[Neuroscience] Smooth in mathematica program

[Hind]

Hi,

I plot my function in 3D, for example:

Plot3D[300 + (Io s  c Exp[(-s) x]) Sin[a t], {t, 0, 4×10^-12}, {x, 0,
1.5×10^-6}, PlotPoints -> 30])

out = SurfaceGraphics.................. I obtained the figure(curve),
it look OK, but, it need to be smoothed (oscillation should be
avoided).

Now my quastion How i can make smooth for this figure in Mathematica
program?


Thank you
 Hind