The amount of radiant energy concentrated on a surface.

An accessory used to monitor laser beam power at the rear reflector, tune the beam for optimum power, or monitor power delivered to the work station.

A controlled change in the power level of a laser beam, either linearly, as up a ramp, across, and down again—or in several discrete steps. Useful for smooth completion of circular welds and for preventing fractures from rapid cooling.

The duration of a laser pulse, typically measured as the time interval between the half-power points on the leading and trailing edges of the pulse.

[box]Typical units:
Microsecond (µs) = 10^-6s
Nanosecond (ns) = 10^-9s
Picosecond (ps) = 10^-12s
Femtosecond (fs) = 10^-15s[/box]

The power of a single, brief emission from a laser programmed for pulsed behavior rather than continuous operation. Pulse energy can be several times greater than CW emission.