CN109683312B - Method for adjusting image transfer relationship of adaptive optical system - Google Patents
Method for adjusting image transfer relationship of adaptive optical system Download PDFInfo
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- CN109683312B CN109683312B CN201910056518.XA CN201910056518A CN109683312B CN 109683312 B CN109683312 B CN 109683312B CN 201910056518 A CN201910056518 A CN 201910056518A CN 109683312 B CN109683312 B CN 109683312B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/18—Function characteristic adaptive optics, e.g. wavefront correction
Abstract
The invention relates to a method for adjusting image transfer relationship of an adaptive optical system, belonging to the technical field of adaptive optics, and the method comprises the following steps: when the deformable mirror driver is not applied with voltage, a CCD sensor is used for obtaining a light beam intensity diagram before pressure application, a plurality of deformable mirror drivers are selected and respectively applied with voltage, the CCD sensor is used for obtaining a light beam intensity diagram after pressure application, the light beam intensity diagram before pressure application and the light beam intensity diagram after pressure application are compared, whether a strict image transfer relationship is established between the deformable mirror and the CCD sensor or not is judged, then the image surface position of the deformable mirror is calibrated by accurately adjusting the position of the CCD sensor, the strict image transfer relationship established between the deformable mirror and the wavefront sensor in the adaptive optical system is ensured, and the accuracy of wavefront measurement and correction of the adaptive optical system is improved.
Description
Technical Field
The invention belongs to the technical field of adaptive optics, and particularly relates to a method for adjusting an image transfer relationship of an adaptive optical system.
Background
Wavefront distortion seriously affects laser beam quality, and Adaptive optics technology is widely used to eliminate wavefront distortion (first, Adaptive optics-a progressive review, proc. SPIE, Vol.1542,1991,2-17. second, Modeling and Control of a deformable mirror, Journal of Dynamic Systems, Measurement and Control, Vol.124,2002, 297-302). The adaptive optical system is a system for real-time detecting and correcting random optical wavefront aberration, and is mainly composed of wavefront sensor (Hartmann wavefront sensor or curvature sensor, etc.), wavefront corrector (tilting mirror, deformable mirror, etc.) and wavefront controller, etc.. The wavefront sensor detects aberration wavefront information in real time, the wavefront controller converts signals detected by the wavefront sensor into voltage control signals of each driver of the wavefront corrector through a control algorithm, and the voltage control signals drive the wavefront corrector to change the surface shape of the mirror surface, so that real-time correction of wavefront errors is realized. In order to obtain a good wavefront correction effect, a strict image transfer relationship needs to be established between a Deformable mirror and a wavefront sensor in an Adaptive optical system (first, Adaptive optics at the phase laser, proc. SPIE, Vol.6584,2007,658402, Deformable mirror based on piezoelectric actuators for the Adaptive system of the Iskra-6 dynamics, Quantum Electronics, Vol.37,2007,691-696.), and how to adjust the image transfer relationship in the Adaptive optical system with high precision is an urgent problem to be solved.
Disclosure of Invention
In order to solve the above problems, a method for adjusting an image transfer relationship of an adaptive optics system is proposed to improve accuracy of wavefront measurement and correction of the adaptive optics system.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for adjusting the image transfer relationship of an adaptive optical system comprises the following steps:
s1: adjusting the position of each optical element in the optical system to ensure that the incident beam is reflected to the CCD sensor through the deformable mirror;
s2: when no voltage is applied to the deformable mirror driver, a CCD sensor is used for obtaining a beam intensity diagram of the position of the image surface of the deformable mirror and defining the beam intensity diagram as a beam intensity diagram before pressure application;
s3: selecting a plurality of deformable mirror drivers and respectively applying voltage, and obtaining a plurality of light beam intensity graphs of the image surface positions of the deformed mirrors after pressure application by using a CCD sensor, wherein the light beam intensity graphs are defined as the light beam intensity graphs after pressure application;
s4: comparing the light beam intensity graph before pressure application with the light beam intensity graphs after pressure application respectively, if the light beam intensity distribution is not changed, determining that a strict image transfer relationship is established between the deformable mirror and the CCD sensor, and finishing the adjusting process, otherwise, determining that the strict image transfer relationship is not established between the deformable mirror and the CCD sensor and executing S5;
s5: the CCD sensor is moved along its optical axis, and S2 to S4 are repeatedly performed until a strict image transfer relationship is established between the distorting mirror and the CCD sensor.
