Skip to main content

Got a question?

Can't find the answer you need? Ask your peers!

  • 2,830 Topics
  • 7,788 Replies
2830 Topics
A
Amit Kumar.DubeySingle Emitter
asked in Got a question?
Zemax file is not opening

I  am trying to open zemax file. It could not able to open and pop-up error message. Attached file shows the steps, i have taken. Please suggest me solution for it.

5731
S
Luminary
3 years ago
BBangun
BBangunMonochrome
asked in Got a question?
Tolerance analysis knowhow bases on Energy

Dear All.I wonder if it is possible to analyze the amount of incident energy according to tolerance through Criterion's 'Merit Function' or 'User Script' in the SC rather than the NSC during tolerance analysis. (I want using Monte Carlo Simulation)Energy is important because the amount of incident light determines the performance of the optical system.Energy change due to AR coating repeatability is considered separately.Thank you in advance. 

4193
S
Luminary
3 years ago
D
Daniel.LiuInfrared
asked in Got a question?
How can I get the OPDC through Raytracing without calling the OPDC function of ZEMAX?

I want to understand how the OPDC built-in function in ZEMAX is calculated, and I hope to reproduce the OPDC calculation through ray tracing and programming or other methods.The focus of the question is the specific operation method. I already know that opdc is the subtraction of the reference sphere and the backward tracking distance.I would be very grateful if you could answer!Sincerely，Nancy

1111
S
Luminary
3 years ago
A
Alex.DornSingle Emitter
asked in Got a question?
Calculation of the EXPD operand

Dear OpticStudio community,I was wondering whether anybody could comment on the following context.I’m using a microscope objective model with an NA of 0.95 in air, where the high NA side is located in the object space. The aperture type in the software is defined as object-side NA. Also, ray aiming (real) is on to equidistantly sample the aperture stop.I’m interested in the diameter of the exit pupil (ExP), because there I want to extract the optical path difference relative to the chief ray with rays that equidistantly sample the exit pupil. For this purpose, I have to remap the rays in the aperture stop so that the condition to sample equidistantly the ExP is fulfilled.Here I run over the fact that the 2x paraxial ray height at the ExP plane from the merit function editor does not match the operand EXPD.So my question is how does the software calculate the EXPD operand and why I might get that differenceThank you very much in advance.Alex

2082
A
3 years ago
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

189613
D
3 years ago
Ö
Fully Spectral
Önder.SönmezFully Spectral
asked in Got a question?
Sag Table import

Hi everyone,I have a sag table with a couple of rows, I want to insert the corresponding aspheric terms into ZOS lens editor.How can I achive my goal?Any help is appreciated.

7336
Ö
Fully Spectral
3 years ago
amarandi
amarandi
asked in Got a question?
Turning mirror in NSC

Hi everybody,i  put an turning mirror (==like fold mirror in SC) in my optical system in NSC. I realized this with rectangle object ant mirror material under 225° tilt about x. But the following optical parts( 2x lenses) after turning mirror now are off axis and parallel to turning mirror. I corrected that again with 45° tilt of next following lens. Only problem is now, that all optical parts after turning mirror are all off axis. Is there any option like fold mirror (in SC) in NSC?thank you in advance.

4351
Csilla Timar-Fulep
Zemax Staff
3 years ago
M
Martin.JahnMonochrome
asked in Got a question?
Modelling an ellipsoidal volume in non-sequential mode

Hello,I just tried to create an ellipsoidal object in the non-sequential mode. I’m using OpticStudio 18.4.1. The only way I found is to use a FreeformZ object. Isn’t there a more straight forward solution? Like the toroidal or rectangle volumes.Thanks in advance and with best regards,Martin Jahn

4244
M
3 years ago
F
Fatemeh.Jessen-HansenInfrared
asked in Got a question?
PSF broadening and beam width estimation

Hi, I am looking at a pint source, star, with a telescope system and I would like to understand how much my PSF broadened and what is the size of the observed point source on my detector. I am not sure what is the best approach to do this, as I get different results trying different type of methods for analysis. Method1: paraxial gaussian data. I set the input waist same as aperture value, as the input beam in collimated. Final value is 8.8mm beam size and beam waist of 5.5e-4mm. Looking at the PSF plot I donot see the 8.6mm. looking at the geometrical enclosed energy at above 85% energy, it is above 70um which does not go together with the beam size or beam waist estimated by paraxial beam. Method2: Hygens PSF or FFT PSF cross section. They are much lower and not sure if they give a correct estimate when my system is not diffraction-limited. Method3: Physical Optics propagationI defined the beam as top hat with beam waist of aperture diameter for collimated entrance beam.Beam size and

5342
F
3 years ago
Luca.cellerino
Luca.cellerinoVisible
posted in Got a question?
Define transmission in material data

Hi all,I need to define the transmittance of a material and I have as input the emission of the source in terms of CIE 1931 x, y and as output the measurement with the same standard.Inserted the values in the Source Spectrum Plot of OS, I obtained the spectrum for 100 wavelengths of both the source and the target.How can I combine the weight of each wavelength to generate the absorption values to be included in the material catalog?I attach the Excel file used for the calculation. Thanks in advance.

