Hi DDDD,

I’m not exactly sure without seeing your system in more details, but typically, the secondary mirror obscure the central portion of the incoming ray pencil. Thus creating a “hole” in the wavefront.

Perhaps this picture from Vladimir Sacek (found on his website) can help:

Ignore the text, just look at the beam path in yellow. Do you notice the missing cone after the secondary mirror? This is why the wavefront can’t be calculated.

I hope this helps.

Take care,

David

Hi DDDD,

 

I’m not exactly sure without seeing your system in more details, but typically, the secondary mirror obscure the central portion of the incoming ray pencil. Thus creating a “hole” in the wavefront.

Perhaps this picture from Vladimir Sacek (found on his website) can help:

Ignore the text, just look at the beam path in yellow. Do you notice the missing cone after the secondary mirror? This is why the wavefront can’t be calculated.

I hope this helps.

Take care,

 

David

Hi David :

  Thanks for your help !

Hi DDDD,

 

I’m not exactly sure without seeing your system in more details, but typically, the secondary mirror obscure the central portion of the incoming ray pencil. Thus creating a “hole” in the wavefront.

Perhaps this picture from Vladimir Sacek (found on his website) can help:

Ignore the text, just look at the beam path in yellow. Do you notice the missing cone after the secondary mirror? This is why the wavefront can’t be calculated.

I hope this helps.

Take care,

 

David

Hi David :

  I have some further questions , hoping that you may help.

  I now need two telescope to intefere  ,I expect the result to have no hole in the center.

  I think after the process of focusing , the result should be a point, the wavefront should have no “hole”. But the result seems to have a “hole” in the center.

Sincerely

DDDD

This is the file I used.

Hi DDDD,

You need to give us more details about what you are trying to achieve. I downloaded your file, but there’s only one telescope in it, as far as I can tell.

Let me know if I’m overlooking something.

Take care,

David

Hi DDDD,

 

You need to give us more details about what you are trying to achieve. I downloaded your file, but there’s only one telescope in it, as far as I can tell.

Let me know if I’m overlooking something.

Take care,

 

David

 

Hi David :

   The  result after intefering should have no “hole”. I used the inteference formula to get the inteference result of two identical focused wavefronts but it has “hole” so I am confused.(So I just used one zmx file as shown above.)

Sincerely

DDDD