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Optical Windows
How to input the data measured by interferometer into OpticStudio
Jul 06, 2018
In this case we use ZYGO interferometer provide data as example, ZYGO interferometer generated data file format for company. ZXGRD file, we need in OpticStudio converts the file format. DAT file.
We use ZYGO interferometer provide data as example, ZYGO interferometer generated data file format for company. ZXGRD file, we need in OpticStudio converts the file format. DAT file, and to save the file in Zemax root directory "DocumentZemax/ObjectsGrid Files".
The screenshot at the beginning of the data file shows that the data format is the same as the Grid Sag data format mentioned in last week's article.The number of data points in XY direction is 732, and since the distance between data points is 0.01344, the diameter of the data file is 9.72mm.Where the first line of the file has a terminal flag (flag) of 0, representing the data unit of mm.

It should be noted that if the measured data is stored as wavefront data, we need to treat this data file as phase data.The Grid Sag of OpticStudio is in radians.Therefore, the measurement data need to be converted, and the conversion formula is as follows:
Zemax unit (radian) = ZYGO measurement unit (mm) x 2
In the data file provided by this example, the measured wavelength is 632.8nm, then:
Zemax unit (radians) = ZYGO measurement unit (mm) x 2 PI / 0.0006328 = 9924 x (ZYGO measurement unit)

In aperture lens editor (STO) phase surface type set to a grid, and properties on the surface - the import TAB in the previously saved data file to import, in this case for the test. The DAT file, as shown in the figure below.
Meanwhile, the Diffraction order of Grid Phase is input with the unit conversion value calculated above:
Click ok to see the following interferogram results, which are consistent with the data on the interferometer.

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