A laser can be engineered to produce light pulses with an incredibly short duration, on the order of picoseconds (1012 s) or femtoseconds (1015 s), by using the optics technique known as mode-locking. In some instances, such as in contemporary refractive surgery, a laser operating in this manner is referred to as a femtosecond laser. A fixed-phase relationship between the longitudinal modes of the laser's resonant cavity is created using this technique. The production of a sequence of pulses from the laser light is possible when these modes interact constructively. Once this happens, the laser is said to be "phase-locked" or "mode-locked." For further information, please view the presentation.

Nithya N Prabhu

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