Beam Displacer

Specifications:

 

Material: YVO4
Dimension Tolerance: ± 0.05mm
Optical Axis Orientation: ± 0.5°
Parallelism: < 15 arc sec
Perpendicularity: < 10 arc min
Flatness: λ /4 @ 633nm
Surface Quality: 60-40
AR Coating: R < 25% @ 1550 ± 40nm or other wavelength  
 

 

 

Based on the birefringence performance of YVO4, a Beam Displacer can divide a beam into o-rays and e-rays. When a natural beam transmits through a birefringent crystal, the beam divides into two rays. One ray transmits through the crystal in a strait path, this ray is called the ordinary ray (o-ray). the other ray is transmitted through the crystal, but changes its direction. This ray is called the extraordinary ray (e-ray). The angle between the o-ray and the e-ray is called the walk off angle α. It is given by:
α = tg-1( no2/ne2 * tgθ )-θ
θ is the angle between the light beam and the optical axis

 

 

 

Part No.
Material
Size
d
θ
φ
Coating
BDP6507
YVO4
2.6×2.6×7.0mm
0.70mm
45°
AR/AR @ 1550 ± 40nm
BDP6510
YVO4
2.6×2.6x10mm
1.00mm
45°
AR/AR @ 1550 ± 40nm
BDP6512
YVO4
2.6×2.6x12mm
1.20mm
45°
AR/AR @ 1550 ± 40nm
BDP6515
YVO4
2.6×2.6x15mm
1.50mm
45°
AR/AR @ 1550 ± 40nm

 

(d is the distance between o-ray and e-ray)