Abstract
Laser technologies are extensively used in the various fields such as material processings, medical
treatments, and measurements. Especially, the developments of the high power laser with excellent
beam quality such as fiber lasers have advanced in the laser machining fields, which are for the
production line of the automotive body and the lithium ion battery. In the fields, the laser power
transmission technologies by using laser delivery fi bers are indispensable and the higher reliability is
increasingly required. In this report, we introduce the overview about the preparation methods, which
are a laser polishing and an end-cap structure, for the optical fi ber end face and the connector technology
that is a cladding mode stripper. These technologies can be expected to support the reliability of the
laser delivery fi bers.
