If you just want to learn Oslo, you can download LT version, you can design ten faces, and general lens design is enough.
You can try to export OSLO optimized data to CODE V, which is better than OSLO in modeling!
OSLO is a representative optical design software, which deals with the layout and optimization of optical systems. Most importantly, it is used to determine the optimal size and shape of components in optical systems, such as cameras, customer products, communication systems, military/outer space applications and scientific instruments. In addition, it is often used to simulate the performance of optical systems and develop a set of special software tools for optical design, testing and manufacturing.
Scope and field of application of Oslo:
A camera/high resolution imaging system
Traditional lens/zoom lens/lens array
Gaussian beam/laser cavity
Optical fiber coupling optics
Non-sequential propagation system
Photosensitive polarization optics
Graded refractive index surface/aspheric surface/diffractive surface
Interference deformation
Optical detection instrument
astronomical telescope
Communication systems, military and space applications
Precision medical equipment: gastroscope and endoscope.
Oslo function description:
Designer-oriented design
Oslo emphasizes interactive optical design, and computers provide designers with easy-to-understand return information, so that designers can provide better explanations for making a key application. OSLO is unique in the use of interactive design controls, and the user interface is getting better and better.
Provide ability and accuracy
OSLO uses advanced design techniques, including various optimization and tolerance analysis methods, highly implemented non-sequential tracking, and the manufacture and analysis of speculative source models. OSLO is the first strict optical design program used on desktop computers, but it has been widely developed beyond other software.
adaptability
One of the first reasons why OSLO has become a tool for designers in this world is that it is easy to customize and adapt to the characteristics of programs. Oslo uses advanced software technology to introduce windows into the range of technical calculation ability. In fact, CCL language provided by OSLO is comparable to Sun's Java or Microsoft's Visual Basic software in application, and exceeds other simple optical design software supported by Microsoft language.
The characteristics of Oslo
OSLO is a powerful software with hundreds of built-in instructions and functions. OSLO modules are often updated and patched by users. It is impossible to list all the functions that OSLO software can do in detail. The following outlines the general features of Oslo, but this is not a complete and detailed catalogue.
Lens and material database
Special surface information
Zoom and multi-structure system
Arrays and unordered groups
Special aperture
Tolerance and component information
Polarization and thin film coating
Ray tracing
Diffraction and incoherence
optimization method
Tolerance analysis
Laser, optical fiber and Gaussian beam
Lighting analysis
Superlens and process function
Optical system design (Zemax beginner's manual)
Author: veryce Date of submission: July 2, 2005 10: 46
(First Edition, May 22, 2005)
Content outline:
order
Exercise 1: Single
Exercise 2: Double lens
Exercise 3: Newton telescope
Exercise 4: Schmidt-Ka seglin and aspheric corrector
Exercise 5: Multi-configuration laser beam expander
Exercise 6: Fold the mirror and coordinate rest.
Exercise 7: Use an additional date editor to optimize with a binary surface.
order
The measuring instruments of the whole China Satellite II "Red Elf" scientific load project are basically optical instruments. Therefore, the analysis, design and test of optical system is an important part of the whole payload development.
This beginner's manual provides beginners with software for optical system design exercises, and the whole system needs Zemax optical system design software. Basically, it is the Chinese translation of the course in Zemax user manual, which was completed by Cai Changqing and tested on ZEMAX E.E.7.0 Since Cai Changqing was not involved in the "Red Wizard" project, Huang Xiaolong took over the proofreading and independent inspection. The whole content has been tested on ZEMAX E.E.8.0, and we hope that through this beginner's manual (* * * has seven exercises) and more follow-up exercises and documents, the team members can further master the optical system design. (Chen Zhilong's explanation)
(Back to content outline)
Exercise 1: Single
You will learn how to enable Zemax, key in wavelength and lens data, generate light fan, OPD, dot diagram, define thickness solution and variables, and perform simple optical design optimization.
Suppose you want to design an F/4 single lens to be used on the optical axis, and the focal length is100 mm. In the visible spectrum, BK7 lens is used.
First, call ZEMAX's lens data editor (LDE). What is LDE? It is the workplace you want, such as what kind of lens you decide to use, how many lenses, radius, thickness, size, location and so on.
Then choose the light you want, circle the wavelength in the main menu system, enter the wavelength you want according to your preference, and choose different wavelengths at the same time. Now enter 0.486 in the first column, in microns, which is the F-ray spectrum of hydrogen atom. Enter 0.587 and 0.656 in the second and third columns, and then click 0.486 on the main wavelength, which is mainly used to calculate several main parameters of the optical system under paraxial optics (first-order optics), such as focal length, magnification and pupil size.
Then we have to decide how big the aperture of the lens is. Since the F/4 lens is specified, what is the so-called F/#? F/# is the ratio of the effective focal length f formed by infinite incident light to the diameter of paraxial entrance pupil. So the aperture we need now is 100/4=25(mm). So select General Data from the system menu, type 25 in the aperture value, and the aperture type defaults to the entrance pupil diameter. In other words, the size of entrance pupil is the size of aperture.
Back in LDE, you can see three different surfaces, namely OBJ, STO and IMA. OBJ is a luminous body, that is, a light source. STO means aperture. STO is not necessarily the first shot you see when lightning strikes. When you design an optical system, STO can be selected on any lens, usually the first lens is STO. If not, you can click on the STO column and add the shots you want before and after, so that STO will not fall on the first shot. IMA is the imaginary plane, which is the imaging plane. Back to our single piece, we need four surfaces, so on the STO column, choose to insert cifter, and then insert a lens after STO, the number is 2, usually OBJ is 0, STO is 1, and IMA is 3.
