  We present results of a 3D model of optical to gamma-ray emission from the
slot gap accelerator of a rotation-powered pulsar. Primary electrons
accelerating to high-altitudes in the unscreened electric field of the slot gap
reach radiation-reaction limited Lorentz factors of 2 x 10^7, while
electron-positron pairs from lower-altitude cascades flow along field lines
interior to the slot gap. The curvature, synchrotron and inverse Compton
radiation of both primary electrons and pairs produce a broad spectrum of
emission from infra-red to GeV energies. Both primaries and pairs undergo
cyclotron resonant absorption of radio photons, allowing them to maintain
significant pitch angles. Synchrotron radiation from pairs with a power-law
energy spectrum with Lorentz factors 10^2 - 10^5, dominate the spectrum up to
10 MeV. Synchrotron and curvature radiation of primaries dominates from 10 MeV
up to a few GeV. We examine the energy-dependent pulse profiles and
phase-resolved spectra for parameters of the Crab pulsar as a function of
magnetic inclination and viewing angle, comparing to broad-band data. In most
cases, the pulse profiles are dominated by caustics on trailing field lines. We
also explore the relation of the high-energy and the radio profiles, as well as
the possibility of caustic formation in the radio cone emission. We find that
the Crab pulsar profiles and spectrum can be reasonably well reproduced by a
model with viewing angle 45 degrees and inclination angle 100 or 80 degrees.
This model predicts that the slot gap emission below 200 MeV will exhibit
correlations in time and phase with the radio emission.
