In this study, self-pulsating microparticles have been successfully prepared using a pH-sensitive and permselective membrane system.
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Chaotic light at mid-infrared wavelength.
Light Sci Appl
June 2016
CNRS LTCI, Télécom ParisTech, Université Paris Saclay, 75634 Paris Cedex 13, France.
The onset of nonlinear dynamics and chaos is evidenced in a mid-infrared distributed feedback quantum cascade laser both in the temporal and frequency domains. As opposed to the commonly observed route to chaos in semiconductor lasers, which involves undamping of the laser relaxation oscillations, quantum cascade lasers first exhibit regular self-pulsation at the external cavity frequency before entering into a chaotic low-frequency fluctuation regime. The bifurcation sequence, similar to that already observed in class A gas lasers under optical feedback, results from the fast carrier relaxation dynamics occurring in quantum cascade lasers, as confirmed by numerical simulations.
View Article and Find Full Text PDFCycles of self-pulsations in a photonic integrated circuit.
Phys Rev E Stat Nonlin Soft Matter Phys
December 2015
NTT Communication Science Laboratories, NTT Corporation, 3-1 Morinosato, Wakamiya, Atsugi-Shi, Kanagawa 243-0198, Japan.
We report experimentally on the bifurcation cascade leading to the appearance of self-pulsation in a photonic integrated circuit in which a laser diode is subjected to delayed optical feedback. We study the evolution of the self-pulsing frequency with the increase of both the feedback strength and the injection current. Experimental observations show good qualitative accordance with numerical results carried out with the Lang-Kobayashi rate equation model.
View Article and Find Full Text PDFWe demonstrate a high-power narrowband all-fiber superfluorescent fiber source employing three-stages master oscillator power-amplifier chain. Narrowband seed light is selected from a broadband-amplified spontaneous-emission source by a spectrum filter combing with fiber circulator and fiber Bragg grating. In the main amplifier, the maximal output power is 1.
View Article and Find Full Text PDFSelf-pulsation observed in pH-sensitive microcapsules.
Chem Commun (Camb)
January 2013
Department of Chemistry and Applied Chemistry, Saga University, 1 Honjo, Saga 840-8502, Japan.
In this study, self-pulsating microparticles have been successfully prepared using a pH-sensitive and permselective membrane system.
View Article and Find Full Text PDFInstabilities in a grating feedback external cavity semiconductor laser.
Opt Express
October 2008
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Output power fluctuations in a grating external cavity diode laser with Littman configuration are described, showing peculiar chaotic behaviors of self-pulsation at the L-I curve kink points. Different spectral characteristics with multiple peaks are observed at upper and lower state of the self-pulsation. It is found also that P-N junction voltage jumps in a same pace with the pulsation.
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