论文标题
一氧化二氮（n $ _2 $ o）的无多普勒两光子腔向下光谱
Doppler-Free Two-Photon Cavity Ring-Down Spectroscopy of a Nitrous Oxide (N$_2$O) Vibrational Overtone Transition
论文作者
论文摘要
我们报告了n $ _2 $ o的无多普勒两光子的吸收，$λ$ = 4.53 $μ$ m，以腔戒指的光谱法测量。通过将量子级联激光器的光学自锁定到线性谐振器$ f $ = 22730的光学自我锁定，并且相对于光学频率梳子，测量了在400 MHz范围内的精确激光。在p = 0.13 kPa的样本压力下，我们报告了$σ_{13}^{（2）} $ = 8.0 $ = 8.0 $ \ times $ 10 $^{ - 41} $ cm $^4 $ s molecule $^{ - 1} $的$ q $（18）$ q $（18）$ q $（18）$ q $（18）$ q $（18）$ q $ nsontration $ = 66179400.8 MHz。
We report Doppler-free two-photon absorption of N$_2$O at $λ$ = 4.53 $μ$m, measured by cavity ring-down spectroscopy. High power was achieved by optical self-locking of a quantum cascade laser to a linear resonator of finesse $F$ = 22730, and accurate laser detuning over a 400 MHz range was measured relative to an optical frequency comb. At a sample pressure of p = 0.13 kPa, we report a large two-photon cross-section of $σ_{13}^{(2)}$ = 8.0 $\times$ 10$^{-41}$ cm$^4$ s molecule$^{-1}$ for the $Q$(18) rovibrational transition at a resonant frequency of $ν_0$ = 66179400.8 MHz.