Further, optical system includes spectroscope, reflector, CCD sensor, distorting lens and controller, the spectroscope slope sets up, and spectroscope and distorting lens are with the optical axis setting, and incident beam transmits to distorting lens behind the spectroscope, divide into sample beam and outgoing beam behind the spectroscope through the incident beam that distorting lens reflects back, reflector and CCD sensor are with the optical axis setting, and reflector and spectroscope correspond the setting, and sample beam incides to reflector and CCD sensor in proper order, the controller is connected with CCD sensor, distorting lens electricity respectively.
Furthermore, the included angles between the spectroscope and the horizontal plane and between the reflector and the horizontal plane are both 45 degrees.
Furthermore, a beam-shrinking assembly is further arranged between the reflective mirror and the CCD sensor, the beam-shrinking assembly comprises a first lens and a second lens which are confocal, and the optical axis of the beam-shrinking assembly is overlapped with the optical axis of the CCD sensor.
Furthermore, the reflecting mirror is plated with a reflection increasing film, and the first lens and the second lens are both plated with antireflection films.
Further, in step S3, the number of deformable mirror drivers to which the voltage is applied is selected to be not less than 3.
Further, in step S4, when at least one of the plurality of post-pressure-application light beam intensity maps is changed from the pre-pressure-application light beam intensity map, it is determined that a strict image transfer relationship between the deformable mirror and the CCD sensor is not established.
The invention has the beneficial effects that:
the method comprises the steps of obtaining a light beam intensity image before pressure application and a light beam intensity image after pressure application by using a CCD sensor, judging whether a strict image transfer relationship is established between a deformable mirror and the CCD sensor or not by comparing, and then calibrating the image surface position of the deformable mirror by accurately adjusting the position of the CCD sensor, so that the strict image transfer relationship is established between the deformable mirror and a wavefront sensor in a self-adaptive optical system, and the accuracy of wavefront measurement and correction of the self-adaptive optical system is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of an optical system according to the present invention;
FIG. 2 is a graph of beam intensity before application of pressure before CCD sensor position adjustment;
FIG. 3 is a graph of post-application beam intensity prior to CCD sensor position adjustment;
FIG. 4 is a graph of the beam intensity before pressure application after CCD sensor position adjustment;
fig. 5 is a diagram of the post-pressure beam intensity after CCD sensor position adjustment.
In the drawings: 1-incident beam, 2-spectroscope, 3-deformable mirror, 4-reflector, 5-first lens, 6-second lens, 7-CCD sensor, 8-controller, 9-emergent beam.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
The first embodiment is as follows:
a method for adjusting the image transfer relationship of an adaptive optical system comprises the following steps:
s1: and adjusting the position of each optical element in the optical system to ensure that the incident beam is reflected to the CCD sensor through the deformable mirror.
Specifically, as shown in fig. 1, optical system includes spectroscope 2, reflector 4, CCD sensor 7, deformable mirror 3 and controller 8, spectroscope 2 inclines to set up, and spectroscope 2 and deformable mirror 3 are with the optical axis setting, and incident beam 1 transmits to deformable mirror 3 behind spectroscope 2, and the incident beam that reflects back through deformable mirror 3 divide into sampling light beam and outgoing beam 9 behind spectroscope 2, reflector 4 and CCD sensor 7 are with the optical axis setting, and reflector 4 corresponds the setting with spectroscope 2, and sampling light beam incides to reflector 4 and CCD sensor 7 in proper order, controller 8 is connected with CCD sensor 7, deformable mirror 3 electricity respectively. In this embodiment, the included angles between the spectroscope 2 and the reflective mirror 4 and the horizontal plane are both 45 °. Meanwhile, a beam-shrinking component is further arranged between the reflective mirror 4 and the CCD sensor 7, the beam-shrinking component comprises a first lens 5 and a second lens 6 which are confocal, and the optical axis of the beam-shrinking component is overlapped with the optical axis of the CCD sensor 7. The reflecting mirror 4 is plated with a reflection increasing film, and the first lens 5 and the second lens 6 are both plated with reflection increasing films.
