The Principles of Several Types of Beam Splitter Prism

Beam Splitter Prism

Cube beam splitter prism consists of a coating applied to the hypotenuse of a right-angle prism, which is then bonded to another identical right-angle prism to form a cube-shaped beam splitter prism. This design avoids the astigmatism associated with flat dichroic mirrors, and because the coating is not directly exposed, it is less susceptible to damage and corrosion. Compared to flat dichroic mirrors, a beam splitter prism offers equal optical paths for both reflected and transmitted light. When transmitting light, the beam splitter prism does not cause light displacement, thereby avoiding beam shift, ghost images, and interference issues. It is used for light splitting and imaging. There is no need for long-term calibration when incident at a 45° angle.

Polarizing Beam Splitter Prism

Polarizing beam splitter prism, when the incident angle meets the Brewster's angle condition, the reflectance of polarized light P becomes0. By controlling the film layer, the reflectance of polarized light s approaches 1, and the transmittance of polarized light p approaches 1. Since it is difficult to achieve the Brewster's angle condition when the film layer is exposed to air due to the relatively lower refractive index of air, the film layer must be enclosed within bonded prisms. Compared to beam splitters, the beam splitter prism offers equal optical paths for both reflected and transmitted light. When transmitting light, the beam splitter prism does not cause light displacement, thereby avoiding beam shift, ghost images, and interference issues. It is used for light splitting and imaging. There is no need for long-term calibration when incident at a 45° angle. The P component of the incident light transmits completely, while the S component is reflected at a 90° angle.

Depolarizing Beam Splitter Prism

Different from energy-based light splitting types, the depolarizing beam splitter prism splits the incident light into transmitted and reflected beams according to a specified splitting ratio without altering the polarization state of the incident light. It is important to note that the depolarizing beam splitter prism uses a metal-induced splitting film which absorbs a certain portion of the incident light (usually<10%), this should be taken into account when dealing with high-power lasers.

Laser Line Polarizing Cube Beam Splitter Prism

Laser line polarizing cube beam splitter prism is designed for the laser wavelengths emitted by gas lasers and solid-state lasers. These laser line polarizing cube beam splitter prism can split randomly polarized incident light into two orthogonal linearly polarized beams. The splitS polarized light is reflected at a 90° angle to the incident light, while the splitP polarized light transmits directly. These laser line polarizing cube beam splitter prisms are made from a pair of right-angle prisms bonded together, providing high extinction ratio, high transmittance, and ensuring good parallelism between the incident and transmitted light. Standard stock sizes include 10mm and 12.7mm components, which are widely used in lasers, laser systems, educational research, and laser processing products and related fields. Custom laser line polarizing cube beam splitter prism can also be made to meet specific requirements.