Slow light in saturable absorbers : Progress ...
Document type :
Compte-rendu et recension critique d'ouvrage
Title :
Slow light in saturable absorbers : Progress in the resolution of a controversy
Author(s) :
Macke, Bruno [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Razdobreev, Igor [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Segard, Bernard [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]

Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Razdobreev, Igor [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Segard, Bernard [Auteur]

Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Journal title :
Physical Review A : Atomic, molecular, and optical physics [1990-2015]
Pages :
063830
Publisher :
American Physical Society
Publication date :
2017-06-20
ISSN :
1050-2947
English keyword(s) :
Slow light propagation
Saturable absorber
Saturable absorber
HAL domain(s) :
Physique [physics]/Physique [physics]/Optique [physics.optics]
English abstract : [en]
There are two opposing models in the analysis of the slow transmission of light pulses through saturable absorbers. The canonical incoherent bleaching model simply explains the slow transmission by combined effects of ...
Show more >There are two opposing models in the analysis of the slow transmission of light pulses through saturable absorbers. The canonical incoherent bleaching model simply explains the slow transmission by combined effects of saturation and of non-instantaneous response of the medium resulting in absorption of the front part of the incident pulse larger than that of its rear. The second model, referred to as the coherent-population-oscillations (CPO) model, considers light beams whose intensity is slightly pulse modulated and attributes the time delay of the transmitted pulse to a reduction of the group velocity. We point out some inconsistencies in the CPO model and show that the two models lie in reality on the same hypotheses, the equations derived in the duly rectified CPO model being local expressions of the integral equations obtained in the incoherent bleaching model. For large modulation index, the CPO model, based on linearized equations, breaks down. The incoherent bleaching model then predicts that the transmitted light should vanish when the intensity of the incident light is strictly zero. This point is confirmed by the experiments that we have performed on ruby with square-wave incident pulses and we show that the whole shape of the observed pulses agrees with that derived analytically by means of the incoherent bleaching model. We also determine in this model the corresponding evolution of the fluorescence light, which seems to have been evidenced in other experiments.Show less >
Show more >There are two opposing models in the analysis of the slow transmission of light pulses through saturable absorbers. The canonical incoherent bleaching model simply explains the slow transmission by combined effects of saturation and of non-instantaneous response of the medium resulting in absorption of the front part of the incident pulse larger than that of its rear. The second model, referred to as the coherent-population-oscillations (CPO) model, considers light beams whose intensity is slightly pulse modulated and attributes the time delay of the transmitted pulse to a reduction of the group velocity. We point out some inconsistencies in the CPO model and show that the two models lie in reality on the same hypotheses, the equations derived in the duly rectified CPO model being local expressions of the integral equations obtained in the incoherent bleaching model. For large modulation index, the CPO model, based on linearized equations, breaks down. The incoherent bleaching model then predicts that the transmitted light should vanish when the intensity of the incident light is strictly zero. This point is confirmed by the experiments that we have performed on ruby with square-wave incident pulses and we show that the whole shape of the observed pulses agrees with that derived analytically by means of the incoherent bleaching model. We also determine in this model the corresponding evolution of the fluorescence light, which seems to have been evidenced in other experiments.Show less >
Language :
Anglais
Popular science :
Non
Source :
Files
- https://hal.archives-ouvertes.fr/hal-01504592v2/document
- Open access
- Access the document
- http://arxiv.org/pdf/1704.02820
- Open access
- Access the document
- https://hal.archives-ouvertes.fr/hal-01504592v2/document
- Open access
- Access the document
- https://hal.archives-ouvertes.fr/hal-01504592v2/document
- Open access
- Access the document
- https://hal.archives-ouvertes.fr/hal-01504592v2/document
- Open access
- Access the document
- document
- Open access
- Access the document
- BleachingVF.pdf
- Open access
- Access the document
- 1704.02820
- Open access
- Access the document