Hello, I wanted to ask the community if anybody has simulated Fabry-Perot cavities and how the problem was attacked. Probably Im lucky enough to discover a straightforward way here in MyZemax   Thanks

Hello all,I have a valid key for Zemax 2015. when I want to use this key in other computer with more powerful CPU, It asks me license code.Where can I find this code?I sent two emails to Zemax support section but still no reply.Does someone know about this problem and its solution?Thanks in advance.Regards,Behzad [Mod edit: Moved to appropriate forum (Licensing and Installation)]  

Dear experts,  I’m designing a mode-matching telescope that uses only a concave and convex mirror. I have two questions about handling the gaussian beam in zemax. 1. The too large waist size and waist location deviationCurrently, I’m using skew-ray gaussian beam analysis and POP coupling to check the design. My design has ~3 degrees of incident angle to the mirror, so astigmatism of the gaussian beam occurs. But deviation of waist location is too large than expected in skew Gaussian beam analysis. in ray transfer matrix analysis, astigmatism of the curved surface is described like this. Image from wikipedia “Ray transfer matrix analysis”COS(3degree) is about 0.9986…~1 so I think the incident angle of my telescope will make small amounts of gaussian defocus. but zemax skew analysis shows ~40mm of waist position displacement.  I can't tell if I made an error in optical theory or if I made a mistake in the initial setting of the simulation of the zemax program. Changes in Gaussian beams i

Hi,If I have a sequential mode system which have a bunch of optical elements, for instance, from surface 1 to surface 100, and I would like to setup portion of the whole system , for instance, from surface 30 to surface 45 as a subsystem (suppose there is an intermediate image after surface 45), I don’t know what information I should get from full system in order to setup the sub-system for ray tracing?  Thanks,Ying 

I’d like to save my OpticStudio files as .zmx by default to preserve compatibility with older versions of OpticStudio that my colleagues may be running. Manually saving .zos files as .zmx is functional but tedious - will the feature to change default save type ever be added? Thanks!

 there is no change in Lens performance before and after the reverse when the double Gauss lens provided as a sample in zmax is reversed, When the lens for the mobile phone was reversed along the guide below, the lens performance deteriorated.I think cell phone lenses have a lot of Aspheric Coefficients. In this case, does lens reverse cause deterioration in performance?https://support.zemax.com/hc/en-us/articles/1500005575602-How-to-reverse-an

Hi,I have to get the centroid coordinates from the huygens PSF analyse. At first, I tried to get the values from the text file itself, but it was taking way too much time for what I had to do. I decide to get the merit function operand value CEHX/CEHY instead, but the values from the text file and the ones I get from the merit function are slightly different. I was wondering why and if there was a way to correct that difference. Thank you !

In the Help file, we can find the following description.The Setup Tab > System Group (the Setup Tab) > System Explorer > Polarization (System Explorer) > Defining the Initial Polarization These can be visulzied as below. The pythone code to draw is this provded for reference.Enjoy!

these operands appear to return the same information. is the only difference one set is for a specific field (cenx\ceny) whereas one set is for an arbitrary field (cnpx\cnpy) or am I missing something else?

Hi all, I was hoping someone would clarify if the problem that I encountered is an actual bug that need fixing or if I’m just doing something wrong.I designed a volume hologram using “Hologram 2” surface, and when replaying it with multiple beams, the first one the one that’s been designed for and then adding in the field editor +-2 and +-10. Then on the “Diffraction efficiency vs angle” analysis, im selecting different fields but it shows the same unchanged plot, which cannot be because if you replay a VHOE that has been recorded for let’s say 45 degree but you are in this case 2 or 10 off, depending on the angular selectivity curve it’s maximum DE should be lowered.But as you can see on the image, the field 5 (corresponding to +10)  shows almost 100% efficiency, which is very unlikely.Thanks in advance,Jorge. 

Hi all, For a set of collimating lens that I designed I got good enough MTF but  the image is out of focus:- What can be the reason for this phenomenon?-Furthermore, changing the refractive index from “fixed” to “mode” casue a degradation of the mtf!what happend here? Thanks,Nadav​​​​​​​​​​​​​​ 

Does “make double pass” work with black box files? (sequential mode)I have a microscope objective as a black box file. I want to focus a laser on a mirror using this objective and recollect the light using the same objective (black box). After the reflection, all thicknesses are negative. I think this makes a problem for the black box file.Thanks,Stephan

Hey Zemax team,You know I love you guys dearly, but the 22.2 OpticStudio release seems awfully light. Two features only, one of which was in the 22.1 release?Looking forward to a bumper 22.3 release!Mark

Hello everyone, I want to model a system that has three assemblies at different temperatures and pressures. Additionally, each group can vary in temperature inside a specified range. Can this be modelled in Zemax and how? The way I tried it turned out to be incorrect. I focused each assembly separately under its nominal condition, joined them in one file, and created 3 configuration thermal analysis. Then in MC editor, added temperature and pressure in front of first surface of a given group, expecting to get a nominal configuration to be focused, but it was not. Can someone help me telling me how this can be modelled please? Thank you very much, kind regardsBiljana

