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mluninMonochrome

asked in Got a question?

Why do GRIN index profiles in NSC mode transmit less light with ray splitting at various refractive indicies?

I am doing some ray tracing through some simple GRIN lenses.If I take GRIN3.dll, depending on what I set to n0, I get different results for intensity with ray splitting on, and the ray passing through the center of the lens (so no bending occurring). Here is an example: n0 = 1, 100% transmitted n0 = 1.5, 96% transmittedn0 = 2, 88% transmittedThis occurs with all GRIN dll’s (not just GRIN3), and does not occur with simple ray splitting. It functions as normal without ray splitting on. This doesn’t make physical sense to me. Why is more light reflected from a light ray at normal incidence at higher refractive index without specifying any specific scatter model, split model? As a note, I do not have any scattering, volume physics, coatings, etc in these.It appears to be some kind of index dependent ray reflection? No idea why that is happening. Going out to more extreme refractive indicies, it just trends towards 0 slowly. A few other notes - Adding in coatings does not change transmissio

6 hours ago

mocquinSingle Emitter

asked in Got a question?

Dead link in the knowledge base

At the page of the knowledge base: How to add coatings and scattering functions to Non-Sequential objects – Knowledgebase (zemax.com)The link behind “leanr more” that directs to : https://www.zemax.com/pages/information-for-zemax-customers-using-solidworksis dead.

13 hours ago

ChristianSingle Emitter

asked in Got a question?

Astigmatism of tilted mirror

Hi,I tried to evaluate astigmatism of curved tilted mirror in sequential mode. Astigmatism is obvious, but Seidel coefficients are zero. Also in Merit Function Editor parameter “ASTI” returns zero. Maybe the reason is that Seidel coefficients ignore the coordinate breaks for tilting.Did not find any topic describing this fact.Does anyone have a solution for getting Astigmatism of focusing system with tilted objects?

492

2 days ago

CJ27Student

asked in Got a question?

Polarization ray tracing in non-sequential mode

Hello there friends from the Zemax community,Once again, I would like to ask for your guidance/help with something that I need to implement.I am interested in performing a polarization ray-tracing analysis in non-sequential mode. Let me explain a bit more about what my situation and setup is.I start from some FDTD simulations from where I extract far-field information (Here I model a single point emitter).Since I am assuming that there is no source of decoherence, from my FDTD simulation I am able to extract values of field components (Ex, Ey, etc) that match to a single wavefront surface. In summary, I have a point source for which I can extract the far-field information.Using these field components, I have managed to generate the Poynting vector and consequently used this information to set up a sequence of rays which I import into Zemax. In this case, for each ray I have the direction cosines and the relative intensity which corresponds to my previously calculated Poynting vector.In

261

2 days ago

prologue0773Single Emitter

asked in Got a question?

Importance Sampling Leads to Decrease of Rays in ROI

Hello I’m trying to implement importance sampling in a model in order to increase the amount of scattered light toward a certain region. I’ve read the documentation and the tutorial online as well as looked at the sample file provided https://support.zemax.com/hc/en-us/articles/1500005488461-How-to-use-importance-sampling-to-model-scattering-efficiently I’ve also looked at the sample file in: Samples\Non-sequential\Scattering\Importance Sampling Demonstration.ZMX In both cases above, the amount of scattered rays in a region of interest increases as is desired. However I have encountered the opposite where the amount of rays decrease. I’ve attached a toy system in which this is observed. Could someone please help me clarify what is going on? In this model I have two systems in one separated by a barrier. Each system as a source that scatters on a rectangle object modeled as a Lambertian scatterer. In the upper system I use Importance Sampling with a target sphere at the detector matchin

490

4 days ago

mocquinSingle Emitter

asked in Got a question?

How are created the "random" polarizations ?

When using polarization with “random polarisation”, how are the polarization created and assigned to the simulted rays ? Is there a 2pi random distribution that is sampled for each ray’s polarization state ?

220

6 days ago

Aaditya.SardaMonochrome

asked in Got a question?

Not enough memory for 3d Plate list even after having enough memory!

Dear All, I am getting not enough memory for 3d plate list error even after my System has enough Ram available. I have attached the screenshots. I was trying to do the stray analysis but unable to do due to this error. Please help me. Thanks,

523

6 days ago

Donna.WatersUltraviolet

asked in Got a question?

How to freeze NSC shaded model window (zoom and rotation)?

I want to fix the zoom, pan, and orientation of the geometry in my NSC shaded model, so when I update the position of one of the objects, it doesn’t change back to the default layout. Is there a way to do this?

412

6 days ago

Mike.JonesEn-Lightened

asked in Got a question?

What is going on in NSC Shaded Model?

