使用GHz鎖模光纖雷射來產生超連續光源之研究

Abstract

我們利用一GHz等級高功率短脈衝的非同步鎖模光纖雷射，配合光纖放大器/脈衝壓縮器，和一段高非線性光纖來產生超連續光譜，此超連續光譜可涵蓋從1120 nm 到超過1800 nm 的波段。此系統的第一級光源為一功率為14 mW、脈衝寬度為 1.8 ps、重複率為 1 GHz 的脈衝序列。之後，我們用一光纖放大器來提高光功率至 1.2 W並同時將脈衝寬度壓縮至 414 fs。最後，我們將此脈衝序列入射至一段長 0.95 m 的高非線性光纖來產生超連續光譜。這種高重複率等級的超連續光源應能應用在諸如頻譜量測、頻率標準等之許多領域。

We demonstrate a high power short pulse-width light source composed of a 1GHz asynchronous modelocked (ASM) fiber laser, an Er-Yb optical amplifier/pulse compressor, and a section of high nonlinearity fiber (HNLF) to generate supercontinuum lights with the spectrum span from 1120 nm to over 1800 nm. The ASM fiber laser generates 1.8 picosecond pulses with 14 mW average power at 1 GHz repetition rate. After amplification, about 1.2W average power of 414 femtosecond pulses are generated. Finally, we launch the pulse train into a HNLF with the length of 0.95 m to generate the supercontinuum. This kind of high repetition rate supercontinuum light sources will potentially have lots of applications including spectral measurement and frequency metrology.