Sulfur hexafluoride (SF6) is a high-density gas that has refractive index, ns = 1.8 at a specified

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Sulfur hexafluoride (SF6) is a high-density gas that has refractive index, ns = 1.8 at a specified pressure, temperature, and wavelength. Consider the retro-reflecting prism shown in Fig. 12.16, that is immersed in SF6. Light enters through a quarter-wave antireflective coating and then totally reflects from the back surfaces of the glass. In principle, the beam should experience zero loss at the design wavelength (Pout= Pin).

п, |п пе Pin 214 Рода out


(a) Determine the minimum required value of the glass refractive index, ng, so that the interior beam will totally reflect.

(b) Knowing ng, find the required refractive index of the quarter-wave film, nf.

(c) With the SF6 gas evacuated from the chamber, and with the glass and film values as previously found, find the ratio, Pout/Pin. Assume very slight misalignment, so that the long beam path through the prism is not retraced by reflected waves.

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Engineering Electromagnetics

ISBN: 978-0073380667

8th edition

Authors: William H. Hayt, John A.Buck

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