The beam emerging from a 1.5 W argon laser ( = 515 nm) has a diameter d

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The beam emerging from a 1.5 W argon laser (λ = 515 nm) has a diameter d of 3.0 mm. The beam is focused by a lens system with an effective focal length fL of 2.5 mm. The focused beam strikes a totally absorbing screen, where it forms a circular diffraction pattern whose central disk has a radius R given by 1 .22 fL λ/d. It can be shown that 84% of the incident energy ends up within this central disk. At what rate are photons absorbed by the screen in the central disk of the diffraction pattern?
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Probability & Statistics For Engineers & Scientists

ISBN: 9780130415295

7th Edition

Authors: Ronald E. Walpole, Raymond H. Myers, Sharon L. Myers, Keying

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