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Beam Displacers

Product Description: 

A Beam Displacer splits an unpolarized light beam into two orthogonally polarized beams which are parallel to each other. The most widely used materials for beam displacers are Yttrium Vanadate (YVO4) crystal, Barium Borate (α-BBO) crystal, Calcite crystal and Rutile crystal. Among the four materials, YVO4 crystal is the most popular material due to the thermal and mechanical properties, and large birefringence.

You may refer to this page (http://www.pmoptics.com/crystals.html) for material properties.

 

Specifications :  

  Optical Axis Orientation
± 0.5°
  Parallelism
 <15 arc seconds
  Perpendicularity
<10 arc minutes
  Flatness
 λ/4 @ 632.8nm
  Surface Quality
  20~10
  Wavefront Distortion
  λ/4 @ 632.8nm
  AR Coating
  Specified by customer

 

900~1200nm 2.6X2.6X10(L)mm YVO4 beam displacer in stock, PCBD-1060102111 ($98.0): 

 
 

 
Broadband AR coating on both sides (<0.3%): 900~1200nm, surface quality: 20~10. beam separation: 1mm, high extinction ratio: >100,000:1. Contact us for quantity pricing.

 

810nm 2.6X2.6X10(L)mm YVO4 beam displacer in stock, PCBD-0810102101 ($98.0): 

 
 

 
810nm AR coating on both sides (<0.3%): surface quality: 20~10. beam separation: 1mm, high extinction ratio: >100,000:1. Contact us for quantity pricing.

 

960~1160nm 2.6X3.6X14.2(L)mm YVO4 beam displacer in stock, PCBD-1060105121 ($115.0): 

 
 

 
Broadband AR coating on both sides (<0.3%): 960~1160nm, surface quality: 20~10. beam separation: 1.4mm, high extinction ratio: >100,000:1. Contact us for quantity pricing.

 

Beam Separation Calculation: 

Figure 2 shows a schematic drawing for the beam separation calculation. Optical axis is in the plane ABFE. When an incident beam is perpendicular to the surface ABCD, then the beam separation between o-ray and e-ray is given by:

 

 (1)
 

 (2)
 

 
  Figure 2: A drawing for beam separation calculation  

where

                               L: Crystal length
                               d: Beam separation between two rays
                               α: Angle between two rays inside the crystal
                               θ: Angle between optical axis and wavevector
                              

Figure 3 shows the beam separation verse angle θ and the beam separation verse wavelength for a 10mm long crystal. At a fixed wavelength, the beam separation reaches maximum when the angle θ is around 45 degrees. At a short wavelength, the separation is larger due to a large birefringence.

Figure 3: Beam separation verse angle and beam separation verse wavelength

One adverse effect for many applications is the beam separation at both horizontal and vertical directions when an indent light beam is not perpendicular to the line BC.

Mount Dimensions: 

The mount out diameter is 5.5mm and the length is the crystal length plus 0.5mm for standard size crystals. Custom dimensions and shape are available upon request.

Figure 4: Beam displacer mount dimensions

Ordering Information:

    P      B    D 
       
  X 
   
 
 
     
           

A

 

B

 

C

 

D

 

E

 

F

   
     

A

 Wavelength

 1550 = 1550nm
 
 0980 = 980nm
 
 XXXX = Your Application Wavelength
 
 

B

Material

 1 = YVO4
 
   2 = Calcite
 
   3 = Alpha-BBO
 
   4 = Rutile
 
   0 = Special
 
 

C

Dimensions

 01 = 7(L)X2.6(W)X2.6(H)mm  
  Check Standard Size Table Below
 
   00 = Custom Dimensions
 
 

D

Optical Axis Angle (θ*)

1 = 45°
 
   0 = Special
 
 

E

Polishing Angle   (Φ)

1 = 0°
 
  2 = 5.8°
 
   0 = Special
 
 

F

AR Coating

 1 = Yes
 
   0 = No
 

                     *: See the drawing below


Standard Size Table:  

  Dimensions P/N
Length (L:mm)
Width (W:mm) Height (H:mm)
  01
7.0
 2.6  2.6
   02
 10.0
 2.6 2.6
  03
12.0
 2.6  2.6
  04
15.0
 2.6  2.6
  05
14.2
 2.6  3.6

 

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