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Photonics Dictionary

Risley prism

A Risley prism, also known as a Risley prism pair or Risley rotating prism, is an optical device used for controlling the direction of a laser beam or other optical beam by independently rotating two prisms with respect to each other. The prisms are typically wedge-shaped and oriented in such a way that they can be rotated around their optical axes.

Key features and characteristics of Risley prisms include:

Two prism configuration: A Risley prism pair consists of two wedge-shaped prisms that are mounted on a common axis. Each prism can be independently rotated around this axis.

Variable beam steering: By rotating the prisms independently and in opposite directions, the angle of the transmitted beam can be controlled. By adjusting the rotation angles of the prisms, the direction of the transmitted beam can be steered with precision.

Angular resolution: The angular resolution of a Risley prism system depends on the accuracy of the rotation mechanisms and the precision of the angle measurement systems used to control the rotation angles.

Compact design: Risley prisms offer a compact and lightweight design, making them suitable for integration into optical systems where space and weight are constraints.

Applications: Risley prisms are commonly used in various applications where precise beam steering is required, such as laser scanning systems, lidar systems, optical communications, and laser tracking systems. They offer a versatile and efficient means of controlling the direction of optical beams with high accuracy and repeatability.

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