The following are some calculator that will help you calculate the Peak Power for Gaussian Pulse and the Peak Power for Sech Pulse (in Watts) by inputting the value of Pulse Energy (in Joules) and Pulse Duration (in Seconds).
Peak Power For Gaussian Pulse
The formula that will be used for Peak Power for Gaussian Pulse is as followed:
$P_{Gaussian}$ = $(\frac{0.94E}{\triangle t})$
Peak Power For Sech Pulse
The formula that will be used for Peak Power for Sech Pulse is as followed: