We present what is to our knowledge the first measurement of a two-photon transition excited in Rb with a commercial diode laser. In addition to the limitation imposed by diode lasers’ characteristic low powers, their relatively large bandwidths and sensitivity to optical feedback effects impede their application to two-photon spectroscopy. However, we show that optimized signal detection and careful minimization of optical feedback with an acousto-optic modulator combined with a Faraday isolator result in good two-photon signals with an off-the-shelf diode laser.
© 1993 Optical Society of America
R. E. Ryan, L. A. Westling, and H. J. Metcalf, "Two-photon spectroscopy in rubidium with a diode laser," J. Opt. Soc. Am. B 10, 1643-1648 (1993)