2 Threshold Gain
Essentially every model that will be developed in this text starts with the threshold gain equation—no equation is more important in laser work and it is essential to all models that will be developed that this equation be formulated such that it accurately reflects the quality of optical elements in the laser. While the equation is, at first glance, simple enough to formulate, there are many subtleties that need to be addressed in the course of developing an accurate equation.
It is such an important concept that the majority of this chapter is dedicated to developing the equation with examples given for a number of basic laser configurations. Once developed, examples of usage of this equation in determining rudimentary laser ...
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