Cadmium red light has a mean wavelength of Î»Ì 0 = 643.847 nm (see Fig. 7.45) and

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Cadmium red light has a mean wavelength of λ̅0= 643.847 nm (see Fig. 7.45) and a linewidth of 0.001 3 nm. When used to illuminate a Michelson Interferometer it is found that increasing the mirror separation from zero to some amount D causes the fringes to vanish. Show that

Δλο ΔΙ

and then determine D for the cadmium line.

 Fig. 7.45

Imax Imax A (nm) --0.002 –0.001 +0.001 +0.002 643.847 +0.000 65 nm at Imax/2

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Optics

ISBN: 978-0133977226

5th edition

Authors: Eugene Hecht

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