We have demonstrated sub-shot-noise FM spectroscopy on thermal cesium atoms, using amplitude-squeezed light from a semiconductor laser. The light source used in our experiment was a custom-made GaAs transverse junction stripe semiconductor laser featuring broadband amplitude squeezing and a large FM bandwidth. We have also developed a new technique by which a semiconductor laser can be frequency modulated with infinitesimally small residual AM and with complete preservation of the squeezed-amplitude fluctuations.
© 2000 Optical Society of America
Steven Kasapi, Seema Lathi, and Yoshihisa Yamamoto, "Sub-shot-noise frequency-modulation spectroscopy by use of amplitude-squeezed light from semiconductor lasers," J. Opt. Soc. Am. B 17, 275-279 (2000)