<title>Controlled-in-time laser technique for fiber-end microlens fabrication</title>

Abstract

A new approach to fiber-end microlenses fabrication is described below. The general idea is to combine laser action on glass samples ( for example, fiber ) with such mechanical forces action as stretching, twisting, bending, etc. Several different schemes for combination are suggested and tested'.The next innovation is to observe and to measure microlens geometrical and optical parameters during the laser processing and use the results for control on the microlens production. This allows one to combine producing and measurement ( testing ) operations in time and place , that provide higher productivity and an increase of available elements output.In this way, a number of new fiber-end microlenses such as arc, bulb ( spherical and non-spherical ), and elliptic shapes for beam focusing, various types of side-fiber tools, scatterers ( all-side, half-space, point, etc. ), lens-end fo-cons2 are created. Geometro-optical calculations of these fiber optical components ( FOC ) provided the ability to optimize their forms using an optical feed-backs of the laser technological installation. . THE WAY A TASK I S FORMULATEDThere are two main tasks which can be formulated for FOC: 1. Optimization of the profiles of FOC's refractive surfaces for solving various tasks in medicine and technology.2. Fiber ( or other source ) -fiber coupling for maximum efficiency of energy transportation. In particular, this problem occurs when it is necessary to provide the effective input of fiber with large diameter di into fiber having a lesser diameter d2. Also, it is important to note the task of laser diodes radiation input into the single-mode or small diameter multi-mode fibers.

Optical Fiber Tips as Medical Tools Based on Laser Technology

“…In the present paper, a laser-assisted technology is proposed that permits to form a FA in a way that a certain intensity pattern at the output side of fiber is achieved by a well defined procedure. Preliminary results of the studies have been published previously by the same team [1,9,10].…”