reflection. Radiant backscatter from a surface
illuminated incident beam of light which is dispersed over a multiplicity of
angles resulting in change in the spatial distribution of the beam.
radiation. The transverse propagation of energy
consisting of orthogonally alternating electric and magnetic fields which
travel through space at the velocity of light.
lasers. Military lasers exempted under 76EL-01 DOD
from 21 CFR 1040 where compliance would hinder mission fulfillment during
actual combat or combat training operations or when the laser product is
classified in the interest of national security.
(ft cd). A British unit of illuminance of a
surface 1 square foot in area from a source of uniformly distributed flux of 1
lumen. One lumen per square foot is a footcandle. This is an obsolete term;
see lux and luminance of a source.
access. Access at a particular point to: laser or
collateral radiation by any part of the human body, or laser radiation by a
straight unobstructed path of up to 100 centimeters from any part of the human
radiation (IR). Electromagnetic radiation with
wavelengths which lie within
the range of 0.7 Ám to 1000
Ám. This region is often broken into three spectral bands by wavelength:
IR-A (0.7 Ám to 1.4 Ám). IR-B (1.4 Ám - 3.0 Ám), and IR-C (3 Ám to 1000
Ám). IR-A is sometimes called near-infrared.
(E). The ratio of the radiant power incident upon
a surface to the unit area of the surface for some element of the surface; its
unit is watt per square centimeter (W/cm2).
(J). A unit of energy used normally in describing
a single pulsed output of a laser, it is equal to 1 watt-second or 0.239
surface. An ideal diffuse surface whose emitted or
reflected radiance (or brightness) is independent of the viewing angle.
Laser. Any device which can produce or amplify
optical radiation primarily by the process of controlled stimulated emission.
A laser may emit electromagnetic radiation from the ultraviolet portion of the
spectrum through the infrared portion. Also, an acronym for: Light
Amplification by Stimulated Emission of Radiation.