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Bulletin of the American Physical Society

Optical trapping and cooling of $^{87}$Rb with a 1550 nm fiber laser

Abraham J. Olson, Ping Wang, Robert Niffenegger, Qianli Ma, Yong P. Chen

Published Jun 14, 2011• 0 citations
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Optical trapping and cooling of 87^{87}87Rb with a 1550 nm fiber laser
One of the prominent platforms for quantum technologies, cold atoms require reliable laser systems. We present the design, implementation, and characterization of a simple, compact, and economical laser system at 780 nm, entirely based on fiber components. Two semiconductor lasers at 1560 nm are amplified in a single erbium-doped fiber amplifier and frequency-doubled in a periodically-poled lithium niobate crystal. We characterize the amplitude noise and the linewidth of the lasers, as well as the SHG efficiency. With an RMS relative amplitude noise of 3 × 10−4 at 1 s and linewidths below 1 MHz, our system is suitable for cooling and trapping of Rb atoms.
We mainly report the 728.0 nm transition between 7S 1/2 and 5P 1/2 laser spectroscopy of an electrodeless discharge Rb vapor lamp, which is the clock transition of a potential four-level active optical clock, once laser cooled and trapped Rb atoms are pumped by 359.2 nm laser. To realize this proposition, we study the linewidth and absorption characteristics of the 728.0 nm laser absorption spectrum of a rubidium electrodeless discharge vapor lamp with varying lamp temperature and rf driving power respectively, measured by an external cavity diode laser in a Littrow configuration. The measured 728.0 nm spectrum of a glass cell filled with Rb and Ar buffer gases in the electrodeless discharge Rb lamp based Faraday filter stabilized laser can be a heterodyne comparison reference for the weak power output of a possible cold Rb four-level active optical clock at 728.0 nm clock transition with laser cooled and trapped atoms. To the best of our knowledge, there has not been any research reported on Rb 728.0 nm laser spectroscopy in detail.