The object in an arrangement for pumping an anisotropic laser crystal is to reduce
the influence of the destruction limit of the laser crystal on increased pump power
density and, in this connection, to achieve improved beam quality and increased
efficiency of a diode-pumped solid state laser. At the same time, the pump volume
and cross-sectional area are to be kept as small as possible along a length of
the crystal corresponding at least approximately to the absorption length. The
arrangement operates with an asymmetric pump beam whose pump beam cross section
has different dimensions perpendicular to one another and with a laser beam cross
section which is adapted to this asymmetry. That axis of the crystallographic axes
of the anisotropic laser crystal in whose direction the highest value of the crystal
breaking limit exists is oriented along the greatest temperature gradient in the
direction of the smaller dimension of the pump beam cross section.