2. Consider a Gaussian laser beam of wavelength 514.5 nm with a minimum spot size 0,= 2 mm located at z = 0 (a) At what distance will the beam waist become 1 cm? (b) What is the radius of curvature of the wavefront at this position? (c) Given that the power of the laser is 1 Watt, calculate the on axis laser intensity I and the amplitude of the electric field E at z = 0. 3. A Gaussian laser beam of wavelength 488 nm is measured to have a power of 10 Watt, with a minimum beam 0-2 mm waist located at z = 0 (a) At what distance will the beam waist become 4mm? (b) An aperture of diameter 20(2) is centrally placed in front of the laser. What fraction of the 10-Watt power is allowed to transmit through the aperture?