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2110 Topics

N
Fully Spectral
nadav.amitaiFully Spectral
posted in Got a question?

Imaging an Aspheric doublet using the operand REAY/X

Hello all, I hope you are all well in the Corona epoch. This is my first post.  Let's say I am trying to imaging a sensor of 4.8*6.4 mm with Aspheric doublet (FOV 15.2, EFFL 30). The total Aperture stop is 18*6 mm but for each group of fields(up,center,down) we are intrested in much smaller aperture of 6*6mm(displaced -6,0,6 mm respectively-see attached image). Rays outside ot this smaller aperture don't propagate further into the optical system. 1. I am trying to use the REAY/X operands for this approch by enforing the above rays to arrived to specific smaller aperture. Am i doing it right? 2.  Is there a way to use the multi configurations editor, to displace the apreture stop for each group of fields? I try to do it, but when using the 3d viewer, when choosing all configurations, it seem like it can't be done. Attached below the zemax files before and after opitmization and the merit function file. Many thanks, Nadav        

14
Sandrine Auriol
Zemax Staff
2 years ago
S
Ultraviolet
Sarah.GrabowskiUltraviolet
asked in Got a question?

Is there a faster way to make a lens radii variable than using the solve drop down menu?

Yes, OpticStudio has a built-in shortcut to toggle a variable on the radius, thickness, or material fields in the Lens Data Editor. Select the field with the value you want to assign as a variable (or highlight a range of them) and press Crtl+Z. A full list of shortcuts can be found under Setup…Project Preferences, selecting the Shortcut Keys tab on the left. Here you can not only see the default shortcuts, you can also customize the keystrokes for any one of them, or modify the active list from a selection of available shortcuts in order to use OpticStudio most efficiently for your needs.

1
Mark.Nicholson
Luminary
2 years ago
Berta.Bernad
Zemax Staff
Berta.BernadZemax Staff
posted in Got a question?

How can I model a cone in non-sequential?

This can be done with the Elliptical Volume object, setting either the Front R or Back R to be a really small value (1E-6). Or you can also use Part-Designer; you just need to use one of the pre-defined shapes and save it as a .ZPO object: Once done, you can import this object in the Non-Sequential Component Editor, and apply different properties or coatings to its faces:

0
Berta.Bernad
Zemax Staff
2 years ago
Csilla Timar-Fulep
Zemax Staff
Csilla Timar-FulepZemax Staff
posted in Got a question?

How can I fix the scale of a Layout plot?

If slider or visual optimizer is used in the system, it can be useful to be able to fix the scale on the Layout plot, to better understand how the system is changing when changing some thickness parameters. In the Classic view of the Layouts (both Cross-Section and 3D), there is a Scale Factor setting, that can be used to fix the scale of the plot: If the Scale Factor is set to 0, then 'Fill Frame' will be selected, which will scale the range of surfaces drawn to fill the graphic page. However, if the Scale Factor is set to a numeric value, then the plot will be drawn in 'real' scale, times the Scale Factor. For example, a scale factor of 1.0 will plot the lens actual size on the printer, while a factor of 0.5 will plot the lens at half scale. To use this feature, the Classic view can be turned on or off in the Setup tab > Project Preferences > Graphics > Enable Classic View.

0
Csilla Timar-Fulep
Zemax Staff
2 years ago
A
Anton.TravinskyMonochrome
posted in Got a question?

MTF50 through-focus

There is a 'Through-focus MTF feature'. Is there a way to extract MTF50 through focus instead of modulation at a certain frequency through focus?

4
Allie
Zemax Staff
2 years ago
T
Tiffany.HarteSingle Emitter
asked in Got a question?

Introducing a known wavefront error in sequential mode

I’m currently modelling an imaging system in sequential mode and want to check the effect of a beamsplitter quoted with a lambda/4 surface flatness and lambda wavefront error. As an approximation, is there a simple way to introduce the wavefront error at a dummy surface used to represent the beamsplitter? If I wanted to more accurately account for the surface flatness in reflection, would I need to use non-sequential mode? And how would I incorporate this property into the surface in that case? Thanks!

2
Mark.Nicholson
Luminary
2 years ago
C
Christophe.DangMonochrome
asked in Got a question?

Problem with coordinate references of Source Diode

Hello, There is something I don't understand with the way Source Diode are placed (see image below). I've got two Source Diode placed at the same X Position [0], same Z Position [-51.4], different Y Position. The object 8 is at Y8 = -145.25, object 9 is at Y9 = -62.25. The global Y reference pointing rightwards, I expect the object 9 to be at the right of the object 8 because Y9 > Y8, right? But it seems to be the contrary. Additionally, they seem to be unexpectedly at different Z position. So I suppose I did something wrong with the coordinate references. I checked the Modify Reference Object but both object seem to refere to the Global Reference. Any hint? Best regards

3
Sandrine Auriol
Zemax Staff
2 years ago
S
Ultraviolet
Sarah.GrabowskiUltraviolet
posted in Got a question?

Does OpticStudio use the paraxial approximations in its calculations?

