PBSW Series Polarizing Beam Splitter Prism

Description

Product Description

• A beam splitter with a widened wavelength range for polarization separation, which can be used in experiments with multi-wavelength lasers or continuous spectrum light sources;
• By transmitting P-polarized light and reflecting S-polarized light, the polarization state of incident light can be orthogonally separated;
• Coated with multi-layer dielectric films, the light loss is very small, and polarization light can be effectively separated;
• Coating: Polarizing beam splitting film is coated on the inclined surface; broadband multi-layer anti-reflection film is coated on the four outer surfaces. As it is a cube-shaped half-mirror, when the beam is incident vertically, the optical axis of the emergent light will not have parallel displacement. Moreover, when the incident beam is the same as the diameter of the effective range, the transmitted light or reflected light will not have vignetting or shrinkage;

A cube-shaped half-mirror that equally splits unpolarized light such as white light sources or LED light sources into transmitted light and reflected light; regardless of the polarization direction of linearly polarized light, the splitting ratio (1:1) of reflected light and transmitted light remains unchanged;

Technical Description

– Beam Splitter Prism Series

Widely used in image science, laser measurement and other fields. A beam splitter is an optical device that can split a beam of light into two beams, and it is an important part in optical interferometers. In its most common form – a cube.

Classification of Beam Splitters:

By component: Beam Splitter Plate, Beam Splitter Prism;

By polarization state: Polarizing Beam Splitter Prism, Non-Polarizing Beam Splitter Prism;

By bandwidth: Narrowband Beam Splitter Prism, Broadband Beam Splitter Prism;

Compared with beam splitter plates, the optical paths of reflected and transmitted light of beam splitter prisms are equal. When transmitting light, the beam splitter prism is not affected by light deviation, so there will be no problems of beam translation, ghosting and interference. It is used for beam splitting and imaging. No long-term calibration is required when incident at 45° angle.

T: Transmittance; R: Reflectance; P-polarization/S-polarization;

Figure 1: Polarizing Beam Splitter Prism;  Figure 2: Non-Polarizing Beam Splitter Prism;

When light is obliquely incident on the glass surface, its reflectance changes with the polarization direction of the incident light. The light wave vibrating in the plane formed by the normal of the glass surface and the incident beam is called P-polarization, and the light wave vibrating in the direction orthogonal to P-polarization is called S-polarization. Polarization states in other directions can be regarded as the result of synthesis of P-polarization and S-polarization in different proportions.

The reflectance of P-polarization and S-polarization is determined by the incident angle and the refractive index of the glass. Since they follow different laws, the reflectance of P-polarization and S-polarization is also different.

– Basic Principle of Optical Coating

Optical thin film technology is generally used to control the reflectance and transmittance of the substrate to the incident beam. Coating is a method of plating a layer of transparent dielectric film or a layer of metal film on the surface of the material by physical or chemical means. The purpose is to change the reflection and transmission characteristics of the material surface to meet different needs. To eliminate the reflection loss on the surface of optical components and improve imaging quality, coating one or more layers of transparent dielectric films is called anti-reflection film or anti-reflection coating. With the development of laser technology, different requirements for the reflectance and transmittance of the film layer have promoted the development of multi-layer high-reflection films and broadband anti-reflection films. For various application needs, polarizing reflective films, color beam splitting films, cold light films and interference filters are manufactured by using high-reflection films.

After the surface of the optical component is coated, light undergoes multiple reflections and transmissions on the film layers to form multi-beam interference. By controlling the refractive index and thickness of the film layer, different intensity distributions can be obtained, which is the basic principle of interference coating.

(1) A cube-shaped half-mirror that equally splits unpolarized light such as white light sources or LED light sources into transmitted light and reflected light; regardless of the polarization direction of linearly polarized light, the splitting ratio (1:1) of reflected light and transmitted light remains unchanged.

(2) The prism is pre-installed in a 30mm cage cube;

Assembly

Application Examples