基于时间拉伸脉冲频率下转换的50 MScans/s光纤中红外频率扫频激光器
Fiber-based mid-infrared frequency-swept laser at 50 MScans/s via frequency down-conversion of time-stretched pulses
AI总结：
本文提出一种基于光纤的频率扫频中红外光源，利用紧凑锁模光纤激光器和电信光纤对时间拉伸近红外脉冲进行频率下转换，实现了50 MSpectra/s的甲烷气体光谱测量，为高速现场应用提供了紧凑鲁棒的方案。
摘要：
提高中红外（MIR）频率扫频光源的扫频速率为各种基于高速光谱学的应用提供了巨大潜力。虽然连续波频率扫频激光器已实现高达1 MHz的扫频速率，但近期展示的时间拉伸超短脉冲激光器达到了显著更高的扫频速率，高达数十MHz。然而，此前的系统依赖于笨重的飞秒光学参量振荡器，并且由于使用自由空间时间拉伸器，仅产生约30个离散光谱元素。在这项工作中，我们提出了一种基于光纤的频率扫频MIR光源，它利用时间拉伸近红外脉冲的频率下转换，采用紧凑的锁模光纤激光器和电信光纤。作为概念验证演示，我们以50 MSpectra/s的速率对3.4 um附近的甲烷气体进行了MIR光谱学测量，在19.0 cm-1的范围内捕获了220个光谱元素。这种紧凑且鲁棒的高速MIR频率扫频激光器系统具有部署于现场应用的潜力。
英文摘要：
Increasing the sweep rate of mid-infrared (MIR) frequency-swept sources offers significant potential for various high-speed spectroscopy-based applications. While continuous-wave frequency-swept lasers have achieved sweep rates up to 1 MHz, a recently demonstrated time-stretched ultrashort pulsed laser has reached a significantly higher sweep rate, up to tens of MHz. However, the previous system relied on a bulky femtosecond optical parametric oscillator and produced only ~30 discrete spectral elements due to the use of a free-space time stretcher. In this work, we present a fiber-based frequency-swept MIR source that utilizes the frequency down-conversion of time-stretched near-infrared pulses, employing a compact mode-locked fiber laser and telecommunication fiber. As a proof-of-concept demonstration, we performed MIR spectroscopy of methane gas around 3.4 um at a rate of 50 MSpectra/s, capturing 220 spectral elements over a range of 19.0 cm-1. This compact and robust high-speed MIR frequency-swept laser system holds the potential for deployment in field applications.
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