A trough reflector with a reflective, truncated elliptical surface was designed to efficiently collect freely propagating light from a linear source. The source was placed at one focus of the reflector, and light was collected through a rectangular aperture near the second focus. Collection efficiency was much greater than that of a spherical integrator and ≈6.5× greater than that of an objective lens; as much as ≈55% of the light could be captured from the full aperture. This reflector could be used to efficiently collect surface fluorescence excited by use of evanescent waves in fluorescence-based fiber optic or capillary waveguide sensors.
© 1998 Optical Society of America
H. Pin Kao and Joseph S. Schoeniger, "Elliptical Trough Reflector for the Collection of Light from Linear Sources," Appl. Opt. 37, 4194-4199 (1998)