  We present an inline optical device consisting of four optical components
that produce a laser field consisting of two sub-beams where one is radially
polarized and the other is linearly polarized. In the focus, the radially
polarized sub-beam produces longitudinal polarization while the linearly
polarized sub-beam produces polarization perpendicular to the propagation
direction. By rotating the optical components, the orientation of the resulting
electric field in the focus can be continuously varied in any direction.
Estimates of the angular resolution of the device are given in the paraxial
approximation.
