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e894a4h

# e894a4h - o between the fast and slow rays for a ruby laser...

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ENSC 460/894 Assignment 4: (Mar. 8, 2005 due Mar. 15, 2005) 1 Assume the divergence (diffraction spreading) of a HeNe laser ( λ = 632.8 nm) can be approximated by estimating it is equivalent to the diffraction caused by a plane monochromatic wave incident on a circular aperture of diameter equal to the laser beam diameter. (a) Calculate the divergence for a 2 mm beam. (b) Compare this divergence to that obtained from the Raleigh Range. 2 (a) In an electro-optic Pockels cell calculate the refractive index change per cm in Lithium Niobate (LiNbO 3 ) for an applied field of 100 V/cm (use note values for parameters). (b) How long must a longitudinal Pockels cell be to cause a phase change of 90
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Unformatted text preview: o between the fast and slow rays for a ruby laser ( Î» = 694.3 nm). Assume the cell is at 45 o to the laser polarization to begin with. 3 (a) What angle should a HeNe laser beam make relative to the normal to the surface of an acousto-optical modulator operated at 40Mhz with a acoustical wavelength of 60 Âµ m? 4 Assume light from a HeNe laser hits a single slit 0.5 mm wide by 3 cm long. Light from the slit is focused by a f=50 cm lens. Calculate the location (distance from the central maximum) of the first minimum and first maximum (after the central one) in the projected image....
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