The paraxial approximation of Snell’s Law is a first order approximation that reduces the full form of Snell’s Law from n sin(θ) = n’ sin(θ’) to the linear relationship n θ = n’ θ’ (where the primed quantities denote values after refraction), and is valid for very small angles (and thus rays that travel close to the optical axis). OpticStudio uses these paraxial rays in the computation of paraxial data such as the EFL, F/#, and entrance pupil diameter. However, OpticStudio uses the full form of Snell’s Law in most calculations and analyses because not all surfaces can be properly defined by the power of the surface at the vertex, and to account for aberrations, which are deviations from this ideal ray. While the first order approximations might have been crucial to expediting calculations done by hand, the speed of modern computers makes the difference in calculation time inconsequential when compared to the benefits of

0
S
Ultraviolet
2 years ago
K
Ultraviolet
KalebUltraviolet
posted in Got a question?

Not enough memory for 3D plate list error

The first thing you can try is to reduce the number of Layout Rays in the system. The Layout Rays are only used for showing rays on the layouts and will not have an effect on the Detector Viewer. Next, if you have CAD object in the system, I would recommending decreasing the ‘Chord Tolerance’ and ‘Surface Tolerance’. Other faceted objects in the system can have the resolution turned down as well by using the ‘Draw’ tab in the Object Properties. This may free up some memory. Finally, in the Non-Sequential tab of the System Explorer, there are settings for the ‘Maximum Segments per Ray’ and ‘Maximum Source File Rays in Memory’. Decreasing the ‘Maximum Segments per Ray’ could free up enough memory to render the system. Increasing the ‘Maximum Source File Rays in Memory’ could also work (A recommended value would be 1,000,000 rays). I would also suggest checking that the ‘Minimum Relative Intensity&

0
K
Ultraviolet
2 years ago
S
Ultraviolet
Sarah.GrabowskiUltraviolet
posted in Got a question?

Is there a way to list similar glasses side by side from different suppliers?

Located under the Libraries Tab…Material Tools is the Glass Compare tool.   This tool allows you to choose a reference glass catalog (the primary catalog) and it will select the closest equivalent glass from one or two other catalogs for each entry for materials used in the visible range. The user chooses the tolerance on the refractive index (nd) and the Abbe number (Vd) that defines the maximum allowable deviation from the characteristics of the primary material. Once run, you will see columns for each of the glass catalogs that allows for the quick comparison of what glasses can be easily substituted by one from another catalog. Each entry also includes a flag indicating the status of each glass type (Standard, Preferred, Obsolete, Special, or Melt), which may be particularly helpful if you are trying to find glass substitutes that are more common to reduce costs.  

0
S
Ultraviolet
2 years ago
Ali H
Ali HVisible
posted in Got a question?

New Help File Section on Batch Ray Tracing in Tracing Larger Number of Rays Section

My colleague and I have written a new section in the Help File on the BatchRayTrace interfaces available in the ZOS-API, so I thought I would mention it on the Forum :) In short, instead of tracing the rays one at a time, an array of all the rays is passed to OpticStudio at a single time, OpticStudio traces all the rays and passes the entire array back to the Programming software. This method is called IBatchRayTrace. It is a bit more complex to program than performing a single ray trace, but it traces numerous rays at the same time through OpticStudio’s multithreading capability. The new section may be found in the Tracing Large Number of Rays section: The Programming Tab > About the ZOS-API > Tracing Large Numbers of Rays (About the ZOS-API) Happy coding! Best, Ali

1
Mark.Nicholson
Luminary
2 years ago
Michael Cheng
Zemax Staff
Michael ChengZemax Staff
posted in Got a question?

How does Relative Illumination considered in Image Simulation? Is gamma correction used?

