Laser used in optical communication field introduces excitation light from source to light guide via light transduction section whose incident area is larger than guide

摘要

An excitation light ray (11) is introduced into a light guide material (2) from a pumping source (1) through light transduction surface (4). The area of light incident surface (41) of light transduction section is made larger than area of light incident surface (42) of light guide. Independent claims are also included for the following: (a) Optical amplifier; (b) Laser processing apparatus