  Laser light scattering systems with volume Bragg grating (VBG) filters, which
act as a spectral/angular filter, have often been used as a point measurement
technique with spatial resolution as low as a few hundred um defined by the
beam waist. In this work, we demonstrate how VBG filters can be leveraged for
spatially resolved measurements with several um resolution perpendicular to the
laser propagation axis over a few mm along the beam propagation axis. The
rejection ring, as determined by the angular acceptance criteria of the filter,
is derived analytically, and the use of the ring for 1D laser line rejection is
explained. For the example cases presented, having a focused probe beam waist
with a diameter of ~150 um, the rejection ring can provide up to several mm
length along the beam propagation axis for a 1D measurement, which is also
tunable. Additionally, methods to further extend the measurable region are
proposed and demonstrated; using a collimation lens with a different focal
length or using multiple VBG filters. The latter case can minimize the
scattering signal loss, without the trade-off of the solid angle. Such use of
multiple VBGs is to extend the measurable region along the beam axis, which
differs from the commonly known application of multiple filters to improve the
suppression of elastic interferences. 1D rotational Raman and Thomson
scattering measurements are carried out on pulsed and DC discharges to verify
this method. The system features compactness, simple implementation, high
throughput, and flexibility to accommodate various experimental conditions.
