Object
The subject matter or figure imaged by, or seen through, an optical system.
Opacity
The condition of being non-transparent.
Open installation
Any location in which lasers are used that will be open to operating personnel during laser operation and may or may not specifically restrict entry to observers.
Operation
The performance of the laser or laser system over the full range of its intended functions (normal operation). It does not include maintenance or services as defined in this glossary.
Optic disc
The portion of the optic nerve within the eye that is formed by the meeting of all the retinal nerve fibers at the level of the retina.
Optical cavity
Space between the laser mirrors where lasing action occurs.
Optical density
A logarithmic expression for the attenuation produced by an attenuating medium, such as an eye protection filter.
Optical fiber
A filament of quartz or other optical material capable of transmitting light along its length by multiple internal reflection and emitting it at the end.
Optical pumping
The excitation of the lasing medium by the application of light rather than electrical discharge.
Optical radiation
Ultraviolet, visible, and infrared radiation (0.35 to 1.4 æm) that falls in the region of transmittance of the human eye.
Optical resonator
See resonator.
Optically-pumped lasers
A type of laser that derives energy from another light source, such as a xenon or krypton flashlamp or other laser source.
Output coupler
Partially reflective mirror in a laser cavity that allows emission of laser light.
Output power
The energy per second measured in Watts emitted from the laser in the form of coherent light.
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