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Slow and Fast Light (SL)

Observation of Superluminal in C60 Nonlinear Solution

Yundong Zhang, Hao Wang, Nan Wang, He Tian, Ping Yuan

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We observed the group superluminal in C60 toluene solution by coherent population oscillation with input power of 60 mW from Ar+ laser at 514.5 nm. Maximum advancement was 3.58 ms, inferred a negative group velocity of −8.40m/s.
DOI
10.1364/sl.2006.me5

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International Conference on Optical Communications and Networks (ICOCN)•Jan 1, 2010•1 citation
Superluminal propagation at negative group velocity was demonstrated in a highly nonlinear fiber embedded in a Brillouin laser ring cavity. A maximum advancement of 369 ns and strong Stokes lasing power of 482 mW were achieved when the cavity was pumped with a 1 MHz sinusoidal wave modulated signal at power level of 1 W. The frequency dependence of fast light in this fiber ring cavity was examined with modulation frequencies of 1 kHz to 15 MHz. a maximum fractional advancement of 0.54 was achieved at 10 kHz and a maximum negative group index of - 9480 was demonstrated at 1 kHz.
We report superluminal propagation in optical fibers using Brillouin lasing oscillation in a ring cavity. Negative group velocity propagation through a 10-m single mode fiber has been experimentally demonstrated. An advancement of 221.2 ns was observed before the input signal, which was achieved with a very high slope efficiency of 211.3 ns/dB. This indicates that this way is suitable for long-distance low-loss superluminal propagation via optical fibers. Correspondingly, the group velocity is -0.151c and the group index is -6.636-the highest group velocity ever reported for optical fibers.
Superluminal propagation at negative group velocity was demonstrated in a highly nonlinear fiber embedded in a stimulated Brillouin scattering laser ring cavity. A maximum advancement of 369 ns and strong Stokes lasing power of 482 mW were observed when the cavity was pumped with a 1 MHz sinusoidal wave modulated signal at the power level of 1 W. The frequency dependence of fast light in this fiber ring cavity was examined with modulation frequencies of 1 kHz to 15 MHz, a maximum fractional advancement of 0.54 was achieved at 10 kHz, and a maximum negative group index of −9480 was demonstrated at 1 kHz.
We investigated the light propagation in an organic glass with phthalocyanine gallium (GaPc) dispersed in polymethyl methacrylate (PMMA) fabricated by injection molding. The GaPc/PMMA organic glass is a reverse saturation absorption medium. We observed the superluminal propagation in this organic glass by using the technique of coherent population oscillations at room temperature. The largest time advancement is 2.21 ms and the corresponding group velocity is −0.90 m/s at the wavelength of 532 nm and with the input power of 89 mW. The density matrix theory with four-level model was used to analyze the experimental data. The theoretical simulations showed that the time advancement not only depends on the modulation frequency but also on the lifetime of the first triplet-state of the GaPc. We compared the time advancements between the GaPc/PMMA organic glass and the C60/toluene solution. Although the value of the former is smaller, it is more suitable for practical applications such as optical information processing than the latter.
We demonstrated the superluminal propagation at negative group velocity using stimulated Brillouin scattering (SBS) in optical fibers. In the scheme, the Stokes wave is circulated back into the ring cavity for Brillouin lasing to enhance the peak loss. The experiment demonstrated the superluminal light propagation can be realized by increasing the input signal power. The largest time advancement of 221.2ns has been observed. Correspondingly, the negative group velocity is -0.15c and the group index is -6.636.