Question

The manual of Fabry-Perot interferometer references the value of finesse F equal to 360. The thickness of air gap between mirrors is insured by the glass spacer is 10 um. Calculate the amplitude reflection coefficient r provided by one mirror.

Answer #1

We use the relation between coefficient of finesse and reflection coefficient (r) .

The value of reflection coefficient (r)=0.95

Your feedback is highly appreciated.

A Fabry-perot interferometer has a 1.4cm spacing between the
mirrors and a reflection
coefficient of r = 0.95. For a wavelength around 532nm;
(a) (5 points) What is the minimum resolvable wavelength interval
△λ?
(b) (5 points) What is the resolving power R?
(c) (5 points) What is the coefficient of finesse F?
(d) (5 points) With this resolving power found in part (b), what is
the order of peak
m?

Assume an air-filled Fabry-Perot interferometer made from two
similar, parallel mirrors. For a wavelength of 610nm, the fraction
of transmitted light to incident light is 0.0154. The distance of
separation is ℓ = 2.60μm. What is (a) the finesse, F, and (b) the
reflectance of the mirrors, R, when assuming only reflective
contributions to the etalon's finesse?

1. A Fabry-Perot etalon (or resonator) is formed by two mirrors
in air. The distance between mirrors is 1.25 (mm), and the
reflectance of each mirror is 0.92.
What is the mode of the etalon that is closest to the wavelength
of 1.55 (µm)?
2. What is the separation of the modes in the etalon?
3. The finesse, F, of the etalon is defined as the
ratio of mode separation to spectral width of each mode, and
depends on the...

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