Saturated spectroscopy applied to Xenon at 3.5 µm

We report the observation of the xenon isotope spectrum using saturation spectroscopy on a gain cell external to a He-Xe laser. Six resonances centered about 3.508μm are observed over the limited tuning range of the laser. These resonances are assigned to the Xe
¹²⁸
Xe
¹³⁰
Xe
¹³¹
Xe
¹³²
Xe
¹³⁴
and Xe
¹³⁶
isotopes. The observed homogeneous linewidth is 9 ± 1 MHz, and the pressure broadening of the homogeneous linewidth is experimentally determined to be 71 ± 20 MHz/ torr.