Transient Laser Behavior



In this chapter, we will consider a few cases where the pump rate and/or cavity losses are time dependent. We will also consider situations in which a nonlinear optical element, such as a saturable absorber, is inserted in the laser cavity, where the non-linearity leads to the laser departing from stable cw operation. For these various cases we are thus dealing with transient laser behavior. The transient cases to be considered can be separated into two categories: (i) Cases, such as relaxation oscillations, Q-switching, gain switching and cavity dumping, where, ideally, a single mode laser is involved and which can be described by a rate equation treatment. (ii) Cases where many modes are involved, e.g. mode-locking, and for which a different treatment needs to be considered. This requires a description in terms of either the fields of all oscillating modes (frequency domain description) or in terms of a self-consistent circulating pulse within the cavity (time domain description).


Photon Number Laser Cavity Saturable Absorber Gain Medium Population Inversion 
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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Dipto. FisicaPolitecnico di MilanoMilanoItaly

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