Short distributed feedback fiber laser with unidirectional output for sensing applications

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（4）
• 页码范围: 44-46
• 页数: 3页
• 语种: 英文
• DOI: 10.3788/COL201311.041407

摘要

A short distributed feedback fiber laser with a nearly unidirectional output is fabricated and tested.The short fiber laser is made of a polarization-dependent phase-shift grating fabricated with a vertically polarized 244-nm ultraviolet (UV) laser.A single π phase-shift is introduced to a 2-cm grating at a specified position by directly moving the phase mask during UV beam scanning.Test results show that the laser has a single polarization longitudinal mode with 2.6-mW pump threshold.The backward-toforward output power ratio is approximately 30:1.The relative intensity noise is-88 dB/Hz,and the linewidth is approximately 10 kHz at 75-mW 980-nm pumping.The unidirectional output and short dimension of this short fiber laser make it very useful in sensing applications,especially in multiplexed sensing applications.