论文标题
使用频率梳子探针对甲烷进行亚次数双共和度光谱
Sub-Doppler Double-Resonance Spectroscopy of Methane Using a Frequency Comb Probe
论文作者
论文摘要
We report the measurement of sub-Doppler double-resonance transitions in methane using a 3.3 $μ$m continuous wave optical parametric oscillator to pump transitions in the fundamental $ν_3$ band and a 1.67 $μ$m frequency comb to probe ladder-type transitions in the 3$ν_3$ band over 200 cm$^{-1}$ of bandwidth.我们检测到9个泵送过渡的36个梯子式共振，平均中心频率精度为1.7 MHz，受泵频率稳定性的限制。使用理论线列表分配了线，以及不同相对泵/探针极化的强度比。该方法提供了无法使用高温光谱完成的高度激发能级的准确分配。
We report the measurement of sub-Doppler double-resonance transitions in methane using a 3.3 $μ$m continuous wave optical parametric oscillator to pump transitions in the fundamental $ν_3$ band and a 1.67 $μ$m frequency comb to probe ladder-type transitions in the 3$ν_3$ band over 200 cm$^{-1}$ of bandwidth. We detected 36 ladder-type resonances for 9 pumped transitions with average center frequency accuracy of 1.7 MHz, limited by the pump frequency stability. The lines are assigned using the TheoReTS line list, and the intensity ratios for different relative pump/probe polarizations. This method provides accurate assignment of highly excited energy levels that cannot be done using high temperature spectra.