In this post, we will demo an example to show how relative illumination is used in the tool Image Simulation. One of the frequently asked questions about Image Simulation is how it affect the result when we check the option 'Use Relative Illumination'. Another related question is whether this tool has considered gamma correction, such like the transfer function defined in the sRGB color space. Quick answers to the two questions are: (1) If the relative illumination is considered, for every PSF calculated in the PSF grid, the relative illuminateion is calculated for that field position and the entire PSF for that field position is multiplied by that value. (2) There is no gamma correction done in the Image Simulation result. The gray scale value you find in the result bitmap is linear to the relative illumination we see.   Let's do a quick experiement to see how it works. 1. Open attached test2_50deg.zar. This is a very simple system inlcuding only OBJECT, Paraxial l

1
Michael Cheng
Zemax Staff
2 years ago
S
Ultraviolet
Sarah.GrabowskiUltraviolet
asked in Got a question?

Is there a way to create a custom catalog with existing glasses?

I am working on a project where I am limited to a specific list of glasses. They are mostly Ohara materials, but also include a couple from the Schott catalog. How can I create a new catalog that will group these all together for optimization purposes?

1
S
Ultraviolet
2 years ago
Matthias.Whitney
Matthias.WhitneyInfrared
asked in Got a question?

Issue adding new material to catalog

I'm having an issue adding a custom material into the catalog. I have index of refraction data taken at several wavelengths and I'm following the knowledge base article 'Fitting index data in OpticStudio' (https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01525). After using the glass fitting tool under Material Tools in the Libraries ribbon, I upload my index data and I'm presented with the text window that shows my fit Sellmeier or Schott coefficients. I can find my glass under the catalog with the fit coefficients, but there is no value for Nd or Vd. And when I look at the dispersion diagram under Materials Analyses, it's just a flat line at zero. What step am I missing to correctly add this custom material?

2
Matthias.Whitney
2 years ago
Andrew.Dennington
Andrew.DenningtonInfrared
posted in Got a question?

IES TM25 Rayfiles

The IES TM25 standard for ray files has been out for years but we are still waiting for Zemax to allow these files to be imported in to optical models.  Osram only provides ray files bigger than 10M rays for its LEDs in TM25 format so it is definitely needed and its hard to understand why there has been such a delay.  Having read the TM25 standard it would take very little development time to implement. Andrew

2
P
2 years ago
Allie
Zemax Staff
AllieZemax Staff
asked in Got a question?

Can I simulate a specific Gaussian beam in POP if I know the M2 value?

If I know the M2 value of the Gaussian beam I want to study, can I use that value to accurately simulate the beam in the Physical Optics Propagation tool?

2
Sandrine Auriol
Zemax Staff
2 years ago
H
Haofeng.SunMonochrome
posted in Got a question?

Simulate fiber coupling issues

I am trying to simulate the single mode fiber coupling and would like to see how the beam profile looks like when the incoming beam to the fiber is converging or diverging by changing the shape of the lens. I created a simple system with a lens, and inserted the fiber as a non-sequantial component. Since the core diameter is too small and length of the fiber is too large compared with the lens, I cannot see what's going on inside the fiber from the layout plot. I tried to use the standard spot diagram to see the beam profile, but it only gives me a single point. The receiver efficiency also drops from 99% to around 1% after I inserted the fiber. Does anyone know whether my method is incorrect or Zemax is not capable of performing such systems? Thanks a lot! Haofeng Sun

1
Csilla Timar-Fulep
Zemax Staff
2 years ago
A
Adrian.grausMonochrome
asked in Got a question?

A source lamp with absorption inside a reflector cavity

Hi, I am modeling a cavity reflector which have 3 holes, one it is the output, the others are due lamp connections and water cooling. I want to model a lamp which absorbs the rays reflected by the reflector cavity and cross the lamp.  I use a source tube and defined a annular volume, concentric to source tube and with smaller external radius, and defined an absorbing coating on the external annular body  surface.  Doing it ZEMAX start to transmit rays out of the reflector on surfaces which were defined as mirror at material.   I inspected all the objects and all are defined as 'never' at Ray trace ignore object option.  When replacing the  source tube (and removing the annular absorber)  by a source volume, the mirrors work properly.   How can make the source to be transparent to rays emitted and absorbs the rays reflected by the cavity and crossing the source volume/surface? Best R

4
A
2 years ago
D
Denis.NaughtonSingle Emitter
asked in Got a question?

Uploading my .bmp file for image simulation

Is it possible to upload my own .bmp file for image Simulation analysis? IF so where in the directory structure must i save the .bmp file so that it is vissible in the Image simulation pulldown menu?

2
D
2 years ago
S
Ultraviolet
Sarah.GrabowskiUltraviolet
posted in Got a question?

What is the difference between the Global and Hammer Optimization options?

