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Fig. 20

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If the LO shift νLO is not a multiple of the standing wave frequency νsw, the quantity f − fcal can have several roots causing “resonances” in the final spectrum. The left panels have νsw = 10   MHz matching νLO = 10   MHz, while for the right panels we chose νsw = 50   MHz. The upper panels show the resulting spectra (simulations were performed without a noise contribution for a clearer visualisation). In the upper right panel, spikes do appear. The middle panels show the model fitting through . While in the left middle panel fcal > f for all frequencies, in the right middle panel several crossings occur. The lower panels depict Eq. (56), which represents the condition for resonances to appear.

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