  I am not asking anything. It is just that we have a number of lasers in our labs. Two of them (nitrogen laser, and a dye laser) make ns pulses and uses a single pass amplifier. One of them makes 100 ps and needs multiple passes through Nd:YLF. And then there are the Ti:Sa amplifiers who need multiple pulses and chirped pulses. So the shorter the pulses and the lower the induced emisson cross section the more effort is needed to deplete the medium. Any proposal for a better wording?  