059] Preferably, the absorption box is adjacent to the polarization direction screening element 12 .
[0060] Preferably, the polarization direction screening element 12 is capable of transmitting or refracting photons with polarization directions other than the specific polarization direction to the absorption box.
[0061] Preferably, the absorption box is used to absorb photons irradiated onto its surface.
[0062] Figure 5 A schematic diagram of the structure of a laser power monitoring device provided in one embodiment of this specification is shown in FIG. Figure 5 As shown, the absorption box is adjacent to the polarization direction screening element 12.
[0063] Figure 6 A schematic diagram of fitting monitoring data determined by a laser power monitoring device and actual data is provided for one embodiment of this specification, such as Figure 6 As shown, obviously, compared with Figure 1 The monitoring data determined based on the laser power monitoring device has a good fit with the actual data.
[0064] According to the above embodiment, the laser power monitoring device includes a light screening component 1, a sampling piece 2 and a monitoring component 3. The sampling piece 2 is in the optical path of the monitored laser 41, and after passing through the sampling piece 2, the monitored laser 41 can be refracted or reflected into a first laser 42, and reflected or refracted into a second laser 43, and the light intensity of the first laser 42 is much greater than that of the second laser 43. The monitoring component 3 is arranged along the optical path of the second laser 43, and is used to monitor the power of the second laser 43. The light screening component 1 includes an adjustment member, and a polarization direction adjustment element 11 and a polarization direction screening element 12 arranged in sequence along the optical path of the monitored laser 41 or the second laser 43. The adjustment member is connected to the polarization direction adjustment element 11, and is used to adjust the posture of the polarization direction adjustment element 11. The polarization direction adjustment element 11 is used to adjust the polarization direction of the monitored laser 41 or the second laser 43 during the posture adjustment process. The polarization direction screening element 12 can transmit or refract photons of a specific polarization direction in the monitored laser 41 or the second laser 43 to a preset direction.
[0065] It can be seen from the above content that, through the polarization direction adjusting element 11 and the polarization direction screening element 12, photons with a specific polarization direction are selected from the monitored laser 41 for laser monitoring, which reduces the interference of photons with other polarization directions on power monitoring and improves accuracy.
[0066] The above is a laser power monitoring device provided by one or more embodiments of this specification. Based on the same idea, this specification also provides a corresponding laser power monitoring device method, such as Figure 7 as well as Figure 8 shown.
[0067] Figure 7 A schematic diagram of a laser power monitoring method provided in one embodiment of this specification is shown in FIG. Figure 7 As shown, the method specifically includes the following steps.
[0068] S800: sampling the monitored laser through a sampling sheet to obtain a second laser, and irradiating the second laser to the light screening component and the monitoring component.
[0069] Preferably, the laser power monitoring device method is implemented using the laser power monitoring device provided by any one of the above embodiments.
[0070] Preferably, the laser power monitoring device can be implemented by an electronic device, and the electronic device can be a laser control component, a single chip microcomputer, a programmable logic gate array, etc., and this specification does not limit this.
[0071] Preferably, the electronic device can sample the monitored laser through a sampling sheet to obtain a second laser, and irradiate the second laser to the light screening component and the monitoring component through the sampling sheet.
[0072] It should be emphasized that the monitored laser is divided into a first laser and a second laser after passing through the sampling sheet.
[0073] S820: adjusting the posture of the polarization direction adjusting element by means of the adjusting member in the light screening assembly until the power of the monitored laser reaches a maximum, thereby determining the power of the monitored laser.
[0074] Preferably, the electronic device can adjust the posture of the polarization direction adjustment element through the adjustment member in the light screening component until the monitored power of the monitored laser reaches a maximum, and determine the power of the monitored laser determined by the monitoring component.
[0075] Figure 8 A schematic diagram of a laser power monitoring method provided in one embodiment of this specification is shown in FIG. Figure 8 As shown, the method specifically includes the following steps.
[0076] S900: sampling the monitored laser through a sampling sheet to obtain a second laser, and irradiating the second laser to the monitoring component.
[0077] Preferably, the laser power monitoring device method is implemented using the laser power monitoring device provided by any one of the above embodiments.
