Figure 42: Examples of the sum quantum noise power (double-sided) spectral densities of the
Sagnac speed-meter interferometer (thick solid line) in comparison with the Fabry–Pérot–Michelson
based topologies considerd above (dashed lines). Left: no optical losses, right: with optical losses,
, the losses part of the bandwidth (which corresponds to the losses
per bounce in the 4 km length arms). “Ordinary”: no squeezing, .
“Squeezed”: 10 dB squeezing, , . “Post-filtering”: 10 dB squeezing, ,
ideal frequency-dependent homodyne angle [see Eq. (408)]. For the Fabry–Pérot–Michelson-based
topologies, and . In the speed-meter case, and the
bandwidth is set to provide the same high-frequency noise as in the other plots (
in the lossless case and in the lossy one).
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