Abstract
This article presents the design and the conception of an ultra-compact Fabry-Pérot cavity which will be used to develop an ultra-stable laser. The proposed cavity is composed of a 25 mm long ULE spacer with fused silica mirrors. It leads to an expected fractional frequency stability of 1.5 x 10-15 limited by the thermal noise. The chosen geometry leads to an acceleration relative sensitivity below 10-12 /(m/s2) for all directions.
Highlights
Ultra-stable lasers are a key element in various applications ranging from optical frequency standards [1, 2], gravitational wave detection [3], tests of fundamental physics [4] and generation of ultra-pure microwave signals [5]
The cavity dimensions were optimized through finite element modeling (FEM) in order to find spacer dimension where the the mirrors tilts could be minimized
Thermal modeling The shift of the cavity coefficient of thermal expansion (CTE) turning point can be compensated by the use of ultra-low expansion (ULE) rings optically contacted to the back of the mirrors [21]
Summary
Ultra-stable lasers are a key element in various applications ranging from optical frequency standards [1, 2], gravitational wave detection [3], tests of fundamental physics [4] and generation of ultra-pure microwave signals [5]. We report the design of a reference cavity with calculated acceleration sensitivities below 10−12/(m/s2) for all directions. The overall coefficient of thermal expansion (CTE) is partially compensated by contacting rings in ULE on the back of the mirrors.
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