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2977 Topics
I
Indy.MagnusMonochrome
asked in Got a question?
Fiber tilt plotting/tolerancing in single-mode fiber coupling using Physical Optics Propagation

Dear all, I would like to investigate the single-mode fiber coupling efficiency using Physical Optics Propagation in function of the fiber tilt angle. I would like to use the Universal Plot to see its sensitivity, and afterwards see its effect during a complete tolerance analysis together with other tolerances (both in the RSS estimate as well as in a Monte-Carlo simulation). However, it seems that either using a coordinate break before the fiber surface, or using the ‘Tilt’ surface as the final surface (as was done in the angled-fiber article but without using POP) does not affect the POP fiber coupling calculation. The ‘tilt about X/Y (deg)’, inside the POP ‘fiber data’ can of course be used to set the tilt, but this value can (as far as I’m aware) not be used for plotting or tolerancing. Is there some other way to easily plot and tolerance this fiber tilt when using POP, without having to use a custom macro or ZOS-API code? Thanks for any input, Best regards, Indy

40
I
jsung
jsungVisible
asked in Got a question?
Scattering issue with Boolean object

I created a dome shell object by subtracting smaller sphere from bigger sphere and also removed the rear half with a big cylinder object. This is done with Boolean operation A-B-C (A: big sphere, B: smaller sphere, C: cylinder). Then I applied Gaussian surface scatter to both side surface (sig=0.25) to make some wide beam angle scatter like tis picture. But problem when the source is moved to Z=0 where the sphere half plane is, the scattering is gone. I guess this is caused by source being in the parent object region though parents are shifted away or disabled for ray trace. I tried moving source object below the Boolean object and entered boolean object number in “inside of” column, but that doesn’t make it work either. I had similar issue with Boolean before when I tried making TIR lens. It was found I should avoid putting the source at the boundary of original parent object or inside. But this scattering issue with Boolean seems like new to me. Any idea if this is a bug or there is

60
jsung
mocquin
mocquinVisible
asked in Got a question?
Grid of rays in Vignetting diagram

In the Vignetting diagram analysis, the doc states : “Ray Density The Ray Density specifies the number of rays to be traced. The more rays traced, the greater the accuracy, although the computation time increases. For a Ray Density of n, OpticStudio traces a grid of (2n+1) x (2n + 1) Rays at each Field Point. The Ray Density minimum value is 5.” It also mentions that “This feature is appropriate for rotationally symmetric lenses”. My qyestion then is how is the grid of rays generated with (2n+1)x(2x+1) rays on a circular pupil ? A square grid is generated, and the rays outside the inscribed circle are dropped before the ray tracing ? in other words, about (2n+1)*(2n+1)*pi/4 rays are actually used ?

60
mocquin
Mojmir
MojmirSingle Emitter
asked in Got a question?
Simulation partially coherent laser source

Hello everyone, I need to define a partially coherent source in Zemax, which I then want to homogenize using a light rod. The source parameters are: • Size: 32 × 14 mm • Divergence: 4 × 1 mrad • Coherence length: 0.1 mm I need to homogenize the beam using a rod to achieve a final beam size of 100 × 10 mm. Is there a way to properly define such a partially coherent source in Zemax? What approach would you recommend for modeling the homogenization process? Thanks in advance for any insights!

100
Mojmir
CJ27
CJ27Visible
asked in Got a question?
Inverted single aspheric system performance

Hello there friends from the zemax community, I was wondering if someone could give me some guidance with a situation I have. I have a finite conjugate system which images a single on-axis point to another on axis point. To perform this on-axis imaging, I have optimized a single aspherical surface. In object space I have a point with a half angle of 30 degrees and on the image side the cone of incident angles is equal to 6 degrees (half divergence). This is how my current system looks like: From this you can see that the on-axis performance is diffraction limited in this configuraiton. Now, I am interested in evaluating the performance of this system but on the reverse direction, i.e, I flip the entire system. Now I have a point source with a cone divergence of 6 degrees. This is how the system looks like: Oection the performance is far from ideal. In my opinion this is because in the forward case, even though the imaging performance is diffraction limited, the rays in image space do n

