
B-70315EN/02 APPENDIX I.GLOSSARY
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Name Meaning
Maximum output
Maximum radiation power or maximum radiation energy per pulse that a laser product
outputs in all directions where there is a hazard of exposure in view of operational
capacity in every area at any point of time after the production of the laser product
Mode State of a resonant system in which an electromagnetic field has a specific distribution
MPE : Maximum
Permissible Exposure
Maximum laser radiation level that can be radiated onto human bodies without harmful
influence to them in an ordinary environment
Operation
Laser product's action covering all intended functions, not including maintenance or
service.
Optical resonator
Device in which stimulated emission of light is used for a laser and which consists of a pair
of reflecting mirrors facing each other
Parameter Variable that is assigned a given value for a specific purpose and indicates that purpose
Phase
Amount representing a positional relationship between two adjacent highest or lowest
points on a wave
Power density Energy per unit area
Protective housing
Laser product housing or its part designed to protect humans from exposure to a laser
beam exceeding an accessible emission level or strong collateral radiation
Pulse duration The time from the rise half-value point of a pulse to the fall half-value point.
Pulse duty Ratio (%) of a duration in which a pulsating laser output is on, to its entire cycle
Pulse frequency Repetition frequency at which pulsating laser beams are radiated from an oscillator
Pulse laser Laser that outputs energy in the form of a single pulse or a pulse train
Pulse output Laser output radiated in the form of a pulse train
Radian Measurement unit of angle; 1 radian equals 360°/2p
Radiant energy Energy emitted, transmitted, or received (measured in joules, or J)
Safety interlock
Device combined with the protective housing of a laser product to stop its operation
automatically when part of the housing is removed
Sequence A succession of steps carried out in a prescribed order
Stimulated emission
The emission of light by atoms and molecules at a certain energy level, induced by
incident light, at the same frequency, in the same phase, and in the same polarized state,
thereby shifting the atoms and molecules to a lower energy level.
Target Jig used to radiate and position a laser beam
Threshold Physical quantity necessary to generate laser beams