  We report on a novel detection system for collinear laser spectroscopy which
provides an almost $4\pi$ solid angle for fluorescence photon detection by
employing curved surface mirrors. Additional parabolic angular filters offer
passive stray light suppression and can be configured to match the experimental
conditions. The mirror surfaces have an excellent reflectivity over a broad
band of wavelengths in the optical spectrum and can be substituted to expand
the wavelength acceptance range even further. Experiments with this system were
performed at two collinear laser spectroscopy setups, including the laser
spectroscopic investigation of $^{36}$Ca using rates of 25/s at NSCL, MSU.
