  This paper presents a simplified theoretical model for the study of emission
from laser produced plasma to better understand the processes and the factors
involved in the onset of saturation in plasma emission as well as in increasing
emission due to plasma confinement. This model considers that plasma emission
is directly proportional to the square of plasma density, its volume and the
fraction of laser pulse absorbed through inverse Bremsstrahlung in the
pre-formed plasma plume produced by the initial part of the laser. This shows
that plasma density and temperature decide the threshold for saturation in
emission, which occurs for electron ion collision frequency more than 10E13 Hz,
beyond which plasma shielding effects become dominant. Any decrease in plasma
sound (expansion) velocity shows drastic enhancement in emission supporting the
results obtained by magnetic as well as spatial confinement of laser produced
plasma. The temporal evolution of plasma emission in the absence and presence
of plasma confinement along with the effect of laser pulse duration are also
discussed in the light of this model.