This thread is dedicated to the upcoming webinar: Using and Modifying CREO Parts with OpticsBuilder. Any questions received during the webinar will be responded to as a reply on this thread. Feel free to post your own questions! The speaker will be notified and will respond as long as the thread is still open.Be sure to subscribe to this thread if you want to see additional discussion regarding this webinar topic. The thread will be open to new replies through Friday, June 3rd. [The webinar has concluded.] Webinar detailsDate: Thursday, May 26thTime: 6:00 - 7:00 AM PDT | 11:00 AM - 12:00 PM PDTPresenter: Flurin Herren, Application Engineer II at Ansys ZemaxAbstract: In an optomechanical workflow it is quite common that a system needs to be edited during the design process due to added information or changing circumstances. At certain stages of a workflow only specific things can be edited. This requires a tool that can edit more than one specific group of properties at a time. OpticsBu

Hi, just a simple question. Is sodium fluoride (NaF) in the catalog or should be implemented as a nre material? Thank you in advance

Hi,I was reading the tutorial page https://support.zemax.com/hc/en-us/articles/1500005578722-Simulating-diffraction-efficiency-of-surface-relief-grating-using-the-RCWA-method.It mentioned that, for the user defined grating (srg_user_defined_RCWA.dll), we can have multiple sections within one layer. I tried to write multiple sections in a .txt file but the RCWA module will only show one section. For example, if there are three bars with widths a,b,c within one period for one layer, separated by gap g, as shown in the figure below. How should I write the .txt file. Thanks.

Hi everybody,i optimized an aspherical lens with circular aperture (radial symmetric). Now i wand to cut both sides of the lens and reshape it. I used the rectangular aperture(Lens data → Aperture → Aper Type) shape, but then the shape in shorter axis was changed.Is there any way to reshape the lens after design?Regards,Ata 

Hi dear,I just found a problem related with chromatic focal shift in my ball lens design. When the pupil zone is set to 0, it is a very small number, while it can be extremely large when the pupil zone is set to 1.  Is there something wrong with it ? Which value should I trust?I tested it on Zemax 2017 and 2019, but I lost my license recently, so I can not test on the lateset version.I also attach the zmx file for your testing. Thank you Oliver 

Topic: Creating a user-defined surface using DLLsLive solution reveal and Q&A: May 19th, 8am - 9am PDT (See the attachments for a calendar invite.)Engineer: @Sandrine Auriol - Lead Application Engineer at Ansys Zemax This month, Ask an Engineer looks a little different! Give the challenge a try to learn more about DLLs, then come back on May 19th to discuss! Submit your solution or questions as a reply to this thread. Challenge opens: May 2nd Submit your code as a reply by: May 18th, EODChallenge:  OpticStudio surfaces are typically represented with continuous curves - either given by a smooth sag equation, or a spline which connects individual sag points. However, discrete steps may be needed to best represent an optical surface. For example, when manufacturing an optic with a 3D printer or lathe, the tool may generate the shape through the use of different zones of sag data, instead of a smooth profile, and you may want to represent a rough first-pass prototype in your simulation

Hi,I would like to calculate the chromatic focal shift using ZEMAX macro. I know it is related with the back focal length and different wavelengths. However, I did not find such numerical functions or operands to do raytracing and get the back focal length.Could anyone give any hint?  Thank you. Oliver 

Hello. I want information about how to create and optimizate a projection system with two or three lenses. Every time I try to use one model already done I can not find a good solution (I am a begginer), each parameter I modify the merit function is not computable or the result have a big RMS spot size. I would like to have a document which creates the lens from zero and explainning all the steps.   Thanks

Hi I’m senior in InHa university.I want to make a head light which uses laser diode.So I made this model, and I want my laser diode to be scattered. So I made a lens which functions as scatterer.But how can I GET THIS LENS TO FUNCTION AS A SCATTER-ER? Always- thank you for your support.

Hello there,I am a student who is working on an optical design. I have completed the design and wanted to do the ray tracing for it in Zemax. However, when I inserted the surfaces and saw the 3D view, the light rays did not propagate through the imported CAD file and stopped at the beginning of the shape. I realise that the image plane also coincides with the imported body and U am unable to modify the image plane thickness. I am just beginning to learn Zemax and am currently stuck in this situation therefore I ask you to kindly help me out.SetupThe 3D viewLight stops here

I was looking over the Drawing specific rays in layout plots – Knowledgebase (zemax.com) page and I cannot find the {Zemax}\Miscellaneous directory and have no “RAYLIST.TXT” file on my computer. Has the directory or file been changed in the Zemax version I am using (Zemax Optics Studio 31.3.2 Professional)?