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Temperature dependence of self-induced transparency in ruby

Irvin M. Asher, Marlan O. Scully

Optics CommunicationsAug 1, 197113 citations

Effect of self-induced transparency in ruby at 105°K

Aleksandr M Leontovich, A. M. Mozharovskiǐ

ZhETF Pisma RedaktsiiuMar 1, 19740 citations

Self-transparency in ruby with allowance for level degeneracy

V P Kirsanov

Journal of Russian Laser ResearchJan 1, 19830 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

Phase-modulation propagation effects in ruby

Jean‐Claude Diels, Erwin Louis Hahn

Two types of nonlinear transmission of light pulses associated with phase modulation are observed in experiments connected with self-induced transparency (SIT) in ruby. Anomalous pulse-power transmission is observed to be an order of magnitude greater than linear transmission during the condition of zero-area pulse propagation, where the inhomogeneous line spectral width is greater than the applied pulse spectral width. For application of a pulse off-resonance by the order of a linewidth, nonlinear transmission occurs in which a type of "precursor" phase-modulated signal appears ahead of a developing SIT pulse. The precursor pulse velocity is greater than the SIT pulse velocity, but less than the background velocity of light in the medium.Two types of nonlinear transmission of light pulses associated with phase modulation are observed in experiments connected with self-induced transparency (SIT) in ruby. Anomalous pulse-power transmission is observed to be an order of magnitude greater than linear transmission during the condition of zero-area pulse propagation, where the inhomogeneous line spectral width is greater than the applied pulse spectral width. For application of a pulse off-resonance by the order of a linewidth, nonlinear transmission occurs in which a type of "precursor" phase-modulated signal appears ahead of a developing SIT pulse. The precursor pulse velocity is greater than the SIT pulse velocity, but less than the background velocity of light in the medium.

Physical Review ADec 1, 197430 citations

Phase relaxation and self-induced transparency in ruby

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