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Jiawei LIUSingle Emitter

asked in Got a question?

Can grid sag surfaces be used on object surfaces(surface 0)?

I tried to change the object surface type to grid sag surface and imported the grid surface data, but the surface sag map did not change. When I imported the grid sag data to any other surface, it was displayed normally, so I am a little doubtful whether grid sag surfaces can be used on object surface(surface 0)? If not, is there any other way? I want to analyze the imaging results of a complex target surface after passing through a certain optical system. Can adding a grid phase surface after the object surface achieve my goal? if yes, How to convert the grid sag surface into the required grid phase surface?

231

5 hours ago

jsungInfrared

asked in Got a question?

How do I know total number of rays in the new ray file?

As per title. I’m not sure if this was asked and answered before.Is there easy way to figure out total ray numbers of the ray file before tracing it?

414

6 hours ago

jesusmunozjmjSingle Emitter

asked in Got a question?

Array type on sources (NSC)

Hi, I am using Non-Sequential mode in OpticStudio, and I am trying to create a square source from a rectangular array. The problem is that the source only traces rays to a single quadrant of the optical system. I would like to create a square source without having to create four separate sources in each quadrant. Thank you in advance! Best regards,Jesús

323

1 day ago

FrantisekSingle Emitter

asked in Got a question?

Collimating beams with lightpath lenses

I would like to ask you to help with one Zemax file.I use one Lightpath aspheric lens to collimate beam in 30 mm distance.In POP there is some Newtons circles as picture of irradianceIn don’t know, why there is no standard Gaussian distribution of beam. It is looks like some interference of sources……Is it possible, that in lens model is EVEN ASPHERE used ?Or there is some bad settings somewhere ?POP picture, setting and lens data of the lens are in files.Thanks for any answerBest RegardsFrantisek

471

2 days ago

Sasha.BrodskyMonochrome

asked in Got a question?

Spot efficiency for laser and focusing objective blackbox

I designed a custom objective for a laser system, and I want to compare the efficiency (including aperture clipping), and peak intensity with a catalogue objective, whose Blackbox I have.I found that Huygens PSF gives spot quality without considering efficiency, and the geometrical analysis method GIA shows efficiency but not the realistic spot size and peak intensity.Is there a standard practice for comparisons like these?Thanks in advance.

571

2 days ago

rayTracerSingle Emitter

asked in Got a question?

What is the equivalent non sequential object type for sequential extended toroidal grating surface

Hello Zemax Community,I've modeled a freeform lens in sequential mode using the Extended Toroidal Grating Surface Type in Zemax. I defined my lens with parameters for Radius, Conic Constant, and Extended Polynomial Terms. Since the lens is an astigmatic component, it has curvature along the Y-axis while remaining flat along the X-axis, which is why I selected the extended toroidal grating surface.When I converted the sequential model to a non-sequential model using Zemax’s “Convert to NSC Group” feature, the lens appeared as a combination of Standard Surface, Grid Sag Surface, and Compound Lens. However, the performance doesn’t match my original sequential model, and I suspect the conversion process may not have fully captured the lens design.My question is:Is there an object type in NSC mode that allows me to manually enter my Radius, Conic Constant, and Extended Polynomial Terms to recreate the lens accurately? Are there recommended steps for converting this type of lens from Sequent

170

6 days ago

Tiago117Infrared

asked in Got a question?

Fidelity of aspherical lens export to .dxf

I read this article (How accurate is the CAD exchange? – Knowledgebase) and I am wondering how it applies to the 3D .dxf export.I intend to use this exported polygon in a silicon fabrication process called greyscale lithography. And now I am wondering how realistic this polygon is. I have an aspherical lens with its 4th, 6th and 8th order coefficients optimized.I'm not expecting a perfect translation as the greyscale process itself isn't perfect (and transforms this continuous shape in steps). But using as many segments the software allows (128), would you say this export is aspherical "enough"? As in, while it may not be as perfect as the modelling Zemax uses, it is still, nonetheless, an aspherical surface, similar to the one I optimized?My exported aspherical lens with 128 segments.Thank you!

150

7 days ago

chumphreysMonochrome

asked in Got a question?

Modeling a conical spatial filter in non-sequential

I am looking to model a conical spatial filter and I am trying to figure out the best way to do this. I started with a non-sequential model and an absorbing annular volume as the spatial filter. I am specifically trying to look at the spatial frequencies being clipped by the spatial filter, the output beam profile, and how the roughness of the surface of the spatial filter can impact the output beam. I am using the detector viewers to look at the output beam but is there a way to quantify these results. Any assistance would be greatly appreciated.

