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A mode-locked laser is capable of emitting extremely short pulses on the order of tens of picoseconds down to less than 10 femtoseconds. These pulses will repeat at the round trip time, that is, the time that it takes light to complete one round trip between the mirrors comprising the resonator.
Rotary Level Lasers. Then, the other type is a rotary laser, which emits a level line in a rotary fashion. Rotary lasers typically emit a level line around the entire room in 360 degrees. Rotary Lasers are usually a little larger and are mounted on sturdy surveying tripods.