基于双向锁模光纤激光器的自触发异步光学采样太赫兹光谱技术

Self-triggered Asynchronous Optical Sampling Terahertz Spectroscopy using a Bidirectional Mode-locked Fiber Laser.

作者信息

Baker R Dawson, Yardimci N Tolga, Ou Yi-Hsin, Kieu Khanh, Jarrahi Mona

机构信息

University of Arizona, College of Optical Sciences, Tucson, 85721-0094, USA.

University of California Los Angeles, Electrical Engineering Department, Los Angeles, 90095, USA.

出版信息

Sci Rep. 2018 Oct 4;8(1):14802. doi: 10.1038/s41598-018-33152-0.

DOI:10.1038/s41598-018-33152-0

PMID:30287857

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6172287/

Abstract

We report a self-triggered asynchronous optical sampling terahertz spectroscopy system based on a single bidirectional mode-locked fiber laser and plasmonics-enhanced photoconductive nanoantennas. The fiber laser generates two optical mutually coherent pulse trains with a stable repetition rate difference, enabling time-domain terahertz spectroscopy without using any mechanical delay line, stabilization electronics, or external trigger. The resolved terahertz spectra over a 0.1-2 THz frequency range and a 30-second measurement time show more than a 70-dB dynamic range, revealing water absorption lines matching the HITRAN database, through a light-weight and compact spectroscopy setup.

摘要

我们报道了一种基于单双向锁模光纤激光器和等离子体增强光电导纳米天线的自触发异步光学采样太赫兹光谱系统。该光纤激光器产生两个具有稳定重复率差的光学相互相干脉冲序列，无需使用任何机械延迟线、稳定电子设备或外部触发即可实现时域太赫兹光谱。通过一个轻便紧凑的光谱装置，在0.1 - 2太赫兹频率范围内和30秒测量时间内解析出的太赫兹光谱显示出超过70分贝的动态范围，揭示了与HITRAN数据库匹配的水吸收线。