1411
Sean.Lin
Zemax Staff
3 years ago
R
Rick.VleugelsInfrared
asked in Got a question?
Laser focal spot size vs Airy disk

I don’t know if this is the right place, but there are probably people here with a lot of experience that may answer this.I’m trying to model a laser system, where I want to know the focal spot size of the laser.For this there is a standard, generally used formula: (M² * focal length * wavelength) / (pi * aperture). For parameters 980nm wavelength, 330mm focal length and aperture 20mm, this gives 20,6µm.For the Airy disk radius, the formula is (1.22 * wavelength * F/#). For the same parameters, this gives 19,73µm, which is also what I get from Zemax. This means the Airy diameter is 39,46µm, which is about twice the size of the focal spot size calculated with the generally used formula to calculate the focal spot size.So I am wondering what is the difference here? 

15792
R
3 years ago
F
Fatemeh.Jessen-HansenInfrared
asked in Got a question?
How to analyse irradiance versus total power in geometrical image analysis

Hi,In my spectrometer design, I want to understand how much percentage of incoming power will be detected at each wavelength and if that is above sensitivity of my detector. I have used the geometrical image analysis for that. However, I cannot make sense of the numbers here.If the total power through the entrance pupil is 9e-15 over the 3mm width of the detector (which covers 250nm to 350nm wavelength) with 231pixels in each axis (sice the detector pixel size is 13um), I donot understand how come the irradiance power at each wavelength is higher than the total power! I assume image width is only in the width in x-axis or y-axis. let me know if that is also not a correct assumption.   I  set the total power to 1(equivalent to 100%), to have the outcome of the irradiance in fraction of Watts/mm^2, but I have the same issue.  Secondly, I would like to know when my detetcor is not along global Y-axis, looking at the Cross Y is correct. Meaning is the Cross X and Cross Y in the image analy

8322
F
3 years ago
M
mcagigasSingle Emitter
asked in Got a question?
Scattering from particulate contaminants

Hi, All surfaces have some amount of particulate contamination (i.e., dust) that increases their BSDF above the level predicted by their surface roughness. It happened in a clean room when we are aligning a optical system.I would like to simulate this scattering using a MIE model, for that I need to give mie properties to each optical surfaces (mirrors in our system).is possible to give mie properties to each mirror and evaluate particulate contamination?Best regardsMiguel

3011
Sean.Lin
Zemax Staff
3 years ago
J
JessicaMonochrome
asked in Got a question?
POWF and POWP calculation,

It seems to me that when Zemax calculate POWF or POWP, it doesn’t take into account of wavelength. Is that the case? The POWF or POWP should be varied with the wavelength, I tried to see it in the merit function editor and using ZPL programming, both of them gives me the same results. IS this the bug with the software? Thanks, Jessica Zheng

992
J
3 years ago
G
Gary.HalamaSingle Emitter
asked in Got a question?
Tolerance analysis

For the RMS spot size criterion, what default field points does it use?  Can they be adjusted without using merit function criterion?

781
Mark.Nicholson
Luminary
3 years ago
D
Daoming.DongInfrared
asked in Got a question?
Measuring distance between surface while changing decenter

Hi all,I’m new to Zemax, and I’m struggling on finding the exact distance between surfaces. I understand that normally the distance between surfaces depends on the thickness that has been set in the lens data editor. However, in the off-axis system I’m designing at current moment, I found that applying Decenter Y will change the distance between surfaces. Now, I’m using the measurement tool to find the distance between surfaces after applying decenter Y. Is there any other method to tell me the accurate distance between surfaces? Thanks in all in advance. Daoming

11453
D
3 years ago
G
Gabriele.MarchiVisible
asked in Got a question?
Donut Shaping and Propagatinga Gaussian Beam with POP

Dear all,I am Trying to generate and propagate a Donut beam using axicons. My problem is thaht when I use the POP tool the beam “disappears” after the first axicon surface, Namely before the axicon I see the gauss which propagates, after the axicon I see only a blue field with a red pixel in the middle. Noone as Idea what is gong wrong and haow to fix the problem to see the beam evolving during its propagation?I attach the file to give you the possibility to have a look.Best regardsGabriele

4223
S
Luminary
3 years ago
Buddy
BuddySingle Emitter
asked in Got a question?
how to realize "image simulation" by ZOS-API Matlab programming

Please do me a favor. Zemax has the function "Image Simulation". I can do this interactively. Now, I want to use "Image Simulation" to simulate 2000 frame images. Therefore, I want to use SampZOS-API Matlab programming to automatically do it.  I have learned the code ZOS-API\Sample Code\MATLAB\MATLABStandalone_04_pull_data_from_FFTMTF.m" to acquire MTF curves. Would you please tell me how to program codes. The codes can realize to load, simulate and save 2000 frame images based on "Image Simulation" moduale. It would be appreciated if you could reply me as soon as possible.

