Cavity-enhanced superradiant optical ringdown in an optically thin sample

Muyao Ji, 段亚凡 Duan Yafan, 钮月萍 Niu Yueping +1 more

Christoph M. Greiner, B. Boggs, THOMAS W. MOSSBERG

We report observations of optical superradiant emission and the atomic evolution it drives under conditions closely approximating those originally envisioned in the classic work of Dicke [Phys. Rev. 93, 99 (1954)]. Our experiment involves an optically thin solid sample in a short-lifetime optical cavity whose homogeneous coherence is cryogenically stabilized. Pulsed coherent excitation initiates superradiant emission which subsequently drives the sample to higher or lower states of coherence. Suppression of dephasing via cryogenics and propagation effects through use of an optically thin sample and cavity provides one of the clearest and cleanest examples of Dicke superradiance yet reported.

Wenge Yang, Amitabh Joshi, Min Xiao

We show that the unique absorption and dispersion properties of the electromagnetically induced transparency can be used effectively to enhance the cavity ringdown effect. By placing an EIT medium inside an optical resonator, the conditions for observing cavity ringdown oscillations are greatly relaxed.

Simon B. Jäger, Haonan Liu, Athreya Shankar +2 more

Dominic Meiser, Michael J. Martin, Jun Ye +1 more

Hans W. Mertens, Albert Polman, I. M. P. Aarts +2 more

We present measurements of the optical absorption cross section of the I15∕24→I13∕24 transition at 1.5μm of Er3+ ions embedded in SiO2 and Si-rich oxide, using cavity ringdown spectroscopy on thin films. The peak absorption cross section for Er3+ embedded in Si-rich oxide (10at.% excess Si) was found to be (8±2)×10−21cm2 at 1536nm, similar to typical values for Er embedded in SiO2. The data imply that the silicon nanoclusters incorporated in Si-rich oxide do not enhance the peak cross section of the Er3+ I15∕24−I13∕24 transition by 1-2 orders of magnitude, contrary to what has been reported in earlier work.