Polarization Beamsplitter Cube (PBS)
  • Polarization Beamsplitter Cube (PBS)
  • Polarization Beamsplitter Cube (PBS)
  • Polarization Beamsplitter Cube (PBS)

Polarization Beamsplitter Cube (PBS)


The coatings have been designed to hold both the s- and p-polarization components to the same ratio of reflection-to-transmission over a specific laser wavelength region. This means that they will not change the state of polarization of the incident beam .The low polarization dependence of the metallic-dielectric coating allows the transmission and reflection for S- and P-polarization states to be within 6% of each other. All entrance and exit surfaces are coated with a high efficiency, narrowband, anti-reflection coating. We offer both broadband and single wavelength non-polarizing beamsplitters.

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Polarization beamsplitter cube split randomly polarized beams into twp orthogonal, linearly, polarized components-S-polarized light is reflected at a 90°. Angle while P-polarized light is transmitted. Each beamsplitter consists of a pair of precision high tolerance right angle prism cementedPolarization Beamsplitter (PBS) together wieh a dielectric coating on the hypotenused of one of prism.


Item                          Commercial  High Precision
Material:                         N-BK7; Fused Silica
Dimension X×Y:      1×1mm~25.4×25.4mm
Dimension   tolerance:          ±0.1mm±0.03mm
Parallelism:                   <20 seconds<5 seconds
Clear   Aperture:             85%
Surface Quality:     MIL60-40MIL20-10
Flatness(per 25.4mm):      λ/4@ 632.8nm   λ/10@   632.8nm
T/R(for random porlarization)T=(Ts+Tp)/2;R=(Rs+Rp)/2:50/50±5% 50/50±2%
Bevel(face width×45°) :      Protective bevel or specified by customer
Coating:Range of the wavelength specified by customer



Standard Coating wavelength:

Narrow Band: ---------488, 532, 632.8, 650, 808, 850, 980, 1064, 1310, 1550 nm
Broadband: ------------450-650, 650-850, 900-1200, 1200-1550, 1500-1610 nm

Narrow Band:
Material: BK7
Wavelenght: 488, 532, 632.8, 650, 808, 850, 980, 1064, 1310, 1550 nm 


Part No.Norrow BandBroadbandSize
BRD-PBS-3.2355nm, 488nm,   532nm,
    850nm, 880nm, 980nm,
    1064nm, 1310nm, 1550nm
3.2mm x3.2mm x3.2mm
BRD-PBS-55mm x 5mm x 5mm
BRD-PBS-1010mm x 10mm x 10mm
BRD-PBS-12.712.7mm x 12.7mm x 12.7mm 
BRD-PBS-1515mm x 15mm x 15mm 
BRD-PBS-2020mm x 20mm x 20mm 
BRD-PBS-25.425.4mm x 25.4mm x 25.4mm 

When the interference film is used for oblique incidence, a strong polarization effect is produced, especially for the interference film layer in the closed glue prism. This effect is due to the requirement that the tangential components of the electric and magnetic fields at each interface of the film layer be continuous. For S-polarized light, the electric field is perpendicular to the incident interface, and the effective refractive index of each layer is equal to the actual refractive index multiplied by the cosine of the respective refraction angle; for P-polarized light, the electric field is parallel to the incident interface, and the effective refractive index of each layer is equal to the actual refractive index. Except for the cosine of the respective refraction angle. Because of this, we have also designed various types of polarization beamsplitters using this polarization effect.

The design principle of the polarizing beam splitter is to find an incident angle. When a pair of parallel rays is incident at this angle, the reflectivity of the substrate and the film to the P-polarized light is the same. This special angle is called the Bouchers. Special angle. Under this condition, the reflectance of the P-polarized light completely disappears, and the multilayer film stack formed by alternately superimposing the two materials will not cause any reflection to the P-polarized light.

For practical film materials, this condition can only be achieved when light is incident on a multilayer film from a high refractive index medium. Therefore, such a multilayer film is usually glued in the middle of a glass prism. Therefore, only the effective refractive indices of P-polarized light are equal, and two different materials can satisfy the Brewster angle condition.

When the effective refractive index: nL / cosq L = nH / cosqH

And in accordance with the law of refraction: nL*sinq L=nH*sinqH= no*sinq o

Namely: no*sinq o=nH*nL/(n2H+ n2L) 1/2

In this way, the design and preparation of the polarization beam splitting prism can be easily realized by specifying the refractive index of the high and low materials, selecting the angle of the glass substrate or specifying the incident angle of the glass substrate.

The following curves are designed with nb2o5 and sio2 at 45 degrees of incidence:

Polarization Beamsplitter (PBS)

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  • Add: No.399 Bo Cai Road, High-Tech Industrial Development Area, Changchun, Jilin, China, Zip code 130012
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