1341
S
Luminary
3 years ago
Amelia
AmeliaSingle Emitter
asked in Got a question?
How to calculate diffraction with a CAD model?

I am trying to simulate light incident on a semiconductor sample underneath an AFM tip. The AFM tip has micron-scale dimensions, so diffraction will occur. I have created a CAD model of the AFM tip in Solidworks and imported it into Zemax as an STL file. I am not sure how to set up my Zemax project to calculate diffraction around the AFM tip. I would appreciate it if someone could point me in the right direction.The CAD model and Zemax project are attached here. Thank you!

450
Amelia
3 years ago
F
Fatemeh.Jessen-HansenInfrared
asked in Got a question?
Merit function weigth definition and optimization issue

Hi, I would like to understand better how to define the weigths for the merit functions. I usually put 100 for things care more, or 10 for the things needs to be closer to certain value and 1 for values that needs to be further away. Can I ask to get help in understanding how to define weigths for the parameters and what is the maximum.I have following issues, which I would like some help regarding it:Optimizing for GPBS will increase the rms spot size drastically, not sure why and what to prefer?FICL: Why increasing the Sampling will change the value?  Shouldn’t the value converge?Cannot run the hammer optimizer using local merit function due to Insufficient sampling. What to do for maximum enclosed energy optimization?Br,Fatemeh

10343
Mark.Nicholson
Luminary
3 years ago
F
Fatemeh.Jessen-HansenInfrared
asked in Got a question?
Merit function, secondary focal point optimization

Hi, I have a system which I would like to optimize with low rms spot size. However I would like to keep the beam collimated where the arrows are pointed. I am not sure how to setup the boundary conditions in merit function.Thank you in advance.Fatemeh

2133
F
3 years ago
F
Fatemeh.Jessen-HansenInfrared
asked in Got a question?
y-real definition and spectrograph resolution

Hi, I am in doubt how to understand y-real and also Cross-y in image analysis of the tilted system.I have used a code to generate spectrometer resolution for the tilted detector like below:In the ZPL code I used “yf = RAYY(Last_surf)” for determining my y position. However I am not sure I understand if RAYY is the correct one to use to show the position of the beam on the image plane and calculate the resolution or I need to multiply that by the cos(angle).Also, I am trying to use the geometrical image analysis for looking at the beams in different wavelength to see how resolvable they are by choosing 5nm resolution and how wide the beams are. I would like to know if that is the way to go. In this case I also used Cross y and I am in doubt what is the coordinate and if this is along the image plane.  Thank you in advance,Fatemeh

904
F
3 years ago
F
Fatemeh.Jessen-HansenInfrared
asked in Got a question?
Glass material update, dpgF

Hi I am uncertain how to implement a new material in Zemax. I wanted to include UV fused silica:However I cannot understand what to put for the marked parametersThank you,Fatemeh

16032
F
3 years ago
Y
Yoshikazu.KawamataInfrared
asked in Got a question?
To find optimum number for smoothing in detector viewer

Hello, I understand that irradiance in NSC simulation result and in the real world has a gap because real world has infinite number of rays and simulation uses limited number of rays.So, I usually use maximum number for smoothing to make the gap small.But I also think that smoothing(averaging) could lose accuracy.Hence, I think I need to balance out between “smoothing” and accuracy of result, based on number of rays in a detector.If the detector has enough number of rays, smoothing may not be necessary.For instance, every pixels in a detector has a ray, smoothing may not be necessary to get the result for the smallest gap to the real world.Understanding those, I am wondering if there is a criteria or a guidance for getting an optimum number of smoothing.Does anybody know that? RegardsKazu 

5506
R
Ultraviolet
3 years ago
M
MARI CARMEN.ROMERO ALVAREZSingle Emitter
asked in Got a question?
Top Hat configuration

hello.I have to analyze the diffraction losses in a baffle collimator. to simulate a beam coming from infinity i have used the top hat, is this correct? i want to analyze the diffraction losses of each baffle. suggestions for the beam configuration?

1440
M
3 years ago

Badge winners

Show all badges
Community Posting GuidelinesCookie settings