CN101105951B - Optical head optical system optimization method - Google Patents
Optical head optical system optimization method Download PDFInfo
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- CN101105951B CN101105951B CN200710075381A CN200710075381A CN101105951B CN 101105951 B CN101105951 B CN 101105951B CN 200710075381 A CN200710075381 A CN 200710075381A CN 200710075381 A CN200710075381 A CN 200710075381A CN 101105951 B CN101105951 B CN 101105951B
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Abstract
The invention discloses a method for optimizing optical system in optical head, which belongs to the technical field of optical storage. The invention includes the following steps: (A). simulate the optical path according to the preliminary design result of optical system, and optimize the optical system to reach the diffraction limit with a first image quality evaluation function on the basis ofthe traditional aberration theory; (B). optimize the optical system secondarily with the sensitivity checked by the optical patch component in the optical system as the goal of optimization under thecondition of meeting the optimization limit of image quality theory. Because of the adoption of the first image quality evaluation function, the invention optimizes the optical system to reach the diffraction limit, and then optimizes the optical system secondarily with the sensitivity checked by the optical patch component in the optical system as the goal of optimization. Therefore, the invention can make the sensitivity of optical head meet the requirement of control system, and enhance the design and optimization efficiency of optical system in optical head.
Description
Technical field
The invention belongs to field of optical storage technology, more specifically say the optimization method that relates to optical system in a kind of optical head.
Background technology
Continuous development along with the optical storage industry, the recording density of light storage device constantly increases, wherein optical head is the core component of light storage device, optical system is as the also constantly development and change of significant design basis of optical head, present development trend is that optical maser wavelength is shorter and shorter, numerical aperture is increasing, and the volume of optical system is more and more littler etc.From present popular numerical aperture is the focus of the ruddiness optical storage optical head of 0.6/0.65 to optical storage technology of future generation---use the blue light optical storage optical head of 405nm wavelength, all use method of astigmatism objective lens out-of-focus appearance.For the optical system optimization of optical head, be evaluation function only in the prior art, can't control status detection sensitivity such as the focusing of optical head and channel trackings with quadratic power based on the wave aberration of Aberration Theory.Based on the designed optical head of the optimization method of this technology, its detection sensitivity possibly can't satisfy the requirement of control system.
Summary of the invention
Technical matters to be solved by this invention provides a kind of optimization method that can make the optical head detection sensitivity satisfy optical system in the optical head that control system requires.
Method of the present invention may further comprise the steps:
A, simulate light path,, adopt the first image quality evaluation function, optical system is optimized, reach diffraction limit based on Aberration Theory according to the primary design result of optical system;
B, under the optimization limit that satisfies based on Aberration Theory, be that the target of optimization is further optimized optical system with the sensitivity of light path element state-detection in the optical system, described step may further comprise the steps:
The light path element state parameter is a variable in B1, the selection optical system;
B2, the linear zone scope of observing focusing open loop error signal;
B3, serve as to optimize the result near the variable of depth of focus with the length of the linear zone scope that focuses on the open loop error signal.
Described step B2 may further comprise the steps:
B21, comprise and the parameter of the parameter that repeats to revise selection carry out the light path simulation;
B22, record result, and observe.This step is mainly by repeatedly revising parameter, and repeatedly light path simulation is for following optimization result selects to provide sufficient data support.
Described step B3 may further comprise the steps:
B31, calculate differ between physical length and the Design Theory depth of focus amount of linear zone scope of gained square as the second image quality evaluation function;
B32, be that the numerical value of the resulting variable of optimization of target serves as to optimize the result to make the second image quality evaluation function minimum.This is that selecting with the length of the linear zone scope that focuses on the open loop error signal serves as a kind of method of optimizing the result near the variable of depth of focus.
The light path element state comprises out of focus, channel tracking state parameter in the described optical system.This is than being easier to detected light path element state.Can be applied in the optimization of optical system in the optical head that method of astigmatism focuses on.
Described out of focus, channel tracking state parameter comprise the parameter of astigmatism element cylindrical mirror or clinoplane mirror.This is than being easier to detected light path element state parameter.
Described out of focus, channel tracking state parameter are selected from a kind of or its combination in the angle of material behavior, clinoplane mirror and 4 quadrant detector of angle, clinoplane mirror of radius-of-curvature, optical surface axis of symmetry and the 4 quadrant detector of cylindrical mirror optical surface.In concrete enforcement, can select any parameter wherein, certainly,, should select the combination of parameter for the effect that obtains teaching.
Described out of focus, channel tracking state parameter are the nonlinearity of astigmatism element, adjustable parameter.The convenient adjustment in optimizing process of such parameter.
The present invention is owing to adopting the first image quality evaluation function, be optimized optical system, reach diffraction limit after; Sensitivity with light path element state-detection in the optical system is the target double optimization optical system of optimization again.So can make the optical head detection sensitivity satisfy the control system requirement, improve Design for optical system and optimization efficient in the different optical head.
