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Laser specifications describe properties of a laser system, including performance parameters, dimensions, and operating conditions.
The beam radius indicates the transverse extension of a light beam, often based on the second moment of the intensity profile.
A laser’s beam diameter characterizes the transverse extension of the beam, or its physical size perpendicular to the direction of propagation. It is often defined at the 1/e 2 width, which is bounded by the points where the beam’s intensity reaches 1/e 2 (≈ 13.5%) of its maximum value.
Specifications of a Laser. Beam Diameter: The beam diameter refers to the diameter of the laser beam measured at the exit face of the laser housing. The beam diameter can be defined in several different ways, and for Gaussian beams it is typically described by the 1/e 2 width.
Laser Beams. Author: the photonics expert Dr. Rüdiger Paschotta. Definition: light beams propagating dominantly in one direction. More general term: light beams. More specific terms: collimated beams, Gaussian beams, diffraction-limited beams, flat-top beams. Categories: general optics, laser devices and laser physics.
This chapter reviews the characterization of a laser device by its beam power, propagation of the beam width (beam propagation ratio), the positional stability of the beam, the wavefront of the beam, and the lifetime of the device.
Laser beam expanders increase the diameter of a collimated input beam to a larger collimated output beam for applications such as laser scanning, interferometry, and remote sensing. Contemporary laser beam expanders are afocal systems developed from well-established optical telescope fundamentals.
