Lens-ended fibers for medical applications: a new fabrication technique

Remote detection of groundwater contaminants using far-ultraviolet laser-induced fluorescence

“…The probe design was selected largely because its simplicity and inexpensiveness would emphasize the inherent sensitivity and utility of the method. Improvements that are currently available include (1) optimization of the angle between the excitation and collection fibers, (2) surrounding of the excitation fiber by a multitude of close-packed detection fibers, (3) use of collection optics, e.g., a spherical ball (6) or a microlens-ended fiber (16), and (4) use of commercially available probes, e.g., a 45°mirror for detection at right angles to the exciting light (10).…”

Requirements of an up to date fibre optics delivery system for laser medicine

“…Connection tests have been made with bulb-ended fibres and compared with flat-ended fibres connections. The fibres had 600 ~m core diameter, of PCS type and the bulb-lens had radius of curvature of 700 -800 #~m in order to minimize the reflection losses (4). From the laboratory measurements on maximum coupling efficiency and its variations with the alignement errors, it turned out that the bulb-lens connections showed better performances with respect to the flat-flat connections.…”

Design, fabrication, and characterization of thermoplastic microlenses for fiber-optic probe imaging

“…However, the gluing of a microlens to the fiber tip is a cumbersome and expensive process that often results in a low-quality optical interface [2]. The fabrication of microimaging lenses on the top of imaging fibers by the direct lithographic and laser-micro furnace techniques was also investigated [8,9]. The fabrication procedure is quite complex and time consuming, and it is hard to control the size and position of a microlens.…”