502

7 days ago

pepeMonochrome

asked in Got a question?

Spot size inconsistencies between the designs with the same lens

Hello,I created an optical system using Thorlabs collimator RC08FC-P01 (90 degree reflective mirror) and AL2550M lens. The Zemax files were obtained from Thorlabs site and modified to fit my needs.If I only use a lens as designed by Zemax engineers, the spot size for 405 nm is 0,15 microns, but if I use a collimator and then put the lens in the beam path, the spot size for the same wavelength is much larger at 55 microns.Is this due to design of collimator, software artefact or something else? I attached .zmx files of the lens and collimator+lens designs.

673

8 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.

230

9 days ago

LeonMonochrome

asked in Got a question?

I am confused about scattering power

Assume 5 extreme cases:1 If a surface is transparent with Scatter Fraction 1 , how much power is scattered? 2 If a surface has 0.5 reflectance with Scatter Fraction 1 , how much power is scattered and spcular reflected?3 If a surface has 0.5 reflectance with Scatter Fraction 0.5, how much power is scattered and specular reflected?4 If a surface has 1 reflectance with Scatter Fraction 1 , how much power is scattered and specular reflected?5 If a surface has 1 reflectance with Scatter Fraction 0.5, how much power is scattered and specular reflected?

612

10 days ago

Renaud.LigotInfrared

posted in Got a question?

ISO drawing edge thickness

Hi In addition to my previous post (“units in the new ISO element drawing”) I would like to point out that the edge thickness annotation that has been added to the ISO drawing in the last update Zemax OS is not always correctly calculated! See example below where the edge thickness is clearly not the sum of the central thickness and the sag of the surfaces (by the way, the SAG are also not correct) . Moreover the number of decimals is a bit exaggerated in my opinion.I think having edge thickness and total thickness of the lens indicated is a real plus (if correctly calculated 😏) but then it would be interesting to be able adding the tolerance on those values.

431

13 days ago

光

光儒.王Single Emitter

asked in Got a question?

Why MCSD affect the thermal analysis result?

When i make Thermal to analysis the optical performance (MTF..), the value of MCSD will affect the results.When i set the MCSD>SDIA, the thickness value of air gap will be different.Do you know how the MCSD affect the calculation of air gap thickness?

271

14 days ago

TdsorensSingle Emitter

asked in Got a question?

Tracing an EXPLICIT ray in Sequential Mode

Is there a way to trace an Explicit ray (defined by x, y, z, l, m, n) instead of an Implicit Ray (defined by Hx, Hy, Px, and Py) in the Single Ray Trace Analysis or Merit Function?I am trying to trace a ray from Surface 1 with (0,0,0) coordinates and direction cosines (0,0,1) through a system with tilted and decentered mirrors making it such that the ray will not pass through the center of the pupil therefore making the implicit method ineffective.

512

14 days ago

SPJensenSingle Emitter

asked in Got a question?

Phase Errors Reconstructing .ZBF Text File

I used Matlab to write a .ZBF text file for POP. When Zemax reads the file in the irradiance is perfectly replicated but the phase is not; when non-zero the phase looks like random noise. This is very strange because you need to write the .ZBF file using Re and Im values for the field. Unless the Re and Im values are both correct in the file you can’t get the correct irradiance values. I have done this before and it worked so I had a friend with an older version of Zemax installed (22.1.2) check the same file. His version of Zemax correctly replicated the phase. I am using version 2023 R1.03 on a windows machine. Any ideas as to why this is happening? Did the .ZBF format change? Is there now a setting I need to adjust in Zemax when I import a file? Is this a known problem that has been fixed in an update? Matlab intensity:Zemax IntensityMatlab PhaseMy Zemax Phase:Old Zemax Phase:

281

14 days ago

pepeMonochrome

asked in Got a question?

TIR (total internal reflection) error during the lens optimization popping up

Hello, I use OpticStudio 15.5 SP3 and I have an issue with optimizing the design consisting of “of the shelf” components by Thorlabs, reflective collimator, and objective lens. I want to obtain the image in focus, but I get the error stating: Error in target 5. TIR at surface 7!Possible reason for this behaviour is negative thicknesses: 1. in collimator in order to get the rays reflecting of the mirror, and 2. in lens in order to make the rays go through the lens. If I change the thickness following the reflective collimator to positive (-100 to 100) then the rays reflect inwards. If I change the thicknesses of lens and air after lens from negative to positive, the rays are reflected from back surface of the lens. How do I run optimization without error?

432

14 days ago

Dr. Neha.KhatriVisible

asked in Got a question?

