Polarized Beam Splitter Cube

• Product Description
• Design wavelengths: 405 nm, 532 nm, 633 nm, 780 nm, 808 nm, 830 nm, 850 nm, 1030 nm, 1064 nm and 1550 nm
• Extinction ratio (Tp:Ts): >3000:1
• Application: Separating P light and S light

The Bote polarization beam splitting cube is composed of two UV fused silica right-angle prisms. The dielectric beam splitting film can reflect S-polarized light and transmit P-polarized light.

All sides of the cube can be used as incident surfaces and separate P-polarized light and S-polarized light.

In order to achieve the best polarization performance, it is recommended that the incident light enters from the right-angled edge of a prism coated with a polarizing beam splitter film (a prism with a black dot on the top indicates its The bevel is coated with dielectric polarizing light splitting film).

The extinction ratio of the polarization beam splitting cube is Tp:Ts > 3000:1, and the four light-passing surfaces are coated with V-shaped anti-reflection coatings designed for a single wavelength. The reflectivity of the anti-reflection coatings is less than 0.25%@design wavelength.

Bote provides 10 design wavelength options of 405 nm, 532 nm, 633 nm, 780 nm, 808 nm, 830 nm, 850 nm, 1030 nm, 1064 nm and 1550 nm.

Special customization services for other design wavelengths and sizes can be provided. If necessary, please contact technical support.

Specification

Technical Description

Bote’s polarization beam splitting cube is coated with dielectric light splitting film on the inclined surface of the prism marked with dots to achieve P light transmission and S light reflection.

When the polarizing beam splitting cube is used, there will be no beam deviation, the optical path of the reflected light and the transmitted light are equal, and it can also be used to shorten the optical path of the system. Compared with flat plate polarizing beam splitters, ghosting can be significantly reduced.

The function of polarization beam splitting cube to achieve polarization splitting is based on Brewster’s law. When natural light is incident at Brewster’s angle, all reflected light is linearly polarized light. At this time, the P light is completely transmitted, while the S light is partially reflected and partially transmitted.

Due to the refractive index of the beam splitting cube material, usually only the film layer meets the Brewster angle requirements. At this time, the P component of reflected light will be generated between the prism and the film layer.

In order to improve the S light reflectivity and eliminate the P light component, the interference constructive and destructive methods are used. The phase of the S light reflected by different reflective surfaces is the same, and the phase difference of the P light reflected by different reflective surfaces is an odd multiple of π.

The extinction ratio is an important parameter of the polarization beam splitter cube. It is defined as the ratio of the maximum optical power and the minimum optical power of the transmitted light passing through the analyzer after the incident light is split by the beam splitter cube, that is,

Extinction Ratio=Pmax/Pmin

The extinction ratio can be measured by the following method: the light beam is divided into a polarized cubic beam to generate reflected light and transmitted light.

After the transmitted light passes through the analyzer, an optical power meter is used to measure the power of the transmitted light. Rotate the analyzer and get Pmax when the power count value is the largest , and Pmin when the value is the smallest..