**15.5)** A Nd:YAG laser beam( )is perfectly coherent, with
initial beam diameter of 0.8 mm. If the laser is on the ground and
directed up at a plane flying over at an altitude of 29,000 feet,
what is the size of the beam when it hits the plane?

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Wavelength of the laser beam, lambda=1.064 mum range of laser beam, Z_(R)=29000feetZ_(R)=8839.2" meter "omega_(0)= size of beam when it hits the plane{:[z_(R)=(piomega_(0)^(2))/(lambda)],[omega_(0)^(2)=(Z_(R)lambda)/(pi)],[omega_(0)^(2)=(8839.2 xx1.064 xx10^(-6))/(3.14)quad[:'1mum=10^(-6)(m)]],[omega_(0)^(2)=(9404.9088 xx10^(-6))/(3.14)],[omega_(0)=sqrt(2995.193 xx10^(-6))],[omega_(0)=54. ... See the full answer