We propose an alternative method to Q switching for generating giant pulses of laser light in three-level media. This mehod is based on the presence of an external coherent field driving one transition to allow the accumulation of a large population inversion in the other transition without laser oscillation even in a cavity with high-
Q factor. The switching off of the external coherent field causes the development of the giant pulse. Different time profiles for the switching off of the external field have been investigated.
Amplified ultrashort laser pulses are useful in many fields of science and engineering. We propose a quantum approach to ultrashort pulse generation using transient quantum coherence that predicts order of magnitude stronger pulses generated with lower input energy than in the steady-state regime. This femtosecond quantum-coherent analog of nanosecond
Q switching is not limited by the pulse duration constraints of the latter and, in principle, may be used for a variety of lasers including plasmon nanolasers. This approach, applied to the generation of giant plasmon pulses, could achieve quantum control of plasmon relaxation dynamics by varying the drive-pulse delay, amplitude, and duration. This holds promise for a new control mechanism. We discuss implementations and applications of this source of ultrashort nano-optical studies.