The vast majority of gaseous chemical substances exhibit fundamental rovibrational
absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light …

In this work, control over the precise state emitted by quantum cascade laser frequency
combs through strong radio‐frequency current modulation close to their repetition frequency …

Heterogeneously integrating III-V materials on silicon photonic integrated circuits has
emerged as a promising approach to make advanced laser sources for optical …

In this paper we report a mid-infrared sensor based on an anti-resonant hollow core fiber. A
quantum cascade laser operating around 4.53 µm is used to target one of the strongest …

摘要提出了一种基于光声光谱技术的气体传感器, 以444nm 蓝光激光器为激发光源,
实现了对大气, 汽车尾气中NO2 的检测及光解分析. 对压强, NO2 体积分数与共振频率的关系 …

Chemiresistive‐type gas sensors, which are driven by the thermal activation, have exhibited
extraordinary promise for the detection of air pollutions, such as highly toxic gas of nitrogen …

Instrumentation for environmental monitoring of gaseous pollutants and greenhouse gases
tends to be complex, expensive, and energy demanding, because every compound …

A switchable, thulium-doped, isolator-free fiber laser is proposed and demonstrated. The
isolator-free configuration, wavelength selective element and stabilization mechanism were …

Nitric oxide (NO) and nitrogen dioxide (NO 2) are relevant to air quality due to their role in
tropospheric ozone (O 3) production. In China, NO x emission is high and exhausted from on …

This paper presents a detailed experimental wavelength modulation spectroscopy approach
and demonstrates its applicability to various types of semiconductor lasers in the near …