Laser Safety Terms in ANSI- Questions and
Answers| Latest Update
pulse-repetition frequency(PRF) The number of pulses occurring per second, expressed in
hertz. Symbol: F
protective housing An enclosure that surrounds a laser or laser system that prevents access
to laser radiation above the applicable MPE.
Pulse duration the duration of a laser pulse; usually measured as the time interval between
the half-power points on the leading and trailing edges of the pulse
pulsed laser a laser that delivers its energy in the form of a single pulse or a train.
radiance radiant flux or power output per unit solid angle per unit area expressed in units
of watts per steradian per meter squared (W* sr^-1* m^-2).
radiant energy energy emitted, transferred, or received in the form of radiation expressed
in units of joules (J).
radiant exposure surface density of the radiant energy received. The SI unit of radiant
exposure is joules per square meter (J*m^-2) or joules per centimeter squared (J*cm^-2).
, radiant flux power emitted, transferred, or received in the form of radiation expressed in
units of watts(W).
radiant intensity quotient of the radiant flux leaving a source and propagated in an element
of solid angle containing the given direction, by the element of solid angle expressed in units of
watts per steradiam (W*sr^-1).
radiant power Power emitted, transferred or received in the form of radiation.
reflectance The ratio of total reflected power to total incident power.
repetitive pulse laser A laser with multiple pulses of radiant energy occurring in a
sequence.
service The performance of those procedures or adjustments described by the
manufacturer's service instructions which may affect any aspect of the performance of the laser
or laser system.
shall The word "shall" is to be understood as mandatory.
should The word "should" is to be understood as advisory.
specular reflection A mirror-like reflections
Answers| Latest Update
pulse-repetition frequency(PRF) The number of pulses occurring per second, expressed in
hertz. Symbol: F
protective housing An enclosure that surrounds a laser or laser system that prevents access
to laser radiation above the applicable MPE.
Pulse duration the duration of a laser pulse; usually measured as the time interval between
the half-power points on the leading and trailing edges of the pulse
pulsed laser a laser that delivers its energy in the form of a single pulse or a train.
radiance radiant flux or power output per unit solid angle per unit area expressed in units
of watts per steradian per meter squared (W* sr^-1* m^-2).
radiant energy energy emitted, transferred, or received in the form of radiation expressed
in units of joules (J).
radiant exposure surface density of the radiant energy received. The SI unit of radiant
exposure is joules per square meter (J*m^-2) or joules per centimeter squared (J*cm^-2).
, radiant flux power emitted, transferred, or received in the form of radiation expressed in
units of watts(W).
radiant intensity quotient of the radiant flux leaving a source and propagated in an element
of solid angle containing the given direction, by the element of solid angle expressed in units of
watts per steradiam (W*sr^-1).
radiant power Power emitted, transferred or received in the form of radiation.
reflectance The ratio of total reflected power to total incident power.
repetitive pulse laser A laser with multiple pulses of radiant energy occurring in a
sequence.
service The performance of those procedures or adjustments described by the
manufacturer's service instructions which may affect any aspect of the performance of the laser
or laser system.
shall The word "shall" is to be understood as mandatory.
should The word "should" is to be understood as advisory.
specular reflection A mirror-like reflections
