the main body b which comprises a solid state laser medium flash lamp and reflector not shown outputs the laser beam l from the output window which is provided at the both end faces of the main body b the reflector in the main body b is provided for reflecting the light emitted from the flash lamp uniformally radiate the solid state laser medium without loss of energy referring to fig4 conventional reflectors are based on curves such as a parabola a semicircle b and cusp c all of these curves can provide satisfactorily uniform illumination of the slab laser medium if the dimensions of flashlamp laser medium and reflector are properly chosen however in the general laser system the dimensions of these are not properly chosen and the reflector dimensions are usually strong functions of the flashlamp diameter therefore often the reflector design is a compromise between the optimal design flashlamp or laser medium dimensions additionally most designs assume that a two dimensional design approach in the x y plane is sufficient since the three dimensional intensity distribution is simply an extension in the z direction of the two dimensional intensity distribution for example as shown in fig5 a when there is arranged a flashlamp 3 which is arranged along the longitudinal that is.