Continuum laser absorption spectroscopy of C2(a3Πu) in a sublimating cloud of carbon black

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-07-29 DOI:10.1007/s00340-025-08523-x

Colton Willhardt, Neil Thakker, Nick Son, Adam Hammond-Clements, Kyle Daniel, Nick Glumac

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Abstract

A direct optical absorption diagnostic has been developed for rotationally resolved measurements of diatomic carbon (a³Π_u→d³Π_g (0,0) and (1,1)) at a repetition rate of 525 kHz and resolution of 7.3 pm over the range of 511.1–514.1 nm. The diagnostic utilizes a high-power pulsed continuum laser light source dispersed in a spectrograph and imaged by a high-speed camera. Measurements have been performed that capture the temporal evolution of C₂ number density and temperature of a cloud of carbon black sublimating in shock heated gas at high temperature and pressure (T = 5500 K, P = 3.7 atm). A simultaneous light absorption measurement of the condensed phase enables comparisons of the gaseous C₂ number density to the condensed phase mass. The continuum laser absorption diagnostic is applied to C₂ in this work but shows promise in being a simple “drop-in” system for absorption spectroscopy in the visible range at rapid repetition rates and high dispersion, filling an important gap for laser diagnostic systems.

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C2（a3Πu）在炭黑升华云中的连续激光吸收光谱

在511.1-514.1 nm范围内，以525 kHz的重复率和7.3 pm的分辨率，开发了用于双原子碳（a3Πu→d3Πg（0,0）和（1,1））旋转分辨测量的直接光学吸收诊断方法。该诊断方法利用分散在摄谱仪中的高功率脉冲连续激光光源，并由高速摄像机成像。在高温高压下（T = 5500 K, P = 3.7 atm），炭黑云在激波加热气体中升华时，C2数密度和温度随时间的变化进行了测量。冷凝相的同时光吸收测量可以比较气体C2数密度和冷凝相质量。连续激光吸收诊断在本工作中应用于C2，但显示出作为一个简单的“插入式”系统，在可见范围内具有快速重复率和高色散的吸收光谱，填补了激光诊断系统的重要空白。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.