Abstract
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 1 with 10 3 times less laser power, revealing some previously vague and unobserved spectra. © 2011 OSA.