Figure 46: Left panel: the SQL beating factors for . Thick solid: the second-order
pole system (511); dots: the two-pole system with optimal separation between the poles (528),
(529); dashes: the harmonic oscillator (170); thin solid – SQL of the harmonic oscillator (171).
Right: the normalized SNR (526). Solid line: analytical optimization, Eq. (530); pluses: numerical
optimization of the spectral density (514) in the lossless case ( ); diamonds: the same for
the interferometer with , and the losses part of the bandwidth
(which corresponds to the losses per bounce in the 4 km long arms).
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