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Solid State Communications

Spectral investigation of spin echo emission

R. Boscaino, F. M. Gelardi

Published Aug 1, 1993• 2 citations
Publisher
DOI
10.1016/0038-1098(93)90790-t

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The ability to control microwave emission from a spin ensemble is a requirement of several quantum memory protocols. Here, we demonstrate such ability by using a resonator whose frequency can be rapidly tuned with a bias current. We store excitations in an ensemble of rare-earth ions and suppress on demand the echo emission ("echo silencing") by two methods: (1) detuning the resonator during the spin rephasing, and (2) subjecting spins to magnetic field gradients generated by the bias current itself. We also show that spin coherence is preserved during silencing.
The nonlinear properties of an undoped GaN epitaxial layer in the spectral region of the yellow band have been investigated using two- and three-pulse two-colour photon echo measurements. The optical nonlinearity induced by three sequential femtosecond pulses is studied on a short timescale (<500 fs) where free induction decay and photon echoes are the main contributions to the observed signal and on a long timescale (up to 20 ps) in the case of a population grating. Variation of the wavelength of the femtosecond pulses and the use of spectrally resolved measurements allows us to study the origin of the yellow band and the phase and energy relaxation properties of this band. The results suggest that the emission of light in the yellow band arises from recombination between shallow donors and deep acceptors and that the trapping time of carriers into defect levels is very short (<1 ps).