Time-resolved spectroscopic temperature measurements of a sealed carbon dioxide sample cell were realized with an optical frequency comb combined with a two-dimensional dispersive spectrometer. A supercontinuum laser source based on an erbium fiber mode-locked laser was employed to generate coherent light around 2000 nm (5000 cm-1). The laser was passed through a 12-cm long cell containing CO2, and the transmitted light was analyzed in a virtually imaged phased array- (VIPA-) based spectrometer. Broadband spectra spanning more than 100 cm-1 with a spectral resolution of roughly 0.075 cm-1 (2.2 GHz) were acquired with an integration period of 2 ms. The temperature of the CO2 sample was deduced from fitting a modeled spectrum to the line intensities of the experimentally acquired spectrum. Temperature dynamics on the time scale of milliseconds were observed with a temperature resolution of 2.6 K. The spectroscopically-deduced temperatures agreed with temperatures of the sample cell measured with a thermistor. Potential applications of this technique include quantitative measurement of carbon dioxide concentration and temperature dynamics in gas-phase chemical reactions (e.g., combustion), and plasma diagnostics.
Multi-species breath biomarker profiling with an ultra-broadband (2.9-11.5 μm) spectroscopic platform
Trace Detection Laboratory, Department of Spectroscopy and Catalysis, Institute for Molecules and Materials, Radboud University（鲁汶大学分子与材料研究所光谱与催化系痕量检测实验室）；Faculty of Science and Engineering, Maastricht University（马斯特里赫特大学科学与工程学部）
An air-spaced virtually imaged phased array with 94 MHz resolution for precision spectroscopy
Leibniz Institute for Plasma Science and Technology (INP)（莱布尼兹等离子体科学与技术研究所）；Experimental Physics V – Spectroscopy of Atoms and Molecules by Laser Methods, Faculty of Physics and Astronomy, Ruhr University Bochum（波鸿鲁尔大学物理与天文学学院实验物理学V系（激光方法原子和分子光谱学））
Overcoming sensitivity-bandwidth trade-off in mid-infrared spectroscopy by a microresonator-anchored swept laser
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University（清华大学精密仪器系精密测量技术与仪器国家重点实验室）；College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences（中国科学院大学材料科学与光电技术学院）；Research and Development Center for Wide Bandgap Semiconductors, Institute of Semiconductors, Chinese Academy of Sciences（中国科学院半导体研究所宽禁带半导体研发中心）；CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China（中国科学技术大学地球与空间科学学院空间环境中国科学院重点实验室）；Hefei National Laboratory, University of Science and Technology of China（中国科学技术大学合肥国家实验室）；Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences, University of Science and Technology of China（中国科学技术大学物理科学学院微尺度物质科学国家研究中心）；CAS Center for Excellence in Comparative Planetology, Anhui Mengcheng Geophysics National Observation and Research Station, University of Science and Technology of China（中国科学技术大学安徽蒙城地磁国家野外科学观测研究站比较行星学中国科学院卓越创新中心）
Breath analysis by ultra-sensitive broadband laser spectroscopy detects SARS-CoV-2 infection
JILA（JILA研究所）；National Institute of Standards and Technology（美国国家标准与技术研究院）；University of Colorado（科罗拉多大学）；University of Basel（巴塞尔大学）；BioFrontiers Institute（生物前沿研究所）；University of Colorado Anschutz Medical Campus（科罗拉多大学安舒茨医学校区）
