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e894a4j

# e894a4j - originates from a point source By using the...

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ENSC 460/894 Assignment 4: (Mar. 23, 2008 due Mar. 31, 2008) 1(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 μ m? 2 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. 3. The system geometries used to record transmission and reflection holograms are illustrated in the figure below. The reference beam U R is collimated and object beam U
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Unformatted text preview: originates from a point source. By using the hologram equations in the notes and drawing sketches, describe the results when the transmission and reflection holograms are constructed with: (a) U P = U R (b) U P = U R * (c) U P = U O (d) U P = U O * 4 (a) Using energy equations what is the surface temperature versus time for a 150 watt argon laser with a 1 mm 1/e 2 laser spot, at the center of the spot when hitting a silicon surface for a pulse of duration 5x10-6 sec. Give the diffusion depth at the end of the pulse. (b) Repeat (a) but with the material surface being aluminium. (c) Add to the plots the temperature vs time curve for half and one diffusion depth....
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