Laser in underwater lidar application?

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vani
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what can be the output beam diameter for microchip PULSED laser in underwater lidar application?
 
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It can be [itex]\pi/e[/itex].
It can be something else too.
 
laser

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?