Rock Nicholas, Hsu Paul S, Lauriola Daniel, Rahman Naveed, Estevadeordal Jordi, Grib Stephen W, Jiang Naibo, Kearney Sean P, Wrzesinski Paul
Appl Opt. 2020 Mar 10;59(8):2649-2655. doi: 10.1364/AO.386378.
Width-increased dual-pump enhanced coherent anti-Stokes Raman spectroscopy (WIDECARS) measurements were used to determine the temperature and major species mole fractions in laminar, premixed, ethylene-air flames operating at atmospheric pressure. Conventional ultrabroadband dye lasers for WIDECARS, which use Pyrromethene dyes, have historically suffered from day-to-day wavelength shifting. To overcome this problem, a new ultrabroadband dye laser was developed in this study to provide a stable wavelength and power generation. A new dye laser pumping scheme and a mixture of Sulforhodamine 640, Kiton Red 620, and Rhodamine 640, was used to generate the desired FWHM ${\sim}{15};{\rm nm}$∼15nm (${410};{{\rm cm}^{ - 1}}$410cm) bandwidth. The WIDECARS measured mole fraction ratios of ${{\rm CO}_2}$CO, CO, and ${{\rm H}_2}$H with ${{\rm N}_2}$N agreed well with chemical equilibrium calculations.
采用增宽双泵浦增强相干反斯托克斯拉曼光谱（WIDECARS）测量技术来测定常压下运行的层流、预混乙烯 - 空气火焰中的温度和主要组分摩尔分数。用于WIDECARS的传统超宽带染料激光器使用吡咯甲川染料，历来存在每日波长漂移的问题。为克服这一问题，本研究开发了一种新型超宽带染料激光器，以提供稳定的波长和功率输出。采用一种新的染料激光泵浦方案以及磺基罗丹明640、奇通红620和罗丹明640的混合物，来产生所需的半高宽约15 nm（410 cm⁻¹）带宽。WIDECARS测量得到的CO₂、CO和H₂与N₂的摩尔分数比与化学平衡计算结果吻合良好。