Then how to input the material of the lens as BK7. On the glass column of STO column, directly enter BK7. If the aperture is 25mm, the reasonable thickness of the first mirror is 4, which is also directly punched out. Then determine the radius of curvature of 1 and the second mirror, and choose 100 and-100 respectively, where the center of the circle is positive on the right side of the mirror, and negative on the contrary. Then the thickness of the second mirror is 100.
Now your input data is almost complete. How do you check whether your design meets the requirements? Select a sector in the analysis, where the light aberration will plot the transverse light aberration of the pupil coordinates. Among them, the aberration of light is calculated with the main light as the reference point. If the longitudinal axis is EY, that is, the aberration in the Y direction is called tangent or YZ plane. Similarly, the aberration in the X direction is called the XZ plane or sagittal plane.
The main purpose of Zemax is to help us correct defocus, and these problems can be solved by solves. The solution is a function of input variables such as curvature, thickness, glass, half diameter, conic and related parameters. Parameters are used to describe or supplement the solution of input variables. For example, the types of curvature include principal ray angle, pickup, edge ray normal, principal ray normal, equal optical path, element power, concentricity with the surface, etc. The parameter describing the calculation of the main ray angle is the angle, and the parameter for the supplementary pickup calculation is the surface and the scale factor, so the parameter itself is not the calculation, and the variable to be adjusted is the object of the calculation.
Click twice on the Thickness item in the Surface 2 column, change the Solution Type from Fixed to Edge Ray Height, and then click OK. This adjustment will set the height of the light at the edge of the lens on the optical axis to 0, that is, paraxial focusing. Update Lei Fan again, and you can find that the defocus has disappeared. But is this the optimal design? Adjust the radius term of surface 1 from fixed to variable again, and then change the radius of surface 2 and the height of edge light in surface 2 that abandoned the original thickness to variable. Then let's define a value function. What is a value function? The merit function is to set your ideal optical specification as a standard (for example, the focal length is 100mm), and then Zemax will constantly adjust the variables you input into solves, and subtract the calculated value from the standard you set to be the merit function value, so the smaller the merit function value, the better. When the minimum value is selected, the variable setting is completed, and the ideal merit function value is 0.
Now let's talk about how to build a value function. Zemax has defaulted to a built-in value function whose function is to minimize the RMS wavefront error, so first select the value function in the editor and enter the tool. It is not enough to press the default evaluation function key again and then press ok, that is, we choose the default evaluation function. We also need to stipulate that the value function is limited to the focal length of 100, because Zemax will find that the focal length is.
Wavefront aberration will have the best effect, which of course violates our design requirements. Therefore, insert a column back into the 1 column of the value function editor, and the second column will be displayed, representing surface 2. Type EFFL (effective focal length) in the type item of this column, type 100 in the target item of the same column, and set it to 1 in the weight item. Jump out of the value function editor, select the optimization item in the tool, press the auto key, and then jump out. At this point, you have completed the design optimization. Re-check Lei Fan. At this time, the maximum aberration has been reduced to 200 microns.
Other tests of optical properties can also use speckle pattern and OPD. From the analysis, the standard in the spot diagram is selected, and the spot is staggered up and down by about 400 microns. Compared with Airy diffraction disk, the latter is staggered by about 6 microns.
OPD is the optical path difference (compared with the main light) and is also selected from the analysis. From the light path in the fan, it is found that the aberration is about 20 waves, mostly focusing, spherical surface, spherical surface and axial color. Zemax also provides a tool to determine the first-order chromatic aberration, that is, chromatic aberration focal shift diagram. This is to draw the wavelength of the output light wave by the difference between the back focal length of various light waves and the first focal length calculated on the paraxial axis according to the main wavelength, which can point out the changes of various light waves in the paraxial focus. It can be transferred from the color focus shift of miscellaneous items in the analysis.
(Back to content outline)
● Exercise 2: Double lens
You will learn: draw layout and field curvature diagram, define edge thickness solution, field angle, etc.
A double lens consists of two pieces of glass, usually bonded together, so they have the same curvature. Using the dispersion characteristics of different glasses, the chromatic aberration can be corrected to the first order, so the main contribution of the residual chromatic aberration is the second order, so we can expect that when looking at the color focus shift diagram, it should be parabolic rather than straight, which is the result of the second order effect (of course, the scale of change must be much smaller than the first order, and the first order should be reduced).
Like exercise 1, we also need to design an optical system with a focal length of 100mm, and image it on the optical axis, but this time we used two pieces of glass to design it.
Select BK7 and SF 1 lens. The settings of wavelength and aperture are the same as in exercise 1. Since they are bifocal lenses, you only need to add another lens to the LDE in exercise 1. So call the LDE of exercise 1, insert a lens marked as 2 behind STO, or insert a lens marked as 1 in front of STO, and then click the surface of the lens with the mouse, and then choose to stop the surface, and a mirror here becomes the position of STO. Type BK7 (SF 1) in the glass project of the first and second lenses. Because there is no gap between BK7 and SF 1, this doublet lens is two lenses stuck together. If there is a gap, five mirrors are needed because another lens needs to be inserted between BK7 and SF 1.