Precise control of hyperfine matterwaves via Raman excitations is
instrumental to a class of atom-based quantum technology. We investigate the
Raman spinor control technique for alkaline atoms in an intermediate regime of
single-photon detuning where a choice can be made to balance the Raman
excitation power efficiency with the control speed, excited-state adiabatic
elimination, and spontaneous emission suppression requirements. Within the
regime, rotations of atomic spinors by the Raman coupling are biased by
substantial light shifts. Taking advantage of the fixed bias angle, we show
that composite biased rotations can be optimized to enable precise ensemble
spinor matterwave control within nanoseconds, even for multiple Zeeman
pseudo-spins defined on the hyperfine ground states and when the laser
illumination is strongly inhomogeneous. Our scheme fills a technical gap in
light pulse atom interferometry, for achieving high speed Raman spinor
matterwave control with moderate laser power.Comment: 11 pages, 6 figure