Coherent Cancellation of Photothermal Noise in GaAs/Al$_{0.92}$Ga$_{0.08}$As Bragg Mirrors - INSPIRE

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Coherent Cancellation of Photothermal Noise in GaAs/Al $_{0.92}$ Ga $_{0.08}$ As Bragg Mirrors

Jun 23, 2015

10 pages

Published in:

Metrologia 53 (2016) 2, 860

Published: Mar 9, 2016

e-Print:

1506.07088 [physics.optics]

DOI:

10.1088/0026-1394/53/2/860

Report number:

LIGO-P1500054

View in:

ADS Abstract Service

reference search32 citations

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Abstract: (arXiv)

Thermal noise is a limiting factor in many high-precision optical experiments. A search is underway for novel optical materials with reduced thermal noise. One such pair of materials, gallium arsenide and aluminum-alloyed gallium arsenide (collectively referred to as AlGaAs), shows promise for its low Brownian noise when compared to conventional materials such as silica and tantala. However, AlGaAs has the potential to produce a high level of thermo-optic noise. We have fabricated a set of AlGaAs crystalline coatings, transferred to fused silica substrates, whose layer structure has been optimized to reduce thermo-optic noise by inducing coherent cancellation of the thermoelastic and thermorefractive effects. By measuring the photothermal transfer function of these mirrors, we find evidence that this optimization has been successful.

Note:

10 pages, 7 figures

photothermal noise
AlGaAs
laser frequency stabilization
Fabry-Pérot cavities
gravitational waves
noise: thermal
coherence
gallium: arsenic
mirror
optics

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