laser

[vani]

what can be the output beam diameter for microchip PULSED laser in underwater lidar application?

[Integral]

I do not think that an answer exits for the given information.

[suyver]

It can be \pi/e.
It can be something else too.

[vani]

what does e specify?e charge or exp const?
what type of polarization&output power for pulsed laser source can be used in lidar application under sea?