141
CJ27
Diptayan
DiptayanSingle Emitter
asked in Got a question?
Getting the Ray Spot diagram/Seidel Aberrations from interferometer data

Hi Everyone, I am trying to get the seidel aberrations and ray spot diagram for a surface of which I have only the interferometric data (captured by a zygo white light interferometer and processed in their MX software). I think I have successfully imported the data from the interferometer’s software to Zemax as the peak to valley sort of matches. But I am seeing no difference in the ray spot size and seidel aberrations. I am uploading the link to the files as it is a big one (both Zemax and interferometric data). Kindly help me or suggest what the issue is. Zemax File Thank you.

401
Rishab
ZemaxUser2020
ZemaxUser2020Single Emitter
asked in Got a question?
Question about double pass system in which mirror is tilted

Hi fellow Zemax-ers, I am looking to model an optical system in sequential mode with the following characteristics. I think this could be done pretty straightforwardly in non-sequential mode, but sequential would likely be more efficient. The optical system would have a series of elements after the object before hitting a 50:50 beamsplitter (and I am only concerned about the transmitted arm in this direction) After the beamsplitter, it would go through some series of lenses Then there would be a mirror that could be flat or curved that would reflect the light so that it would go back to the beamsplitter I would only care about the reflected arm after the beamsplitter After the beamsplitter it would go through another series of lenses before forming the image The challenge is I want to be able to tilt or decenter the flat/curved mirror (through different configurations) that reflects the light to form the double pass. I’ve looked at examples such as the 50:50 beamsplitter but that doesn

150
ZemaxUser2020
Donna.Waters
Ultraviolet
Donna.WatersUltraviolet
asked in Got a question?
Modeling an apodized aperture at a focus in sequential

Any thoughts as to how I can insert a radially-gradient neutral density filter at an intermediate focus? https://reynardcorp.com/wp-content/uploads/2020/09/Reynard-Corp_Bullseye-Apodizing_Datasheet.pdf Ultimately, I’m trying generate PSFs that account for diffraction at the aperture. Thanks!

261
Donna.Waters
Ultraviolet
yfei
yfeiMonochrome
asked in Got a question?
Dichroic Mirror in NSC mode Ray Tracing

Hello, I have a question similar to post “dichroic mirror in NSC mode”. In that question, the supplied example is not in one single configuration, which the emitted light and the excitation light are seperated. I am having trouble simulating the same configuaration but with one dichroic mirror. I followed the example “How to model fluorescence using bulk scattering”, but the coating on the dichroic mirror does not seem to function on the back surface (Sample side, Green in the figure). Even if I put a reflective surface at the back surface, the incoming ray (black in the figure) from the source side will hit that surface and reflect away. How should I avoid this sitation? I would like to have the source sending ray transmitting through a 45 degree dichroic mirror, hitting the sample, reflect back to the other surface of the dichroic, and reflect to 90 degree respect to source (upward in the figure). Is that possible? It seems to be an easy task, but I don’t have a solution. Thank you f

523
David.Nguyen
Luminary
Daniel Stephan
Daniel StephanSingle Emitter
asked in Got a question?
Circle of tilted rectangles

In non-sequential mode, I’ve created a circle of rectangles arranged around a light source (not shown). I’ve used the Paramter “Tilt About Y” to orient the rectangles’ faces toward the center. Now, I’m trying to tilt the rectangles 10° toward the central axis, but I’ve only been able to achieve this for objects #4 (highlighted) and #10. When I attempt to tilt the other rectangles forward, e.g. object #1 (centered in the screenshot), all I can accomplish is to rotate the rectangles clockwise or counterclockwise. Changing the values in “Tilt About X” and “Tilt About Z” seems to have the same effect. How can I make all the rectangles tilt towards the center, just like #4 and #10?

502
Daniel Stephan
Alberto.Donazzan
Ultraviolet
Alberto.DonazzanUltraviolet
asked in Got a question?
A trivial issue: Solve column label not visible when selected

As per title, when selecting a specific row in the LDE the Solve column label is not visible (black on black instead of white on black). I am using release 2025R1.

322
Sven.Stöttinger
HCY
HCYMonochrome
asked in Got a question?
Blanking out LDE parameters in a UDS

In some surface types (e.g. ABCD or Conjugate), the standard parameters (e.g. Radius and Conic) are ‘blanked out’. A value entered into those cells is instantly erased returning the cell to blank. Can this behaviour be programmed in a UDS? CY

280
HCY
John.Hygelund
Fully Spectral
John.HygelundFully Spectral
posted in Got a question?
Feature request: add coating name to ray database viewer

I would find it very helpful if the face coating could be added as an option in the ray database viewer.Also, calculating the relative intensity from the prior surface is quite handy. An example made in excel is shown below. Thanks for considering! -John

120
John.Hygelund
Fully Spectral
Athul
AthulMonochrome
asked in Got a question?
How to bring Feld curvature to zero for a 4f setup.

In my optical setup, I have a standard 4f setup with plano-convex lenses with focal lenght of 300mm . After focusing it, I found out that i have a huge field curvature. To reduce this i designed a setup with two sets of planocovex lenses with focal lenght of 600mm (to have almost the same propagation lenght of 1200mm) thereby reducing the petzval field curvature. Eventhough the field curvature was reduced by a factor of 3, the field curvature is still signinfiact. The 3rd approach was to design custom lenses. I was working with 2 pair of lenses and was using REAR and FCUR to reduce the field curvature. When i look into the seidel graph there is no field curvature. But when i focus it using a paraxial lens, i can see there is noticable field curvature. Is there any was to reduce this further atleast lower than the half of the rayleigh length.

180
Athul
B
Bianca.RöhrSingle Emitter
asked in Got a question?
Understanding the Method behind Huygens PSF

Hello everyone, I'm interested in finding out more details on the Huygens PSF method. The OpticStudio Help claims that 'a grid of rays is launched through the optical system'. Here I would like to know, what algorithm is used for the actual propagation. How are the abberations of all optical components accounted for? Are they propagated as rays, by paraxial propagation or by actually using Huygens formula? It would be very helpful if anybody could clarify this detail. Thanks a lot in advance, best wishes

218714
G
Baran.4
Baran.4Monochrome
asked in Got a question?
Mixed Mode

Hello everyone, I am trying to design a system in Zemax using both sequential and non-sequential modes, but I am encountering errors and vignetting. What steps should I take to eliminate these issues?

300
Baran.4
Mel
MelSingle Emitter
asked in Got a question?
Zemax Error Message when trying to save an image of an analysis window

Hi all, I receive this error message when trying to save an image of an analysis window. I recently installed the latest OpticStudio release. Any ideas how to fix this?

581
navreen.kaur
Zemax Staff
John.Hygelund
Fully Spectral
John.HygelundFully Spectral
asked in Got a question?
Viewing a subset of non sequential segments

In non-sequential mode, is it possible to view only a portion of the segments of a ray? I’d like view only segments after hitting a particular surface. You can filter by hitting a surface, but it always displays the entire sequence of rays. The functionality I’m after is similar to specifying the ‘First Surface’ and ‘Last Surface’ in the sequential viewers. Thank you, John

603
Bozkov
jsung
jsungVisible
asked in Got a question?
How export sequential lenses with rays to CAD file

Not sure if this topic was discussed before, but I haven’t found it yet. Sometimes I need to export lenses to CAD file (STEP or X_T) including ray bundles for each object field. What is proper setting for having rays that can be viewed in program like Solidworks? For example I tried the setting below, but this STEP file didn’t display field cone rays in SW. Regards JS

562
Y
Z
ZYSingle Emitter
asked in Got a question?
How to extract MTF data from multiple lens configurations?

Dear Optical Design Fellows, I used Tol Script to tolerance the lens. The lens tolerance is completed at nominal object distance and I need to pull out lens MTF data at other object distances/configurations with Tol Script. Is there an way/ a command in tol Script to extract lens MTF data at other object distances/configurations after tolerancing at nominal distance? Specifically, the lens is completed tolerance analysis at object distance 1000mm, and I want to pull out MTF data at object distance at 500mm and Infinity using tol script. Is there a way to pull out the lens MTF data with Tolscript command? Regards, Zhisheng Yun

301
Z
Daniel P. Calero
Daniel P. CaleroInfrared
asked in Got a question?
Phase retarding Mirror

I am trying to define a Phase Retarding Mirror in NS mode that transform diagonal polarized light into circular polarized light. We managed to create a working model using Arp Ars on the coating definition, but if I rotate the mirror on the Z axis, there is no change on the outgoing polarization state. Is there a more accurate way to define the retardance of the mirror?

