Kavli Affiliate: Rana X. Adhikari
| First 5 Authors: Jonathan W. Richardson, Swadha Pandey, Edita Bytyqi, Tega Edo, Rana X. Adhikari
| Summary:
Squeezed light is critical in gravitational-wave detection for reaching
sensitivities below the standard quantum limit. Achieving the quantum noise
targets of third-generation detectors will require 10 dB of squeezing as well
as megawatt laser power in the interferometer arms – both of which require
unprecedented control of the internal optical losses. In this work, we present
a novel optimization approach to gravitational-wave detector design aimed at
maximizing the robustness to common, yet unavoidable, optical fabrication and
installation errors, which have caused significant loss in Advanced LIGO. As a
proof of concept, we employ these techniques to perform a two-part optimization
of the LIGO A+ design. First, we optimize the arm cavities for reduced
scattering loss in the presence of point absorbers, as currently limit the
operating power of Advanced LIGO. Then, we optimize the signal recycling cavity
for maximum squeezing performance, accounting for realistic errors in the
positions and radii of curvature of the optics. Our findings suggest that these
techniques can be leveraged to achieve substantially greater quantum noise
performance in current and future gravitational-wave detectors.
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