Patent ID: 11971307
Assignee: BEIJING RSLASEROPTO-ELECTRONICS TECHNOLOGY CO. LTD
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The device according to claim 5, wherein the first FP etalon and the second FP etalon satisfy:, k
  =
  
   
    2
    ⁢
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       FSR
       1
      
      -
      
       FSR
       2
      
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
   
    
     ❘
     "\[LeftBracketingBar]"
    
    
     
      FSR
      1
     
     +
     
      FSR
      2
     
    
    
     ❘
     "\[RightBracketingBar]"
    
   
  
 

wherein k<0.2, FSR1 is a free spectral range of the first FP etalon, and FSR2 is a free spectral range of the second FP etalon.