614
Daniel P. Calero
Yujie
YujieStudent
asked in Got a question?
Clarification on AXCL Computation and Chromatic Focal Shift in Zemax

Hello Zemax Community, I’m trying to understand the meaning of the numerical value displayed in “AXCL” and how it’s calculated. The definition I found states: “This is the image separation between the two wavelengths defined by Wave1 and Wave2,” but I’m still unsure how to interpret that in practice. In my lens design, for example, the maximum focal shift is around 256.0465 µm, yet AXCL shows a value of -0.044014. I’m not sure what the negative sign means or why AXCL is so much smaller than the focal shift I see elsewhere. Is AXCL supposed to represent the chromatic focal shift, or is it defined differently? Any clarification on how AXCL is computed and what it physically represents in an optical system would be greatly appreciated! Thank you in advance for your help and insights.

732
Yujie
Baran.4
Baran.4Monochrome
asked in Got a question?
Issue with Controlling Image Plane Height

Hello everyone, How can I control the image plane height in an optical design? I am trying to determine it using the REAY operand, but while it works in some designs, I don’t always get the desired result in others. For example, in my design, the image plane semi-diameter is 0.2, but the Hy value I get using the REAY operand is 0.167, and the Py value is -0.012. However, I have noticed that this method does not always work consistently. What is the most reliable way to directly control the image plane height in this case? Are there any alternative methods I can use? Thanks in advance!

662
Baran.4
Ponderosa_Optics
Ponderosa_OpticsSingle Emitter
asked in Got a question?
Trouble Inverting a Fresnel

I have an odd application that requires a Plano/Fresnel lens collimator, with the Fresnel surface located on the Focus-side rather than the collimated side as is most common. My steps for setting up the model were as follows: I started out with a normally oriented (albeit janky) setup with the Fresnel lens set as an Non-Sequential Component in Mixed Mode. Next, I rotated the lens 180 about X to get the Fresnel surface on the Focus-side Lastly, I inverted the Radius of the Fresnel1 surface to get the rays to converge to a rough focus. When I flipped the sign on the radius, I received an error message conveying that my Exit Port surface has been missed (also illustrated in the 3D viewer, where rays stop at the Exit Port). I also tried replacing Step 2 above with inverting the Thickness on the Fresnel1 surface, but received the same error message. Honestly haven’t worked in Mixed Mode much, so it is probably something simple that I’m missing. Any guidance it greatly appreciated. Step 1 -

450
Ponderosa_Optics
Anthony
AnthonySingle Emitter
asked in Got a question?
Multiple Pressure Enviroments in a Single Configuration

Hello, I am having an issue with defining multiple pressure environments in a single configuration. I have seen other folks ask a similar question on this topic in the forum before but I seem to have ran into an issue that I can’t seem to resolve. I am using Zemax version 2024 R2. For the following configuration I have 8 surfaces (see images). I want surfaces 0-3 to be in a 1 ATM pressure environment. I then want surfaces 4-7 to be in a 0 ATM environment. I use the multi-config editor to set this up. I first add a PRES operand to define a 0 ATM environment. I then list GLSS operands for surfaces 4 to 7 to state that I want these surfaces to be in the 0 ATM environment. I then add another PRES operand set to 1 ATM. My understanding is that this will set all other surfaces not listed in the MC to 1 ATM (surfaces 0 to 3). This final PRES operand also defines the global system pressure as seen in the environment tab in the system explorer. What’s odd to me, is when I look at index of refra

863
MichaelH
Ansys Staff

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