  We present a new technique based on fixed-delay interferometry for high
throughput, high precision and multi-object Doppler radial velocity (RV)
surveys for extra-solar planets. The Doppler measurements are conducted through
monitoring the stellar fringe phase shifts of the interferometer. High Doppler
sensitivity is achieved through optimizing the optical delay in the
interferometer and reducing photon noise by measuring multiple fringes over a
broadband. This broadband operation is performed through coupling the
interferometer with a low to medium resolution post-disperser. The total
Doppler sensitivity of this approach is, in theory, independent of dispersing
power of the post-disperser, which allows development of new generation RV
machines with much reduced size, high stability and low cost compared to
echelles. This technique has the potential to improve RV survey efficiency by
2-3 orders of magnitude over cross-dispersed echelle spectroscopy approach to
allow a full sky RV survey for planets once the instrument is operated as a
multi-object instrument and optimized for high throughput.
  The simple interferometer response potentially allows this technique to be
operated at other wavelengths independent of popular iodine reference sources
to search for planets around early type stars, white dwarfs, and M, L and T
dwarfs for the first time.