When it comes to optimizing a system, there are a couple different options. Global and Hammer Optimization are the two global techniques available in OpticStudio, located under the Optimize tab. These two algorithms differ most prominently in the scope of their search. Global optimization is great if you are looking to explore possible design forms. It searches more broadly over all the parameters, saving the 10 best solutions for you. Hammer optimization, on the other hand, is more useful for improving a design you already have. It searches for similar designs that have lower merit functions. However, it does not search on as large of a scale as the Global Search. In many projects, it will likely help for you to use both! Generally, Global optimization would be used in the early stages of the project as you test out the design space, followed by some local optimization, and finally Hammer optimization to more thoroughly improve your design.

0
S
Ultraviolet
2 years ago
D
Daniel.SchaefferSingle Emitter
asked in Got a question?

Inhomogeneous scatter density in the bulk material

I would like to simulate bulk scattering in non-sequential mode. However, the density of scattering centres in my material should not be homogeneous, but should increase as a function of the bulk width x. How is this possible? Is there already a .dll I could use? Thank you for your help!

1
Angel Morales
Zemax Staff
2 years ago
Alberto.Donazzan
Ultraviolet
Alberto.DonazzanUltraviolet
posted in Got a question?

Zemax Error Message: Rounding digits must be between 0 and 15, inclusive. Parameter name: digits

I'm repeatedly experiencing this error while MC tolerancing:  Zemax Error Message: Rounding digits must be between 0 and 15, inclusive. Parameter name: digits The error looks independent of the number of runs, even though it comes out randomly for 200runs. The error always prompts at the very end of the MC tolerance analysis, during the last set of runs, regardless of the number of runs set. Design lockdown does not seem to have any beneficial effect. If of any help, by googling around this came up: https://pisquare.osisoft.com/thread/31742-calc-failedoutput-rounding-digits-must-be-between-0-and-15-inclusiveparameter-name-digits which sends back to a a 'frac' function, unable to handle input values that are smaller than 0.1.

7
Csilla Timar-Fulep
Zemax Staff
2 years ago
Thomas Magnac
Zemax Staff
Thomas MagnacZemax Staff
asked in Got a question?

How do you keep track of your optical systems during the design process?

There is no best approach to that question, I would just like to share with you my way of dealing with this, which is also the method that Joseph M. Geary uses and describes in his book ‘’Introduction to Lens Design’’. Because there is no versioning built-in Zemax OpticStudio, keeping track of the designs and their evolution can be tricky. It is very easy to lose track of how you got to a certain point indeed. Here is the protocol: -first 4 characters identify the system/project -5th character is a number to separate different design within the same system/project -6th character is the letter ‘’o’’ stands for optimization (I personally add ‘’p’’ for paraxial, ‘’s’’ for starting, ‘’t’’ for tolerance … as you like) -7th is a number which is the particular step of optimization -last is either ‘’a’’ or ‘’b’’, and stands for after or before the step For example, ‘’TRIP2o4b.zmx’’ is the Zemax file of the second design of a triplet system at the 4th step of optimization before the optimizat

5
Thomas Magnac
Zemax Staff
2 years ago
M
mleMonochrome
posted in Got a question?

How to use optimization function to collimate light in NSC mode?

Hi all, I would like to test a variety of lenses in a 2-lens Keplarian beam reductor. What is the best way to optimize this design to get the BEST collimation with the pair of lenses? I have used the optimization wizard with a variable Z-axis distance. The criteria settings are attached. Occasionally, the optimization function does not change the Z distance of the second lens even after I put it in an incorrect Z-position. Can someone please advise? Thanks!  

3
Hui Chen
Zemax Staff
2 years ago
J
Joachim.WietzorrekMonochrome
posted in Got a question?

Radiance: Angle Space vs. Position Space

My NS-system comprises 2 components only.   1. Source Rectangle x/y Half Width = 5mm; Cosine Exponent = 1; Power = 1W This is nothing else than a pure Lambertian emitter.   2. Detector Rectangle x/y Half Width = 5mm; 100x100 pixel; 0.001 mm behind the source This detector covers closely the Lambertian Emitter   The Power (P) of a Lambertian source calculates as: P = pi * A * NA^2 * L A: Area of source NA: Numerical aperture of source; NA = 1 for hemisphere L: Radiance   For L we get: L = P / (pi * A * NA^2); P = 1W; NA = 1; A = 1cm^2 L = 1 / pi = 0.318   Ratracing confirms this calculation for radiance in angle space:   Of course there is a very little amount of noise...   When I switch the detector from Radiance in angle space to Radiance position space, the result gets wrong by a factor of 2:   Now I am really puzzled: A pure Lambertian source has a constant radiance in both, angle space and position sp

3
Hui Chen
Zemax Staff
2 years ago

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