A NOVEL DILATOMETER FOR MEASURING COEFFICIENT OF THERMAL EXPANSION OF ULE-MATERIAL USING A FIBER RING LASER

Han-Young Ryu, Won-Kyu Lee, Han-Seb Moon, Chu-Shik Kang, Ho-Suhng Suh

Abstract

A new type of measuring system for coefficient of linear thermal expansion (CTE) of ULE (Ultra Low Expansion) material by using a fiber ring laser is introduced in this paper. The lasing frequency of the laser is stabilized to one of the transmission peaks of the etalon filter by controlling the resonant frequency of the tunable filter. The spacer of the (Fabry-Perot type) etalon filter is made of ULE material.<BR />
We could measure the CTE of ULE by measuring the optical frequency change caused by the temperature change of the etalon spacer. The combined standard uncertainty is estimated as the value of 3.66 · 10^-8.

Keywords

Fabry-Perot etalon, ULE, CTE, fiber ring laser Uncertainty

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PWC-2006-TC14-038u.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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