论文标题
$ v_1+v_3 $ c $ _2 $ _2 $ h $ _2 $中的子多普勒过渡的频率测量和自大
Frequency measurements and self-broadening of sub-Doppler transitions in the $v_1+v_3$ band of C$_2$H$_2$
论文作者
论文摘要
报道了$ v_1+v_3 $ actyrme的带子激光饱和吸收线的频率梳子引用的测量值接近$ 1.5 \，μ\ mathrm {m} $。这些测量值包括涉及比以前在该频段中测量的频率更高的旋转水平的过渡。测得的频率的准确性通常优于10 kHz。观察到的子多普勒线宽度随压力的函数的测量表明，自我压力系数的系数比不饱和多普勒限制光谱的常规压力扩展而得出的系数大约3.5倍。这归因于速度变化的碰撞对低压子多个配置器测量中的总开发率的贡献。在较高的压力下，当均匀扩展与每次弹性碰撞的典型多普勒偏移相当时，速度变化的碰撞就会停止显着促进增量压力扩大。开发了一个时间依赖性的软碰撞模型，以说明子多普勒压力范围的低压和高压状态之间的过渡。
Frequency comb-referenced measurements of sub-Doppler laser saturation dip absorption lines in the $v_1+v_3$ band of acetylene near $1.5\,μ\mathrm{m}$ are reported. These measurements include transitions involving higher rotational levels than previously frequency measured in this band. The accuracy of the measured frequencies is typically better than 10 kHz. Measurements of the observed sub-Doppler line widths as a function of pressure showed that the self pressure-broadening coefficients are about 3.5 times larger than those derived from conventional pressure broadening of unsaturated Doppler-limited spectra. This is attributed to the contribution of velocity-changing collisions to the total dephasing rate in the low pressure sub-Doppler measurements. At higher pressures, when the homogeneous broadening becomes comparable to the typical Doppler shift per elastic collision, the velocity changing collisions cease to contribute significantly to the incremental pressure broadening. A time-dependent soft collision model is developed to illustrate the transition between low and high pressure regimes of sub-Doppler pressure-broadening.
