Abstract
This paper reports the fabrication of various micro-lensed single-mode
optical fibers through the use of an enhanced peak power
<TEX>$CO_2$</TEX> laser beam. The end faces of the optical fibers are
exposed to the <TEX>$CO_2$</TEX> laser beam to form convex, concave, and
conical shape optical fiber tips. Peak power of the <TEX>$CO_2$</TEX>
laser beam was varied from 0.8 W to 1.5 W depending on the shape of the optical
fiber tip. We also discover the dependence of the angle of the optical fiber tip on
the rotation angle and the number of <TEX>$CO_2$</TEX> laser
irradiations. The angle shows an increasing trend with both these parameters. We
achieve a wide range of lenticular fibers with end face angle varying from
<TEX>$4.47^{\circ}$</TEX> to <TEX>$8.13^{\circ}$</TEX>.
Furthermore, we investigate the emission pattern of light from the developed
micro-lensed fibers. The proposed <TEX>$CO_2$</TEX> laser based optical
fiber reshaping technique shows great consistency, and thus is suitable for
commercial applications.
© 2015 Optical Society of Korea
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