In this work, we are reporting a new approach to compute the overlap efficiency
of end pumped solid-state laser systems. Unlike existing methods in which the
overlap integral is computed with a linearize approximation near the threshold,
in this method the inverse of the overlap integral is computed numerically in
the above threshold regime for several values of circulating fields. Now by
fitting a linear curve to this data the overlap efficiency is obtained. The
effect of the beam quality factor is also taken into account. It is demonstrated
that the linearized approximation near the threshold can give rise to 50% error
in overlap efficiency. The method was used to estimate the overlap efficiency in
different types of axially pumped lasers.
© Optical Society of America
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