How to set up the coating

  • 29 January 2021
  • 1 reply
  • 1049 views
S

Hi Zemax users


I want to set up the coating.


I know the refractive index, thickness, reflectivity, and wavelength of the coating material.


I wrote the following in the coating file.


But I couldn't record the reflectance when using the COAT command.


And, when using the IDEAL command, the thickness could not be set.


How do I set up a coating material with 0.1mm thickness, 98% reflectivity, and 1.64 refractive index


----------------------------------


MATE BASO1

0.42 1.64 0


COAT BASO4

BASO1 .1


! IDEAL BaSO4 0.00 0.93


-----------------------------------


 



















NAME Thickness refractive index reflectivity WAVELENGTH
BASO4 0.1 1.64 98% 0.42

 


Suhwan Kim

1 reply

Alissa Wilczynski
Rank
Userlevel 4
Badge +3

Hi Suhwan,


I think you actually have more information than expected - not a bad thing. You should be able to model your coating using either method (COAT or IDEAL) but the key is to make sure that you have 'Use Polarization' enabled in each analysis and/or raytrace so that your results account for the coating.


It would be better to model the system using your actual coating material and thickness if you were going to use multiple wavelengths or other factors that change the optical performance of your coating. If you are truly only using one wavelength in your system and you know that the reflectivity is 98%, then you can get away with that IDEAL coating.


One more thing - I think your IDEAL definition should be:


IDEAL BASO4 0.00 0.98


This would indicate 0% transmission and 98% reflection, 2% absorbance.

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