High-resolution 133Cs 6S-6D, 6S-8S two-photon spectroscopy using an intra-cavity scheme

We demonstrate an intra-cavity scheme for diode laser based on two-photon spectroscopy. Three
¹³³
Cs hyperfine transition groups of different wavelengths are shown. For the 6S-6D transitions, we achieved 10
²
times better signal-to-noise ratio than previous work with 10
^-3
times less laser power, revealing some previously vague and unobserved spectra.