Focusing device for obtaining isotropic light spot in fields of biology and nanotechnology, has reflecting device located at midway between focal points for forming isotropic light spot by reflecting light spot on another light spot

摘要

The device (1) has a light source (4) for generating incident beam propagating along an optical axis (3), and an incident beam forming device (6) i.e. phase shift mask, arranged between the light source and a convergent lens (5) i.e. immersion lens. The incident beam forming device modifies the incident beam to define a focal point (7) and another focal point, where the focal points are different from each other. A reflecting device (11) e.g. deformable mirror, is located at a midway between focal points to form an isotropic light spot (2) by reflecting a light spot on another light spot.