Publication

Brillouin gain curve measurements in fibres at cryogenic temperatures

Luc Thévenaz, Philippe Robert
2001
Conference Papers

Abstract

Brillouin gain curves of a standard optical fibre have been measured down to 3 K. In comparison with their well-documented characteristics at room temperature, they show original and interesting features, namely non-monotonous variations of the central frequency shift and of the linewidth. These preliminary measurements indicate that Brillouin-based temperature sensors can advantageously be used in cryogenics with some adaptations.

Official source

https://infoscience.epfl.ch/entities/publication/2e765255-9b78-428a-ba3b-3f92585e9a4e

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Luc Thévenaz, Philippe Robert
2001
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2e765255-9b78-428a-ba3b-3f92585e9a4e

About this result

Related concepts (19)

Density of states

In solid-state physics and condensed matter physics, the density of states (DOS) of a system describes the number of modes per unit frequency range. The density of states is defined as , where is the number of states in the system of volume whose energies lie in the range from to . It is mathematically represented as a distribution by a probability density function, and it is generally an average over the space and time domains of the various states occupied by the system.

Optics

Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.

Cryogenics

In physics, cryogenics is the production and behaviour of materials at very low temperatures. The 13th IIR International Congress of Refrigeration (held in Washington DC in 1971) endorsed a universal definition of "cryogenics" and "cryogenic" by accepting a threshold of 120 K (or –153 °C) to distinguish these terms from the conventional refrigeration. This is a logical dividing line, since the normal boiling points of the so-called permanent gases (such as helium, hydrogen, neon, nitrogen, oxygen, and normal air) lie below 120 K, while the Freon refrigerants, hydrocarbons, and other common refrigerants have boiling points above 120 K.

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Brillouin gain curve measurements in fibres at cryogenic temperatures

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