초록 ▼

A laser beam (FIG. 1; 28) is reflected from a first oscillating galvanometer controlled mirror (14) onto a second oscillating galvanometer controlled mirror (15). The laser beam is reflected from the second mirror as a pattern (29) having an annular cross section by individually controlling the ampl

A laser beam (FIG. 1; 28) is reflected from a first oscillating galvanometer controlled mirror (14) onto a second oscillating galvanometer controlled mirror (15). The laser beam is reflected from the second mirror as a pattern (29) having an annular cross section by individually controlling the amplitude and phase relationships of the oscillations of the mirrors. The annular beam is directed at a frustoconical reflector (21) which reflects the annular beam radially inward to heat a portion of a glass preform (25) positioned along the axis of the reflector to form a melt zone therein from which an optical fiber (36) is drawn. Additionally, the amplitude of the mirror oscillations are modulated to vary the diameter of the annular beam to cause the beam to reciprocate along a portion of the length of the preform to expand the size of the melt zone.

대표청구항 ▼

A method of drawing a fiber from a preform, comprising the steps of: reflecting a beam of high energy radiation from a first oscillating mirror onto a second oscillating mirror; controlling the oscillations of the mirrors to cause a predetermined pattern to be reflected from the second mirror; direc

A method of drawing a fiber from a preform, comprising the steps of: reflecting a beam of high energy radiation from a first oscillating mirror onto a second oscillating mirror; controlling the oscillations of the mirrors to cause a predetermined pattern to be reflected from the second mirror; directing the patterned beam onto the preform to form a melt zone therein; and drawing the fiber from the melt zone.