Version 24.1 NSC Shaded Model hangs up big time, especially after I minimize it then restore it. No response at all to mouse or keyboard. I have to kill it and restart it.When will this bug be fixed? This is a BUG, not a feature. Please repair in an interim release.Mike

3149

7 days ago

Rahul ThakurSingle Emitter

asked in Got a question?

Design of prism

Hi, I want to design a schmidt prism in seq mode. How should I approach?

482

10 days ago

jsungVisible

asked in Got a question?

Best way to model volumetric scatter for diffusing dome or plate

We use volumetric diffusing plastic shell or plate for color mixing the LED array. The info from the vendor is just material and % of added particles like SiO2. Substrate is typical PMMA or similar plastic.Give just info like this what’s the best or simple way to simulate this in Zemax NSC? I’m thinking of Mie or H-Greenstein model but not sure how to set up parameters there with just info like this.

180

11 days ago

jsungVisible

asked in Got a question?

How to avoid ray error when placing source inside Boolean object

I created a TIR lens by creating two objects (one big aspheric lens and a smaller cylinder volume) and forming Boolean subtraction A-B to make void hole through the lens. This is typical shape of TIR lens for LED.Problem here is that Zemax makes error when ray source placed too close the lens in the region of aspheric lens volume although it’s where it is cut off by the cylinder volume. Normally we disable base elements of Boolean object. It works only if the ray source is placed outside the base lens volume. Is there any way to get around this issue in Zemax?

12315

11 days ago

ztystarInfrared

asked in Got a question?

How to set 'nits' as unit for detector in non-sequential mode?

Hi all,I have a question for detector in non-sequential mode. We often use ‘nit’ to evalute the display system, but I did not find how to change the unit to ‘nit’ for detector in non-sequential mode like LightTools did, so is there anyway that it can be directly displayed in Zemax or we have to export the data from Zemax and do some conversion?Thank you,Kaden

572

11 days ago

mpreciadoDark Energy

asked in Got a question?

Zernike standard phase. Coefficients 7 and 8 issue.

Hi, I have been tring to reproduce the phase produce by the Zernike standard phase, and I believe there is an issue with the terms 7 and 8, corresponding with vertical and horizontal coma. Theoretically they should be Z7=sqrt(8)*(3*ro.^3-2*ro).*sin(phi);Z8=sqrt(8).*(3*(ro.^3)-2*ro).*cos(phi); However, after a lot of headache I realized that they behave like:Z7=sqrt(8)*(3*ro.^3).*sin(phi);Z8=sqrt(8).*(3*(ro.^3)).*cos(phi); Ithought maybe it a different stardard, but in the original paper referred R. Noll, "Zernike polynomials and atmospheric turbulence", J. Opt. Soc. Am., Vol. 66, No. 3, p207 (1976)The definition is sqrt(8)*(3*ro.^3-2*ro).*sin(phi). It is pretty obvious noticing that radially is just a cubic term without the linear term when you represent the wavefront map. It does like the 7th (or 8th) order zernike represented in many places. This is very surprising. Anybody else noticed this issue?I am using Ansys Zemax OpticStudio 2023 R2.02.Thanks,Miguel ZEMAX 7TH ORDER ZERNIKE M

921

11 days ago

Donna.WatersUltraviolet

asked in Got a question?

Modeling a Bent Fresnel

Is it possible to to model a rotationally-symmetric Fresnel lens that’s bent into a cylindrical shape?If I understand correctly,Extended Fresnel doesn’t allow for a cylindrical substrate Cylinder Fresnel doesn’t allow for rotationally-symmetric Fresnel features Fresnel 1 & 2 require a flat substrateThanks!

250

12 days ago

Masahiro KitagawaSingle Emitter

asked in 質問コーナー

座標ブレーク挿入時のPOWP/POWFの振る舞い

添付ファイルのように、X, Y方向の屈折力が異なるレンズを光軸を軸として回転させる場合について質問します。メリットファンクションのPOWF/POWPオペランドで球面屈折力（Data 0）とシリンダ屈折力(Data 1)を表示させた場合、どちらも回転角に依らず一定の値を示すのが正しいと思います。しかし、実際にやってみると回転角88.6°付近で値が急激に下がり、そこから90°までなだらかに下がって0に近付きます。これは何か使い方が間違っているのでしょうか？　それともバグでしょうか？添付ファイルの例では、分かりやすいようにマルチコンフィグで0, 88, 89, 90°を設定しています。球面が0.5D、シリンダが1.0Dで一定のはずですが、MFEで見るとコンフィグごとに値が違っています。（近軸XYで試していますが、トロイダルでも同様でした。）

451

12 days ago

Sean TurnerUltraviolet

asked in Got a question?

