Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. Find the initial spacing of plate. I'm quite confused by this question, as usually either the spacing or wavelength is fixed Quite a lousy etalon right?
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The Fabry-Perot etalon is the most basic optical resonator. The varying transmission function of an etalon is caused by interference between the multiple reflections of light between two reflecting surfaces:. We can start by adding two optical mirrors and a straight waveguide from the element library to the schematic editor to construct the Fabry-Perot cavity. Alternatively, we can also use the Fabry-Perot Resonator element from the element library to model the resonator directly:. Where T and R are the mirror power transmission and reflection respectively. The round-trip phase shift is:. The power transmitted is:.
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Optical waves can pass through the optical cavity only when they are in resonance with it. It is named after Charles Fabry and Alfred Perot , who developed the instrument in Etalons are widely used in telecommunications , lasers and spectroscopy to control and measure the wavelengths of light. The device is technically an interferometer when the distance between the two surfaces and with it the resonance length can be changed, and an etalon when the distance is fixed however, the two terms are often used interchangeably.
Optical filters mostly provide wavelength-dependent attenuation of light. They can be absorbing glass filters, interference filters, Fabry—Perot filters, Lyot filters or based on other designs. The applications are manifold, including eye protection against laser radiation, gain equalization of telecom fiber amplifiers, solar-blind photodetectors and spectral analysis. More specific products: gain equalization filters , interference filters , Lyot filters , neutral density filters , rugate filters , tunable optical filters. Related product category: optical components and devices.