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A collimator is an optical device used to narrow or focus a beam of light, particles, or radiation into a parallel or converging configuration.It is widely used in a variety of fields, including optics, radiology, astronomy, and particle physics. The collimator typically consists of a set of optical lenses or mirrors, designed to eliminate angular divergence of a light beam, ensuring that the light or radiation remains parallel as it travels over long distances.

In the context of medical imaging and radiation therapy, collimators are used to shape and direct beams of X-rays or radiation, ensuring they focus precisely on the target area while minimizing exposure to surrounding healthy tissues. In astronomy, collimators help align telescopes and optical instruments to achieve sharp, focused images of distant celestial objects.

A precision collimator ensures the alignment of instruments and components, improving accuracy and reducing errors in measurements. The main advantage of collimators is their ability to provide high accuracy in beam alignment and focus control, which is critical in applications such as laser targeting, optical testing, and imaging systems. Additionally, they offer adjustable settings for fine-tuning beam properties, making them versatile for various technical and scientific applications.