A magnetic field-enhanced plasma reactor is disclosed, comprising a reaction chamber for applying a plasma to a substrate, a plurality of primary electromagnets disposed about said reaction chamber, and a plurality of secondary electromagnets. An optical fiber is held on a V-shaped groove on the first mounting base member for facing the light emitting layer of the laser. The active beam comprises a resistive heating bar having a relatively smaller cross-sectional area than any other part of the current flow path. The vehicle cleaning element can be configured for application to mitter cleaning elements and rotatable cleaning elements in automatic vehicle cleaning operations. In some embodiments, such methods and devices are used to create at least one channel of a desired volume within a channel in a plastic substrate. The lens has a combination of large entrance pupil diameter for efficiently collecting weak fluorescence light, large ratio between the entrance pupil diameter and the maximum outside diameter, large field of view and favorably corrected spherical, lateral chromatic and Petzval field curvature for both visible and near infrared wavelengths.