  We theoretically study a pulsed stimulated two-photon Raman outcoupler for an
atom laser using a full three-dimensional description. A finite-temperature
trapped Bose-condensed atomic gas is treated self-consistently by the
Hartree-Fock-Bogoliubov equations. The model is closely related to a recent
experiment on optical outcoupling [E.W. Hagley et al., Science 283, 1706
(1999)]. We analyze the momentum distribution of the output atoms and show how
the output beam may be used as a probe of the quantum state for the trapped
atomic gas and how it could be engineered and controlled in a nonlinear way.
