An optical instrument consisting of a well-corrected objective Lens with an illuminated slit or reticle at its focal plane. Collimators are used in lens testing to determine focal lengths, and in other metrological applications where a distant object at a known location is required.

Highly reflective and yet extremely low in secondary reflection, these devices are critical for interferometric applications. Fiber collimators are fundamental sub-components and building blocks for optical communications and broadband networks, and are widely used to convert a divergent output Laser beam from a fiber or Waveguide into an expanding beam of parallel light. With collimators, fiber optical components for signal transmission, SWITCHING and management can be furnished.

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