Related papers: Photodiode quantum efficiency for 2-μm light in the signal band of gravitational wave detectors

Photodiode quantum efficiency for 2-μm light in the signal band of gravitational wave detectors

URL: http://arxiv.org/abs/2511.05961v1
Date: Sat, 08 Nov 2025 10:34:02 GMT
Title: Photodiode quantum efficiency for 2-μm light in the signal band of gravitational wave detectors
Authors: Julian Gurs, Nils Sueltmann, Christian Darsow-Fromm, Sebastian Steinlechner, Roman Schnabel,
Abstract summary: Quantum technologies with quantum correlated light require photodiodes with near-perfect true' quantum efficiency.<n>Future squeezed-light-enhanced gravitational wave detectors could in principle achieve higher sensitivities with a longer laser wavelength around 2 mum.<n>Photodiodes made of extended InGaAs are available for this range, but the true quantum efficiency at room temperature and the low frequency band of gravitational waves is strongly reduced by dark noise.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Quantum technologies with quantum correlated light require photodiodes with near-perfect `true' quantum efficiency, the definition of which adequately accounts for the photodiode dark noise. Future squeezed-light-enhanced gravitational wave detectors could in principle achieve higher sensitivities with a longer laser wavelength around 2 {\mu}m. Photodiodes made of extended InGaAs are available for this range, but the true quantum efficiency at room temperature and the low frequency band of gravitational waves is strongly reduced by dark noise. Here we characterize the change in performance of a commercial extended-InGaAs photodiode versus temperature. While the dark noise decreases as expected with decreasing temperature, the detection efficiency unfortunately also decreases monotonically. Our results indicate the need for a dedicated new design of photodiodes for gravitational wave detectors using 2-{\mu}m laser light.

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