Clarification on Using Zernike Coefficients in Zemax

I have a set of 37 Zernike coefficients that I need to input into Zemax for my project. However, I'm unsure about the correct procedure for reflective surfaces (mirror). Should I divide each coefficient by 2 and then multiply by the wavelength?Additionally, I have chosen to use the Zernike standard sag for this application. Is this the right approach? I also noticed that the peak-to-valley (PV) value in my wavefront map differs from the measurement obtained from Zygo.

1433

14 days ago

harshanaStudent

asked in Got a question?

Diffractive surface ray direction calculation

I looked at the following article.How diffractive surfaces are modeled in OpticStudio – Knowledgebase (zemax.com)I am confused about how the direction is calculated after determining the phase profile. The article says the cosine of the derivative of the phase difference is added. But that difference is not between -1 and 1 in most cases. For example, if wavelength=400, p=1, p^2 coeff = 1, the change of direction is 400/(2pi) > 1. Can someone explain where I am going wrong here?

6846

16 days ago

Jonathan.EverettSingle Emitter

asked in Got a question?

Importing Zernike Fringe Sag data from MetroPro and correct normalization radius

I have measured the surface deviations of a 16mm diameter lens with a Zygo running on MetroPro and have exported a 37 term Zernike Fringe Sag data table. When I enter the Zernike Fringe Sag coefficients directly into OpticStudio the magnitude of the resulting transmitted wavefront error is appropriate to the expectation based on the surface error but the Normalization Radius was left defaulted to 100 in OpticStudio and was not set to match any corresponding radius value in MetroPro. If the Norm. Radius is changed the resulting wavefront changes but not in any way that makes sense with regards to the Zygo measurements or expectation. Is there a method to set the Normalization Radius in OpticStudio such that Zernike Fringe Sag data imported from MetroPro can be correctly used to model an as-built lens? Could the MetroPro output also assume a Normalization Radius of 100?

6924

16 days ago

Amy EntinInfrared

asked in Got a question?

STP Export with Object Names?

Hi, I’m exporting an NSC file as a STP, and it creates the bodies and labels them by object number. Does anyone know of a way to automatically set the comment of the object as the object label in the STP file?

353

17 days ago

AliRSingle Emitter

posted in Got a question?

Zemax operand values are different from the plot

Dear all, I have a question regarding a ZEMAX model of a segmented telescope, which I’ve set up using non-sequential components.The issue arises with the DENC and GENC operands, which return incorrect values when I introduce disturbances to the segments. Specifically, the encircled energy value I observe in the plot differs from what GENC and DENC report after I apply any clocking or decentering adjustments to a segment. However, in the nominal model—where no disturbances are applied to the segments—the GENC and DENC values are accurate.

450

17 days ago

Renaud.LigotInfrared

asked in Got a question?

units in the new ISO element drawing

HiIt looks like units of the surface figure 3/A(B/C) have changed from fringes to fringes (for A) and nm (for B).Is there a good reason for that?Can we change it and come back to the previous default fringe unit?(B is defined by the operand TIRR in my tolerance data editor)Thank you

280

17 days ago

Itay.BretnerSingle Emitter

asked in Got a question?

Beam center vs element tilt plot

I trying to create a plot of an element tilt vs beam center location.What would be the simplest way to create such a plot?

564

17 days ago

Sean TurnerUltraviolet

posted in Got a question?

Zemax.com will be moving to Ansys.com

What does this announcement on the front page of www.zemax.com mean for this community forum and knowledgebase?I hope the forum will stay open, but in the case it gets shut down, will there be an equivalent forum on the Ansys website? Will legacy Zemax users have access without a license for an Ansys product?

62720

19 days ago

bgdi10262Infrared

asked in Got a question?

The same .zmx file results different POP results on different computers

Hi All,I would like to ask two separate questions here:I ran the same POP.zmx file on two computers that have the same version of Zemax version, 2023.R2.02. System settings and POP settings are all the same. One gives fiber coupling efficiency 72% and the other one gives 80%. What could be the reasons behind this discrepancy? I ran that POP.zmx file on one computer that has Zemax version 2024.R2.02. It’s a simple optical system using two lenses collimating and coupling laser coming out from one fiber into the other one. I have a dummy surface before the first lens to check the beam. In the Physical Optics option under Surface properties, if I turned off “Auto Resample”, it gives coupling efficiency of 93% and a 10E+04 times higher total power (while the input is 1.0). However, if I turned on “Auto Resample”, it gives coupling efficiency of 77% and a 0.99 total power (more reasonable). My questions is: why sampling affects the fiber coupling efficiency calculation and which value is mor

643

20 days ago

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