We have investigated the self-induced transparency effect in ruby over a range of input energies which range from linear absorption to full transparency. The transmission, pulse delay, and pulse broadening were studied as a function of input energy. The transition region is narrower than that found in similar studies of the C ${\mathrm{O}}_{2}$ /S ${\mathrm{F}}_{6}$ system; this is consistent with predictions based on ensembles of two-level systems. Included are the first pulse-delay and pulse-broadening curves to be obtained for the ruby system.We have investigated the self-induced transparency effect in ruby over a range of input energies which range from linear absorption to full transparency. The transmission, pulse delay, and pulse broadening were studied as a function of input energy. The transition region is narrower than that found in similar studies of the C${\mathrm{O}}_{2}$/S${\mathrm{F}}_{6}$ system; this is consistent with predictions based on ensembles of two-level systems. Included are the first pulse-delay and pulse-broadening curves to be obtained for the ruby system.

Physical Review AJan 1, 197214 citations

Temperature-Dependent Phase Memory of Ruby Determined by Self-Induced Transparency

Irvin M. Asher, F. A. Hopf, L. K. Kie

A computer simulation of recent self-induced-transparency experiments in ruby demonstrates the general appropriateness of a previously derived two-level model for a wide range of attenuator temperatures. The only significant deviation is a sharper rise in the experimental delay curve. The temperature dependence of the homogeneous phase relaxation ${T}_{2}^{\ensuremath{'}}$ was introduced by including a "direct" phonon transition process in our program. The parameters for best fit provide ${{T}^{\ensuremath{'}}}_{2}\ensuremath{\simeq}50$ nsec for $T\ensuremath{\simeq}0$ \ifmmode^\circ\else\textdegree\fi{}K, which emphasizes the importance of phase-memory effects in low-temperature atomic-coherence experiments in ruby.A computer simulation of recent self-induced-transparency experiments in ruby demonstrates the general appropriateness of a previously derived two-level model for a wide range of attenuator temperatures. The only significant deviation is a sharper rise in the experimental delay curve. The temperature dependence of the homogeneous phase relaxation ${T}_{2}^{\ensuremath{'}}$ was introduced by including a "direct" phonon transition process in our program. The parameters for best fit provide ${{T}^{\ensuremath{'}}}_{2}\ensuremath{\simeq}50$ nsec for $T\ensuremath{\simeq}0$ \ifmmode^\circ\else\textdegree\fi{}K, which emphasizes the importance of phase-memory effects in low-temperature atomic-coherence experiments in ruby.

Physical Review AJul 1, 19732 citations

Ultra-slow light propagation by self-induced transparency in ruby in the superhyperfine limit

Hans Riesen, Aleksander K. Rebane, Rajitha Papukutty Rajan +3 more

Self-induced transparency is reported for circularly polarized light in the R1(−3/2) line of a 30 ppm ruby (α-Al2O3:Cr3+) at 1.7 K in a magnetic field of B‖c=4.5 T. In such a field and temperature, a 30 ppm ruby is in the so-called superhyperfine limit resulting in a long phase memory time, TM=50 μs, and a thousand-fold slower pulse propagation velocity of ∼300 m/s was observed, compared to the ∼300 km/s measured in the first observation of self-induced transparency (SIT) ∼50 years ago, that employed a ruby with a 500 ppm chromium concentration in zero field and at 4.2 K. To date, this is the slowest pulse propagation ever observed in a SIT experiment.Self-induced transparency is reported for circularly polarized light in the R1(−3/2) line of a 30 ppm ruby (α-Al2O3:Cr3+) at 1.7 K in a magnetic field of B‖c=4.5 T. In such a field and temperature, a 30 ppm ruby is in the so-called superhyperfine limit resulting in a long phase memory time, TM=50 μs, and a thousand-fold slower pulse propagation velocity of ∼300 m/s was observed, compared to the ∼300 km/s measured in the first observation of self-induced transparency (SIT) ∼50 years ago, that employed a ruby with a 500 ppm chromium concentration in zero field and at 4.2 K. To date, this is the slowest pulse propagation ever observed in a SIT experiment.

Optics LettersApr 28, 20175 citations

{\mathrm{O}}_{2}

{\mathrm{F}}_{6}

system; this is consistent with predictions based on ensembles of two-level systems. Included are the first pulse-delay and pulse-broadening curves to be obtained for the ruby system.