Description of drawings
Fig. 1 is the principle flow chart of optimization method among the embodiment.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
Method among the embodiment may further comprise the steps:
A, carry out the light path simulation,, adopt the first image quality evaluation Aberration Theory (i.e. the first image quality evaluation function), optical system is optimized, reach diffraction limit based on the conventional aberration theory according to the primary design result of optical system;
B, adopt the second image quality evaluation state-detection sensitivity, optical system in the optical head that the application method of astigmatism focuses on, with the parameter of astigmatism element cylindrical mirror in the system or clinoplane mirror (as the radius-of-curvature of cylindrical mirror optical surface, the angle of optical surface axis of symmetry and 4 quadrant detector, the material behavior of clinoplane mirror, the angle of clinoplane mirror and 4 quadrant detector etc.) as variable, with the second image quality evaluation function, optical system is optimized, promptly the length of linear zone scope of promptly simulating the focusing open loop error signal of output with the hot spot rate of change is optimization aim double optimization optical system near depth of focus, specifically may further comprise the steps:
Out of focus, channel tracking state parameter are variable in B1, the selection optical system, described parameter comprises the parameter of astigmatism element cylindrical mirror or clinoplane mirror, and described parameter can be a kind of or its combination in the angle of material behavior, clinoplane mirror and 4 quadrant detector of angle, clinoplane mirror of radius-of-curvature, optical surface axis of symmetry and the 4 quadrant detector of cylindrical mirror optical surface.Selected state parameter should be the nonlinearity of astigmatism element, the parameter of easily adjusting.
B2, the linear zone scope of observing focusing open loop error signal may further comprise the steps:
B21, comprise and repeat to revise structure parameter (being the parameter of selected parameter), carry out the light path simulation;
B22, record result, and observe;
B3, serve as to optimize the result near the variable of depth of focus with the length of the linear zone scope that focuses on the open loop error signal.Can determine needed variable by following concrete grammar:
B31, calculate differ between physical length and the Design Theory depth of focus amount of linear zone scope of gained square as the second image quality evaluation function,
B32, be that the numerical value of the resulting variable of optimization of target serves as to optimize the result to make the second image quality evaluation function minimum.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace; as: also this method can be applied in the optimization of optical system in the optical head that non-method of astigmatism focuses on, can also select the state parameter etc. of other optical element, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. the optimization method of optical system in the optical head may further comprise the steps:
A, simulate light path,, adopt the first image quality evaluation function, optical system is optimized, reach diffraction limit based on Aberration Theory according to the primary design result of optical system;
B, under the optimization limit that satisfies based on Aberration Theory, be that the target of optimization is further optimized optical system with the sensitivity of light path element state-detection in the optical system, described step may further comprise the steps:
The light path element state parameter is a variable in B1, the selection optical system;
B2, the linear zone scope of observing focusing open loop error signal;
B3, serve as to optimize the result near the variable of depth of focus with the length of the linear zone scope that focuses on the open loop error signal.
2. the optimization method of optical system is characterized in that in the optical head according to claim 1, and described step B2 may further comprise the steps:
B21, comprise and the parameter of the parameter that repeats to revise selection carry out the light path simulation;
B22, record result, and observe.
3. the optimization method of optical system is characterized in that in the optical head according to claim 1 and 2, and described step B3 may further comprise the steps:
B31, calculate differ between physical length and the Design Theory depth of focus amount of linear zone scope of gained square as the second image quality evaluation function;
B32, be that the numerical value of the resulting variable of optimization of target serves as to optimize the result to make the second image quality evaluation function minimum.
4. the optimization method of optical system is characterized in that in the optical head according to claim 1 and 2, and the light path element state comprises out of focus, channel tracking state parameter in the described optical system.
5. the optimization method of optical system is characterized in that in the optical head according to claim 4, and described out of focus, channel tracking state parameter comprise the parameter of astigmatism element cylindrical mirror or clinoplane mirror.
6. the optimization method of optical system in the optical head according to claim 4, it is characterized in that described out of focus, channel tracking state parameter are selected from a kind of or its combination in the angle of material behavior, clinoplane mirror and 4 quadrant detector of angle, clinoplane mirror of radius-of-curvature, optical surface axis of symmetry and the 4 quadrant detector of cylindrical mirror optical surface.
7. the optimization method of optical system is characterized in that in the optical head according to claim 4, and described out of focus, channel tracking state parameter are the nonlinearity of astigmatism element, adjustable parameter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710075381A CN101105951B (en) | 2007-08-01 | 2007-08-01 | Optical head optical system optimization method |
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| CN200710075381A CN101105951B (en) | 2007-08-01 | 2007-08-01 | Optical head optical system optimization method |
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| CN101105951A CN101105951A (en) | 2008-01-16 |
| CN101105951B true CN101105951B (en) | 2010-05-26 |
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| CN107561694A (en) * | 2017-10-26 | 2018-01-09 | 安徽博微太赫兹信息科技有限公司 | A kind of Monte Carlo focal plane imaging AUTOMATIC OPTICAL DESIGN method |
| CN117891069B (en) * | 2024-03-14 | 2024-05-28 | 中国科学院长春光学精密机械与物理研究所 | Optical system optimization design method for reducing refractive index error sensitivity |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081385A (en) * | 1997-07-09 | 2000-06-27 | Minolta Co., Ltd. | Optical system design and production method |
| CN1777831A (en) * | 2003-04-25 | 2006-05-24 | 奥林巴斯株式会社 | Method of designing optical system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081385A (en) * | 1997-07-09 | 2000-06-27 | Minolta Co., Ltd. | Optical system design and production method |
| CN1777831A (en) * | 2003-04-25 | 2006-05-24 | 奥林巴斯株式会社 | Method of designing optical system |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2002-267926A 2002.09.18 |
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