S2: when no voltage is applied to the anamorphic mirror driver, a beam intensity map of the position of the image plane of the anamorphic mirror is obtained by the CCD sensor 7 and defined as a beam intensity map before pressure application.
S3: a plurality of deformable mirror drivers are selected and applied with voltage respectively, a plurality of light beam intensity graphs of the image surface positions of the deformed mirrors after being pressed are obtained by the CCD sensor 7 and are defined as the light beam intensity graphs after being pressed, namely, the number of the light beam intensity graphs after being pressed is equal to the number of the selected deformable mirror drivers. Preferably, the number of deformable mirror drivers for applying voltage is not less than 3, that is, at least 3 post-pressure beam intensity maps are obtained.
S4: comparing the light beam intensity graph before pressure application with the light beam intensity graphs after pressure application respectively, and when the light beam intensity distribution in the light beam intensity graphs after pressure application is not changed, determining that a strict image transfer relation is established between the deformable mirror 3 and the CCD sensor 7, and ending the adjusting process; when at least one of the plurality of post-pressure beam intensity maps is changed from the pre-pressure beam intensity map, it is considered that a strict image transfer relationship is not established between the distorting mirror 3 and the CCD sensor 7, and at this time, S5 is performed.
S5: the CCD sensor 7 is moved back and forth along its optical axis, and S2 to S4 are repeatedly performed until a strict image transfer relationship is established between the distorting mirror 3 and the CCD sensor 7.
The deformable mirror driver applies voltage to change the wavefront information of the incident beam on the object plane of the deformable mirror without changing the intensity information, and then the incident beam is imaged on the CCD sensor. If a strict image transfer relationship exists between the deformable mirror and the CCD sensor, the intensity distribution of the light beam measured by the CCD sensor should not change before and after the deformable mirror driver applies the voltage. If there is no strict image transfer relationship between the deformable mirror and the CCD sensor, the intensity distribution of the light beam will change correspondingly due to the change of the wavefront information on the deformable mirror. Therefore, whether a strict image transfer relationship is established between the deformable mirror and the CCD sensor is judged by comparing the light beam intensity diagram before pressure application with the light beam intensity diagram after pressure application, and then the image surface position of the deformable mirror is calibrated by accurately adjusting the position of the CCD sensor, so that the strict image transfer relationship is established between the deformable mirror and the wavefront sensor in the adaptive optical system.
Example two:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
in this embodiment, the parameters of each optical element are as follows:
the aperture of the incident beam is 50 multiplied by 50mm, and the wavelength is 1053 nm; the aperture of the spectroscope is 100 multiplied by 100mm, the spectroscope is placed at 45 degrees, and the reflectivity of the spectroscope to 1053nm laser is 1 percent; the parameters of the deformable mirror are shown in table 1; the aperture of the reflector is 100 multiplied by 100mm, the reflector is placed at 45 degrees, and the reflectivity of the reflector to 1053nm laser is 99.95 percent; the aperture of the first lens is 100 multiplied by 100mm, and the focal length is 500 mm; the aperture of the second lens is 15 multiplied by 15mm, and the focal length is 40 mm; parameters of the CCD sensor are shown in table 2; the aperture of the emitted beam was 50X 50mm and the wavelength was 1053 nm.
Table 1: main technical parameters of deformable mirror
| Name of technical index | Technical index parameter |
| Effective caliber | 50mm×50mm |
| Actuator stroke | 10μm |
| Driver number and layout | 6X 6 Square |
| Minimum closed loop bandwidth | 1Hz |
| Surface reflectivity | ≥99.95％@1053nm |
Table 2: main technical parameters of CCD sensor
The specific adjustment process is as follows:
1. the CCD sensor measures the intensity information of the position of the image plane of the deformable mirror, and obtains a beam intensity map before pressure application, as shown in fig. 2.
