Abstract

The technical requirements for active mode locking, as described in the previous two chapters, are not simply fulfilled. The external source for driving the modulator must be accurately frequency stabilized at the pulse repetition frequency. An alternative for obtaining short pulses, called passive mode locking, does not require these complications. The synchronization of the radiation modulation in the cavity with the pulse oscillation is done by the pulse itself. The mode locking is simply obtained by placing a saturable absorber in the cavity. Passive mode locking for obtaining short pulses turns out to be very practical and easy to perform. In this chapter the physics and performances of passive mode locked systems are described.

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