111 Figure 34-56 shows a beam ex- pander made with two coaxial con- verging lenses of focal lengths fi and h and separation d = fi + f2. The de- vice 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 W; = 2.5 mm and in- tensity 1, = 9.0 kW/m? enters a beam expander for which f = 12.5 cm and f2 = 30.0 cm. What are (a) Wrand (b) I,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 fi = -26.0 cm? W; Figure 34-56 Problem 111.

111 Figure 34-56 shows a beam ex- pander made with two coaxial con- verging lenses of focal lengths fi and h and separation d = fi + f2. The de- vice 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 W; = 2.5 mm and in- tensity 1, = 9.0 kW/m? enters a beam expander for which f = 12.5 cm and f2 = 30.0 cm. What are (a) Wrand (b) I,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 fi = -26.0 cm? W; Figure 34-56 Problem 111.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

111 Figure 34-56 shows a beam ex-
pander made with two coaxial con-
verging lenses of focal lengths fi and
h and separation d = fi + f2. The de-
vice 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 W; = 2.5 mm and in-
tensity 1, = 9.0 kW/m? enters a beam expander for which f = 12.5
cm and f2 = 30.0 cm. What are (a) Wrand (b) I,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
fi = -26.0 cm?
W;
Figure 34-56 Problem 111.

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