Demonstration of a length control system for ALPS II with a high finesse 9.2 m 
cavity

Poeld, Jan Hendrik; Spector, Aaron D.

doi:10.1140/epjti/s40485-020-0054-8

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Demonstration of a length control system for ALPS II with a high finesse 9.2 m cavity

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Poeld, Jan Hendrik
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Citation

Poeld, J. H., & Spector, A. D. (2020). Demonstration of a length control system for ALPS II with a high finesse 9.2 m cavity. EPJ Techniques and Instrumentation, 7: 1. doi:10.1140/epjti/s40485-020-0054-8.

Cite as: https://hdl.handle.net/21.11116/0000-0005-A68C-2

Abstract

Light-shining-through-a-wall experiments represent a new experimental
approach in the search for undiscovered elementary particles not accessible
with accelerator based experiments. The next generation of these experiments,
such as ALPS II, require high finesse, long baseline optical cavities with fast
length control. In this paper we report on a length stabilization control loop
used to keep a 9.2 m cavity resonant. The finesse of this cavity was measured
to be 101,300$\pm$500 for 1064 nm light. Fluctuations in the differential
cavity length as seen with 1064 nm and 532 nm light were measured. Such
fluctuations are of high relevance, since 532 nm light will be used to sense
the length of the ALPS II regeneration cavity. Limiting noise sources and
different control strategies are discussed, in order to fulfill the length
stability requirements for ALPS II.