Extended Data Figure 2: Slowing laser spectra.
a, Scale diagram showing the frequency extent of the 
, 
and 
slowing lasers (vertical red bars) relative to the four SR/HF manifolds of the X2Σ(v = 0, 1, 2; N = 1) states of SrF (horizontal black bars to right). The relative splittings of the four SR/HF levels in the X2Σ(N = 1) state are the same to within ∼1 MHz for v = 0, 1, 2 (ref. 31). The dashed lines mark the centres of the N = 1 SR/HF levels for the labelled velocity, and the level structure shown corresponds to v = 0 m s−1. b, Optimized spectral profiles of the three slowing lasers. The upper x axis shows velocity for a Doppler shift equivalent to the frequency labelled on the lower x axis. The 
light is modulated via a fibre EOM with fmod = 3.5 MHz. The 
and 
lasers are each modulated by passing through two bulk EOMs with resonant frequencies at ∼40 MHz and ∼9 MHz.
