Mads Sørensen - Academia.edu (original) (raw)
Uploads
Papers by Mads Sørensen
1999 IEEE LEOS Annual Meeting Conference Proceedings. LEOS'99. 12th Annual Meeting. IEEE Lasers and Electro-Optics Society 1999 Annual Meeting (Cat. No.99CH37009), 1999
It is well known that a semiconductor laser exposed to moderate optical feedback and biased near ... more It is well known that a semiconductor laser exposed to moderate optical feedback and biased near threshold exhibits the phenomenon of low-frequency intensity fluctuations (LFF). While this behavior can be numerically simulated using the so-called Lang-Kobayshi model, the interpretation of the phenomenon has remained a controversy. The LFF consist of a sudden drop in intensity followed by a build-up in steps of the external cavity roundtrip time, τ, before a new drop-out occurs. The phenomenon has been attributed to a kind of chaotic itinerancy and a bifurcation cascade has been identified very recently. These results give insight into the behavior observed on a short time-scale, but do not explain some of the pronounced features of the LFF seen for moderate feedback levels; namely the stepwise build-up and its characteristic time of about 15 steps close to the solitary laser threshold. We present new results related to the slow time-scale behaviour of LFF which give a simple explanation of these general characteristics, as well as providing a new tool for studying the statistics of the LFF
... Ko'hna dastgoh aylanar hamon Bor olam g'ayb sirini ochib. Xaqiqat shu: hech... more ... Ko'hna dastgoh aylanar hamon Bor olam g'ayb sirini ochib. Xaqiqat shu: hech kim, hech qachon Qutilolmas taqdirdan qochib! Charx quyoshi kezadi jahon Gunoh, savob-ikki dunyodir. ... When God favours one man's soul He opens to him all ways. Mustakim R. Djumaev Page 22. ...
Proceedings of SPIE - The International Society for Optical Engineering
ABSTRACT
The role of charge-charge interactions in shape transformations of closed filaments induced by th... more The role of charge-charge interactions in shape transformations of closed filaments induced by the charge-curvature coupling is studied. It is shown that while sufficiently strong repulsive interaction between carriers makes a circular shape of the filament energetically more favorable with a spatially uniform charge distribution along the filament, the attractive interaction facilitates a creation of polygonal filaments. The robustness of the shape transformation process with respect to external forces which are time and space periodic, is considered. It is shown that strong enough external driving makes the shape of the filament and the charge distribution along the filament highly irregular.
Lecture Notes in Physics, 2000
Page 1. Lecture Notes in Physics PLChristiansen MPSarensen AC Scott (Eds.) Nonlinear Science at t... more Page 1. Lecture Notes in Physics PLChristiansen MPSarensen AC Scott (Eds.) Nonlinear Science at the Dawn of the 21st Century (~ Springer Page 2. Lecture Notes in Physics Editorial Board R. Beig, Wien, Austria J. Ehlers, Potsdam ...
New Journal of Physics, 2009
Physical review. B, Condensed matter, 1988
1999 IEEE LEOS Annual Meeting Conference Proceedings. LEOS'99. 12th Annual Meeting. IEEE Lasers and Electro-Optics Society 1999 Annual Meeting (Cat. No.99CH37009), 1999
It is well known that a semiconductor laser exposed to moderate optical feedback and biased near ... more It is well known that a semiconductor laser exposed to moderate optical feedback and biased near threshold exhibits the phenomenon of low-frequency intensity fluctuations (LFF). While this behavior can be numerically simulated using the so-called Lang-Kobayshi model, the interpretation of the phenomenon has remained a controversy. The LFF consist of a sudden drop in intensity followed by a build-up in steps of the external cavity roundtrip time, τ, before a new drop-out occurs. The phenomenon has been attributed to a kind of chaotic itinerancy and a bifurcation cascade has been identified very recently. These results give insight into the behavior observed on a short time-scale, but do not explain some of the pronounced features of the LFF seen for moderate feedback levels; namely the stepwise build-up and its characteristic time of about 15 steps close to the solitary laser threshold. We present new results related to the slow time-scale behaviour of LFF which give a simple explanation of these general characteristics, as well as providing a new tool for studying the statistics of the LFF
... Ko'hna dastgoh aylanar hamon Bor olam g'ayb sirini ochib. Xaqiqat shu: hech... more ... Ko'hna dastgoh aylanar hamon Bor olam g'ayb sirini ochib. Xaqiqat shu: hech kim, hech qachon Qutilolmas taqdirdan qochib! Charx quyoshi kezadi jahon Gunoh, savob-ikki dunyodir. ... When God favours one man's soul He opens to him all ways. Mustakim R. Djumaev Page 22. ...
Proceedings of SPIE - The International Society for Optical Engineering
ABSTRACT
The role of charge-charge interactions in shape transformations of closed filaments induced by th... more The role of charge-charge interactions in shape transformations of closed filaments induced by the charge-curvature coupling is studied. It is shown that while sufficiently strong repulsive interaction between carriers makes a circular shape of the filament energetically more favorable with a spatially uniform charge distribution along the filament, the attractive interaction facilitates a creation of polygonal filaments. The robustness of the shape transformation process with respect to external forces which are time and space periodic, is considered. It is shown that strong enough external driving makes the shape of the filament and the charge distribution along the filament highly irregular.
Lecture Notes in Physics, 2000
Page 1. Lecture Notes in Physics PLChristiansen MPSarensen AC Scott (Eds.) Nonlinear Science at t... more Page 1. Lecture Notes in Physics PLChristiansen MPSarensen AC Scott (Eds.) Nonlinear Science at the Dawn of the 21st Century (~ Springer Page 2. Lecture Notes in Physics Editorial Board R. Beig, Wien, Austria J. Ehlers, Potsdam ...
New Journal of Physics, 2009
Physical review. B, Condensed matter, 1988