Question A9 A laser with 589 nm wavelength and a beam diameter of 2 mm is fed through a beam-expander, then aimed from the G.O. Jones building to the Canary Wharf tower at a distance of 2.75 km. What expansion factor is required for the beam-expander in order that the diffraction-limited spot at Canary Wharf tower has a diameter of 30 cm (defined as the diameter of the first dark ring) ?
Question A9 A laser with 589 nm wavelength and a beam diameter of 2 mm is fed through a beam-expander, then aimed from the G.O. Jones building to the Canary Wharf tower at a distance of 2.75 km. What expansion factor is required for the beam-expander in order that the diffraction-limited spot at Canary Wharf tower has a diameter of 30 cm (defined as the diameter of the first dark ring) ?
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Transcribed Image Text:Question A9
A laser with 589 nm wavelength and a beam diameter of 2 mm is fed through a beam-expander,
then aimed from the G.O. Jones building to the Canary Wharf tower at a distance of 2.75 km.
What expansion factor is required for the beam-expander in order that the diffraction-limited spot
at Canary Wharf tower has a diameter of 30 cm (defined as the diameter of the first dark ring) ?
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