New Export Ray Footprint to CAD feature does not seem to work

I was eager to try out this new feature in 2024 R2.02, but I don’t think it’s working properly. I tried exporting a simple file, one OAP mirror with 9 fields defined. When opening the file in SpaceClaim, I did not see any ray footprints on the mirror. I tried all 4 file type options, and none seem to do what I would expect. Can somebody explain the intended workflow and outcome here?Thanks,Sean

863

12 days ago

Mahmoud EldeebMonochrome

asked in Got a question?

birefringence calculations in 3d

Hello, I want to ask how exactly we can calculate the state of polarization in general 3d form or how zemax do it given the optical axis orientation n and the propagation direction of light k How the ordinary and extraordinary E are calculated in this case I think From k and initial polarization we calculate Ein and then Ee=(Ein⋅n)n Eo=Ein−(Ein⋅n)nEo experience no and Ee experience effective refractive index Where I can find some detail calculation steps ? Thanks

250

13 days ago

bdocMonochrome

asked in Got a question?

Control of back reflections during design process

Hello,I have some questions about back reflections analysis. To check a lens design for potentially dangerous back reflections I use the ghost analysis tool. However, after changing the lens design, I have to do this again and again. Is there a quicker way to check for back reflections during the design process, for example by using NSC?The only way I found so far, is to use “split NSC rays” in the 3D layout. However, I still cannot control the distance of the back reflection to the lens surfaces.Is it possible to define a minimum distance of the back reflection to each lens surface by using an operator? I’m only interested in single bounce reflections, double bounce can be neglected. Thanks in advance! Best Regards,Ben

470

14 days ago

mocquinSingle Emitter

asked in Got a question?

Non-sequential: Slider vs Visual Optimizer

I am having trouble understanding the differences between:the sliders in Optimize/Manual Adjustment/Slider the sliders in Optimize/Manual ADjustment/Visual OptimizerFrom what I understand, they both allow to create several sliders on various parameters and visualize their impact on the system.

411

14 days ago

OlivierSingle Emitter

asked in Got a question?

EXPP not exactly right? Why?

Hello,I am new here. I believe that the exit pupil is a plane where PARY (0,1) (0,0) is exactly zero (or a very small numerical error). However, in the simple example attached, I read EXPP = -25.26 µm. This difference from zero is bigger than a numerical error. Could you explain why the exit pupil is not exactly where is should be?Thank you,Olivier

561

18 days ago

CharlieGSingle Emitter

asked in Got a question?

Zernike Phase compensator issue in tolerancing script

I’m having some trouble running a tolerancing script in OpticStudio, where I continually get the “nominal criterion cannot be computed” error when I attempt to run the script. I’ve tracked it down to a CPAR compensator I’ve defined on a Zernike Fringe Phase surface. I’m attempting to use the phase surface Z9 term to null the system spherical for each Monte Carlo file in the tolerance analysis.I’ve confirmed the compensator is defined correctly (CPAR Surf# Param23), and I’m able to set the same parameter to a variable and optimize in the nominal design file, so I can’t understand why the tolerance script cannot implement this as a compensator. If I comment out the CPAR line, the nominal criteria evaluates and the script runs without issue. Can anyone explain why I’m unable to use this compensator?

1024

18 days ago

David.NguyenLuminary

asked in Got a question?

Feature Request: ZOS-API Layouts Exports Completion

One year ago, @Xianglei wrote a topic (thanks a lot!) about:Since its been quite painful to generate such plots with ZPL (thanks to @Erin.Elliott, we might get a fix in 2025 🤞):I’ve been using the ZOS-API option more and more to create animations. It is more stable, but currently lacks a couple of options. Since we’re approaching the Christmas period 🎅, this is my wish list to improve the ZOS-API Layout Exports feature (in order of importance):As far as I understand, we cannot specify the file type of the export. I’ve tried to use multiple extensions in OutputFileName (.JPG, .PNG, ...etc.) but the file size remains the same. Based on the file size, which is rather small (for a given image size), I’m assuming the export is made in .JPG regardless of the extension specified. Can the file type be added to the ZOS-API? Could we get a vector graphics file type? Although there’s a property RaysLineThickness, for me, it doesn’t seem to have an effect. If someone is anyway going to look at

964

18 days ago

whit2452Monochrome

asked in Got a question?

How to model interference pattern from diffraction grating

I have a simple system of a laser, pinhole slit, and diffraction grating and having trouble mapping the expected diffraction pattern. I have performed this experiment in real life, and can see the spots align 16 mm apart vertically after exiting the diffraction grating. I have moved my system to non sequential mode and ray traced, but the detector viewer continues to show one giant spot. Can someone please help me better understand what could be the issue here? I am using scattering surfaces.

551

18 days ago

jsungVisible

asked in Got a question?

Freeform Z object doesn't work for Boolean native?

I tried to do Boolean subtraction with Freeform Z object and cylinder volume in order to drill a cylindrical hole through the Freeform Z lens. But Zemax won’t make that boolean subtraction as I wanted.Is this bug or did I miss something here?

679

19 days ago

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