This work reports on possibilities of contrast enhancement of dynamically excited coherent population trapping (CPT) resonance in ⁸⁷Rb vapour arising from application of feedback methods. Controlling the bichromatic pump radiation power through a feedback loop that stabilises Rb atom luminescence when scanning the frequency difference of the bichromatic pump radiation resulted in a more than an order-or-magnitude improvement in the amplitude of the CPT resonance at scanning frequencies over 100 Hz. It is established that the excursion of the pump radiation power controlled by the feedback loop under dynamic excitation is by an order of magnitude smaller than that under quasistationary excitation at scan frequencies < 1 Hz.

Date Published: 3 November 2016
PDF: 6 pages
Proc. SPIE 10029, Quantum and Nonlinear Optics IV, 100291K (3 November 2016); doi: 10.1117/12.2247794

Published in SPIE Proceedings Vol. 10029:
Quantum and Nonlinear Optics IV
Qihuang Gong; Guang-Can Guo; Byoung Seung Ham, Editor(s)