近年來大模態雙纖衣光纖被廣泛用來作為放大器增益介質，以實現全光纖化的高功率主從式雷射放大器系統。其小型化與高穩定的特性加速了高功率雷射商品化的腳步，且因其能源轉換效率高、光束品質佳與操作可調性大，更帶動了許多雷射應用領域的突破與進展。本文將介紹摻鐿光纖用於高功率奈秒全光纖主從式雷射放大器系統的進展與成果，包括設計考量、系統架構及輸出特性與在雷射應用端的簡介。

In recent years, large-mode-area double-clad fi bers have been widely utilized as gain medium of laser amplifi ers to realize the high power fi ber based master oscillator power amplifi er (MOPA) system. The system’s compactness,stability and reliability accelerate the progress on the commercialization of high power lasers. Furthermore,many breakthroughs and developments of high power laser application have been driven owing to its high energy conversion effi ciency, excellent beam quality, and versatile operations. In this article, we introduce the development
of high power nanosecond fiber based MOPA system using ytterbium-doped fibers, including the design considerations, general confi gurations, and output characteristics for laser applications.