Fig.3 Energy distribution in axicon image 
  
  
of = 
-05 | PERI entral bright spot 
101 
Any AAA: 
ATT 
Fig.4 Wavefront aberration of centrax lens 
w(h) (um) 
A 
          
     
------2----- Infinity (field | edge)--—------------- 
eor 
—————- Infinity. (field | centre)-----7-7777—]--^7 
       
zZ NV 500 mm (field | edge] - - -7—7-7-777-—7— 
RNC 500 mm(field | centre)-----7- 7--- 7