Recent content by physics0o

Is this about Gaussion Beam? I am not sure what the question is and what i have to do. The volume is related to waist, isn't it? so could someone kind enough to give me some hints that how I can start? Thank you!

Homework Statement In many laser applications the volume occupies by a laser beam in a gaiven crystal should be minimized. so how i can define that volume for a gas cell(n=1,00) that is 4cm long, using a laser wavelength of 633nm and placing the focus in the middle of the cell. Homework...