Thresholdless Lasers

Lasers with a threshold power which is virtually zero.

A thresholdless Laser is a laser where the Threshold Pump Power is essentially zero. An essential point is that the spontaneous emission is forced to occur primarily into the spatial Mode defined by the laser resonator. This is possible with a microcavity around the (microscopically small) Gain medium, which modifies the mode structure of the environment of the gain medium. Even IF there are several suitable modes, emission into the laser mode can be dominating if that mode has the highest Q factor.

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