Solved

Wavefront map units

  • 25 January 2023
  • 3 replies
  • 580 views

Hello,

I wanted to get the wavefront map of a cerain zernike coefficient representing an aberration. Is there a way to change the unit ‘WAVES’ into ‘mm’ or ‘nm’?

 

icon

Best answer by Sandrine Auriol 26 January 2023, 16:59

View original

3 replies

Userlevel 6
Badge +2

The wavefront map is always given in waves.

Could you help me with this unit ‘Waves’ then as I don’t fully understand it? To be able to convert it to ‘mm’ for example, can I multiply it by the waelength of the source?

Userlevel 6
Badge +2

Hi @Baraka 

The wavefront map shows optical path differences between rays of a field and the chief ray of that same field at a given wavelength.

The path is measured with a unit of length, like mm and then converts to waves.

If your wavelength is for example 0.55um, then the conversion will be:

wave = 0.55um = 0.00055 mm

OPD in wave = OPD in mm / (0.00055 mm)

Reply