Figure 34-55 shows a beam expander made with two coaxial
Chapter 34, Problem 111(choose chapter or problem)
Figure 34-55 shows a beam expander made with two coaxial converging lenses of focal lengths fl and f2 and separation d = fl + f2' The device can expand a laser beam while keeping the light rays in the beam parallel to the central axis through the lenses. Suppose a uniform laser beam of width Wi = 2.5 mm and intensity Ii = 9.0 kW/m2 enters a beam expander for which fl = 12.5 cm and f2 = 30.0 cm. What are (a) Wf and (b) If of the beam leaving the expander? (c) What value of d is needed for the beam expander if lens 1 is replaced with a diverging lens of focal length fl = -26.0 cm?
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