2. The 4 drivers of the deformable mirror were randomly selected to apply voltages, resulting in 4 post-applied beam intensity plots, as shown in FIG. 3. Comparing fig. 3 with fig. 2, it is found that the intensity distribution of the light beam is obviously changed after the voltage is applied to the deformable mirror driver, which indicates that a strict image transfer relationship is not established between the deformable mirror and the CCD sensor.
3. And adjusting the front position and the rear position of the CCD sensor along the optical axis direction of the CCD sensor, and repeating iteration until the light beam intensity distribution in the light beam intensity diagram after pressure application is not changed, namely, the accurate and strict image transfer relation is established between the deformable mirror and the CCD sensor by adjusting the position of the CCD sensor. At this time, the intensity map of the light beam before the pressing is shown in fig. 4, the intensity map of the light beam after the pressing is shown in fig. 5, and when the intensity distribution of the light beam after the voltage is applied to the deformable mirror driver is not changed after the comparison between fig. 4 and fig. 5, it is shown that the precise and strict image transmission relationship is established between the deformable mirror and the CCD sensor.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (6)
1. A method for adjusting an image transfer relationship of an adaptive optical system is characterized by comprising the following steps:
s1: adjusting the position of each optical element in the optical system to ensure that the incident beam is reflected to the CCD sensor through the deformable mirror;
s2: when no voltage is applied to the deformable mirror driver, a CCD sensor is used for obtaining a beam intensity diagram of the position of the image surface of the deformable mirror and defining the beam intensity diagram as a beam intensity diagram before pressure application;
s3: selecting a plurality of deformable mirror drivers and respectively applying voltage, and obtaining a plurality of light beam intensity graphs of the image surface positions of the deformed mirrors after pressure application by using a CCD sensor, wherein the light beam intensity graphs are defined as the light beam intensity graphs after pressure application;
s4: comparing the light beam intensity graph before pressure application with the light beam intensity graphs after pressure application respectively, if the light beam intensity distribution is not changed, determining that a strict image transfer relationship is established between the deformable mirror and the CCD sensor, finishing the adjusting process, and when at least one of the light beam intensity graphs after pressure application is changed compared with the light beam intensity graph before pressure application, determining that the strict image transfer relationship is not established between the deformable mirror and the CCD sensor, and executing S5;
s5: the CCD sensor is moved along its optical axis, and S2 to S4 are repeatedly performed until a strict image transfer relationship is established between the distorting mirror and the CCD sensor.
2. The adjusting method according to claim 1, wherein the optical system includes a beam splitter, a reflective mirror, a CCD sensor, a deformable mirror, and a controller, the beam splitter is disposed obliquely, and the beam splitter and the deformable mirror are disposed coaxially, an incident beam is transmitted to the deformable mirror through the beam splitter, the incident beam reflected back by the deformable mirror is divided into a sampling beam and an outgoing beam through the beam splitter, the reflective mirror and the CCD sensor are disposed coaxially, and the reflective mirror is disposed corresponding to the beam splitter, the sampling beam is sequentially incident to the reflective mirror and the CCD sensor, and the controller is electrically connected to the CCD sensor and the deformable mirror, respectively.
3. The method of adjusting of claim 2, wherein the beam splitter and the mirror are each angled at 45 ° to the horizontal.
4. The adjustment method according to claim 2, wherein a beam reduction assembly is further provided between the mirror and the CCD sensor, the beam reduction assembly including a first lens and a second lens which are confocal, and an optical axis of the beam reduction assembly coinciding with an optical axis of the CCD sensor.
5. The adjustment method according to claim 4, wherein the reflective mirror is coated with an antireflection film, and the first lens and the second lens are both coated with antireflection films.
6. The adjustment method according to any one of claims 3 to 5, wherein in S3, the number of deformable mirror drivers for applying voltage is selected to be not less than 3.
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