Patent ID: 11947104
Assignee: KOREA BASIC SCIENCE INSTITUTE
Field: Optics (Instruments)
Classification: CPC G  H | IPC G

Claim 10:
11. The apparatus of claim 10, wherein, at a point of a radial angle φ on the spiral phase plate, a relative height H to the point with the lowest step is determined through Equation below,, H
     =
     
      
       
        n
        ⁢
        λ
       
       
        4
        ⁢
        πcos
        ⁢
        θ
       
      
      ·
      
       
        tan
        
         -
         1
        
       
       [
       
        
         tan
         ⁢
         φ
        
        
         sec
         ⁢
         θ
        
       
       ]
      
     
    
   
   
    
     (
     Equation
     )
    
   
  
 

(H: a step height at a specific phase angle, n: a phase quantum number, λ: a wavelength of an incident beam, θ: an incidence angle of an incident beam with respect to a spiral phase plate, φ: a phase angle).