[0078] Preferably, the laser power monitoring device can be implemented by an electronic device, and the electronic device can be a laser control component, a single chip microcomputer, a programmable logic gate array, etc., and this specification does not limit this.
[0079] Preferably, the electronic device can sample the monitored laser through a sampling sheet to obtain a second laser, and irradiate the second laser to the monitoring component through the sampling sheet.
[0080] Preferably, the light screening component is disposed in the optical path of the monitored laser, that is, the monitored laser preferably passes through the light screening component and then irradiates the sampling piece.
[0081] It should be emphasized that the monitored laser is divided into a first laser and a second laser after passing through the sampling sheet.
[0082] S920: adjusting the posture of the polarization direction adjusting element by means of the adjusting member in the light screening assembly until the power of the monitored laser reaches a maximum, thereby determining the power of the monitored laser.
[0083] Preferably, the electronic device can adjust the posture of the polarization direction adjustment element through the adjustment member in the light screening component until the monitored power of the monitored laser reaches a maximum, and determine the power of the monitored laser determined by the monitoring component.
[0084] It should be noted that all actions of acquiring signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.
[0085] The above are laser power monitoring devices and laser power monitoring methods provided in one or more embodiments of this specification. Based on the same idea, this specification also provides a corresponding laser.
[0086] Preferably, the laser includes the laser power monitoring device provided by any one of the above embodiments.
[0087] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity 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, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.
[0088] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.
[0089] The above description is only an embodiment of this specification and is not intended to limit this specification. For those skilled in the art, this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification should be included in the scope of the claims of this application.
Claims
1. A laser power monitoring device, characterized in that: Including light screening components, sampling pieces and monitoring components; The sampling sheet is in the optical path of the monitored laser, and after passing through the sampling sheet, the monitored laser can be refracted or reflected into a first laser, and then reflected or refracted into a second laser; the light intensity of the first laser is much greater than that of the second laser; The monitoring component is arranged along the optical path of the second laser, and is used to monitor the power of the second laser; The light screening component includes an adjusting member, and a polarization direction adjusting element and a polarization direction screening element which are sequentially arranged along the optical path of the monitored laser or the second laser; the adjusting member is connected to the polarization direction adjusting element and is used to adjust the posture of the polarization direction adjusting element; the polarization direction adjusting element is used to adjust the polarization direction of the monitored laser or the second laser during the posture adjustment process; the polarization direction screening element can transmit or refract photons of a specific polarization direction in the monitored laser or the second laser to a preset direction.
2. The laser power monitoring device according to claim 1, characterized in that: The monitored laser is linearly polarized light.
3. The laser power monitoring device according to claim 1, characterized in that: The polarization direction adjusting element is a half-wave plate, a polarization rotator or a polarization converter.
4. The laser power monitoring device according to claim 1, characterized in that: The polarization direction screening element is a thin film polarizer, a polarization beam splitter prism or a special coated lens.
5. The laser power monitoring device according to claim 1, characterized in that: The sampling sheet is a white sheet or a reflecting mirror.
6. The laser power monitoring device according to claim 1, characterized in that: The monitoring component includes a photoelectric sensor; The photoelectric sensor is used to convert the photons into electrical signals.
7. The laser power monitoring device according to claim 1, characterized in that: The laser power monitoring device also includes an absorption box; The absorption box is adjacent to the polarization direction screening element; The polarization direction screening element can also transmit or refract photons other than those in the specific direction to the absorption box; The absorption box is used to absorb the photons other than the photons in the specific direction.
8. The laser power monitoring device according to claim 1, characterized in that: The monitored laser is incident on the sampling piece at a Brewster angle.
9. A laser power monitoring method, characterized in that: Using the laser power monitoring device according to any one of claims 1 to 8, the laser power monitoring method comprises: The monitored laser is sampled by a sampling sheet to obtain a second laser, and the second laser is irradiated to the monitoring component; the light screening component is arranged in the optical path of the monitored laser; The posture of the polarization direction adjusting element is adjusted by the adjusting member in the light screening assembly until the power of the monitored laser reaches the maximum, thereby determining the power of the monitored laser.
10. A laser, characterized in that: The laser comprises the laser power monitoring device according to any one of claims 1-8.