  We propose a new architecture, double-pass multiple-plate continuum (DPMPC),
for nonlinear pulse compression. In addition to smaller footprint, a
double-pass configuration is designed to achieve substantial bandwidth
broadening without incurring noticeable higher-order dispersion, thus improving
the temporal contrast over those of traditional single-pass geometry when only
quadratic spectral phase can be compensated. In our proof-of-concept
experiment, 187~$\mu$J, 190-fs Yb-based laser pulse is compressed to 20~fs with
high throughput (75%), high Strehl ratio (0.76) and excellent beam homogeneity
by using DPMPC. Subsequently generated octave-spanning spectrum exhibits a
significantly raised blue tail compared with that driven by pulses from a
single-pass counterpart.
