beam diameter


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beam diameter

[′bēm dī‚am·əd·ər]
(optics)
The distance between points on opposite sides of a light beam at which the power per unit area drops to 1/ e (0.37) times its maximum value.
References in periodicals archive ?
Watkins recognized that creating a light for artwork that could be adjusted for light temperature, brightness and beam diameter was critical.
Pattern resolution is usually larger than the beam diameter due to the expansive interaction volume, but it might also be smaller than the beam diameter if the produced pattern is manipulated by a postprocessing technique such as wet etching of silicon upon low-dose gallium FIB exposure, in which the implanted surface patterns act as an etch mask [16].
The biconcave lens was placed at a distance of 500 mm from the laser and then the distance between the biconcave lens and the rectangular cylinder lens was set to 180 mm, in order to make a beam diameter of 23 mm.
The values of spherical aberration, coma, astigmatism, and field curvature are plotted versus the entrance pupil diameter of the test lens (in millimetres), which corresponds to the beam diameter under examination.
Boone and Crockett's scoring system can reveal if a particular buck is charging forward or stuck in neutral, but the beam diameter right above the burr reveals true health and genetic potential.
The irradiance at the cornea is calculated for a given laser parameters from [I.sub.c] = 4P / [d.sup.2.sub.c][pi], where P is a laser power and [d.sub.c] is a beam diameter on the cornea.
Other key highlights include deep focal tolerance, high quality small beam diameter, air cooling (no chiller) and stable output power.
"The narrow beam diameter is about half a metre at 50 metres.
laser resonator in 2.5, 4 and 6 KW versions, a beam radius control, which optimizes the beam diameter for various material substrates and thickness variations and a sensing board and head design, which helps improve cutting speed for all sheet metals.
It integrates a micro Green Laser Pump with a hand-controlled, nine-lens Linear Optical Collimator, and features one-hand thumb controls to adjust the laser beam diameter and illumination intensity.
The second is to measure the response as a function of beam diameter, which may provide insight into certain scattering and diffraction effects that may help understand the TSI scale differences.
The maximum penetration depth (the electron range) depends upon a lot of factors: electron beam current, accelerating voltage, electron beam diameter, electron beam power, material density, etc.