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Laser physics and nonlinear optics are fields which have been
intimately con nected from their beginning. Nonlinear optical
effects such as second-har monic generation fulfil vital functions
in many laser systems. Conversely advances in laser development
quickly lead to progress in nonlinear optics. Of particular
importance has been the development of tunable visible and uv
lasers. With the ability to tune the laser frequency into close
resonance with atomic transition frequencies, one can produce a
large resonance en hancement of the nonlinearity. This permits the
observation of a great var iety of nonlinear optical processes in
dilute media such as atomic vapours. In recent years much of the
research effort in nonlinear optics has been directed towards the
use of such media, and it is this area which forms the subject of
the present book. We review a wide range of nonlinear optical
processes in atomic vapours, molecular gases and cryogenic liquids.
At the same time we have tried to treat the subject in sufficient
depth to be useful to research workers in the field. To achieve
this, a measure of selectivity has been introduced by emphasising
those nonlinear processes which are seen to have applications as
sources of tunable coherent radiation. Thus we have not discussed
in any detail those nonlinear processes whose main applications are
in spec troscopy, such as Doppler-free two-photon absorption."
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