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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.
The definition of the radius of a laser beam with a flat-top profile is trivial, but most light beams have other transverse shapes. A frequently obtained shape is the Gaussian one, where the transverse intensity variation is described with the following equation: I (r, z) = P π w (z) 2 / 2 exp. .
Laser specifications describe properties of a laser system, including performance parameters, dimensions, and operating conditions.
9: Beam Profile. A laser’s beam profile describes the distribution intensity at a cross-section of the beam. Common beam profiles include Gaussian and flat top beams, whose beam profiles follow Gaussian and flat top functions, respectively (Figure 4). However, no laser can produce a perfectly Gaussian or perfectly flat top beam whose beam ...
Table 7.1. Relevant beam parameters of excimer lasers and evaluation procedures according to ISO standards. HNF(x,y) and HFF(x,y) denote the near-field and far-field energy density distributions, respectively. the employed optics and sensors under pulsed UV irradiation.
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.
Class 1 lasers are very low risk and "safe under reasonably foreseeable use", including the use of optical instruments for intrabeam viewing. Class 1M lasers have wavelengths between 302.5 nm and 4000 nm, and are safe except when used with optical aids (e.g. binoculars).
