Storage and time reversal of light pulses using photon echoes

Abstract

We have studied the temporal profile of photon-echo signals generated by combined gated cw and pulsed dye-laser excitation of the inhomogeneously broadened, 555.6-nm absorption line of (174)Yb vapor. We find that the echo profile is, after time reversal, essentially identical with that of the first excitation pulse. We give a new analysis of this effect. Since time-reversed pulse reproduction should also occur in inhomogeneously broadened solid samples, and since we observe time-reversed reproduced pulses up to 4% as intense as the input pulse, this effect may have important applications in optical signal-processing systems.

Demonstration of a continuous scanner and time-integrating correlator using spatial–spectral holography

“…Even though this triple-product linear filter approximation is only valid in the small signal regime, it still provides valuable insight even when the signals start approaching the large-signal regime [1,11,12]. Choosing s 1 ðtÞ as a correlation reference, s 2 ðtÞ as a brief pulse, and reading out with an unknown waveform s 3 ðtÞ produces a correlation oðtÞ ¼ s 1 ðtÞ%s 3 ðtÞ; while other configurations have been used for data storage and retrieval [13][14][15][16], phase conjugation [17], time-reversal [18], convolution [1], and true-time-delay [19][20][21]. Most of these previous approaches relied purely on the timedomain processing capabilities of photon echoes, and used neither the available space domain parallelism, nor spatial Fourier optical processing, nor Bragg angle multiplexed volume holography techniques in conjunction with the temporal photon echoes.…”

Synchronization of qubit ensembles under optimizedπ-pulse driving

“…The storage and retrieval protocols were proposed in Refs. [25][26][27] and based on spin-refocusing techniques [28,29] or successive magnetic field gradients. In the context of quantum memory the unavoidable spectral broadening in qubit excitation frequencies provides multimode performance from one side, but from the other side this is one of limiting factors affecting coherence times.…”

Naphthalocyanine-based time reversal mirror at

“…In 1983, Carlson et al [4] performed the first demonstration of time reversal of photon echoes on the inhomogeneously broadened 555:6 nm absorption line of 174 Yb vapour. The same year, Rebane et al [5] performed photon echo and time reversal experiments using a picosecond laser source on porphyrazine styrol solid solutions at 630 nm: Later, the conjugation of temporal profiles of pulses as short as 100 fs performed in a PSHB material was reported [6].…”