Coherent Light Amplification in Optically Pumped Cs Vapor

Stephen F. Jacobs, G. Gould, P. Rabinowitz

Received 11 September 1961DOI:https://doi.org/10.1103/PhysRevLett.7.415©1961 American Physical Society

Jongmin Hwang, Taek Jeong, Han Seb Moon

Celestino J. Gaeta, Jenny Lam

Heewoo Kim, Yujae Jeong, Kyeongjun Hwang +2 more

We report high-efficiency optical amplification with near-extreme-limit gain from a diode-pumped Cs vapor cell. We used wavelength-division multiplexing to couple 852 nm pump and 895 nm seed lasers to achieve nearly overlapping spatial modes in the Cs vapor cell. We investigated the amplification factor as a function of the focal length of the lens focusing on the combined pump and seed signals and determined the optimal focal length under our experimental conditions. The small-signal amplification factor from the Cs vapor cell reached >30 dB at 240 mW pump power, and the optimal optical amplification factor per pump power was 4171/W.

Xiaochi Liu, Jean-Marc Mérolla, Stéphane Guérandel +2 more

We report on the detection of high-contrast and narrow Coherent Population Trapping (CPT) Ramsey fringes in a Cs vapor cell using a simple-architecture laser system. The latter allows the combination of push-pull optical pumping (PPOP) and a temporal Ramsey-like pulsed interrogation. An originality of the optics package is the use of a single Mach-Zehnder electro-optic modulator (MZ EOM) both for optical sidebands generation and light switch for pulsed interaction. Typical Ramsey fringes with a linewidth of 166 Hz and a contrast of 33 % are detected in a cm-scale buffer-gas filled Cs vapor cell. This technique could be interesting for the development of high-performance and low power consumption compact vapor cell clocks based on CPT.

Yifu Zhu, Ji Lin, Paul Sanchez