Lasers are the basic building block of the technologies for the generation of short light pulses. Only two decades after the laser had been invented, the duration of the shortest produced pulse had shrunk down six orders of magnitude, going from the nanosecond regime to the femtosecond regime. “Light amplification by stimulated emission of radiation” is the misleading meaning of the word “laser”. The real instrument is not only an amplifier but also a resonant optical cavity implementing a positive feedback between the emitted light and the amplifying medium. A laser also needs to be fed with energy of some sort.
KeywordsSpontaneous Emission Laser Cavity Round Trip Saturable Absorber Gain Medium
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