Detection of 15 dB Squeezed States of Light and their Application for the Absolute Calibration of Photoelectric Quantum Efficiency.
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...[62] H....
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...To reduce the optical losses optimizing the squeezing performance, the photodiodes installed at the interferometer dark port to measure the gravitational wave signals were replaced by high quantum efficiency ones [62]....
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"Detection of 15 dB Squeezed States ..." refers methods in this paper
...45%: For this we took into account the loss of the PPKTP crystal comprising the residual transmission through the HR-coated backside 400þ100 −100 ppm, which was measured in a separate experiment, the (negligible) absorption within the crystal (12 ppm=cm [34,35]), and the residual reflection of the AR-coated frontside (two times 400þ200 −200 ppm), and the coupling mirror transmissivity T 1⁄4 12....
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