We have controlled the amount of spatial hole burning in a diode end-p
umped Nd:YAG laser to quantitatively analyze its role in active mode l
ocking. We demonstrate inhomogeneous broadening of the lasing bandwidt
h to >60 GHz, accompanied by a pulse-width reduction from 40 to 15 ps
and an approximately 30% increase in the time-bandwidth product. Both
homogeneous and inhomogeneous broadening have been included in a succe
ssful calculation of the steady-state pulse width.