29 research outputs found
All-optical modulation of laser light in amorphous silicon-filled microstructured optical fibers
No full textAmorphous silicon is deposited within optical fibers by a high pressure microfluidic deposition process and characterized via Raman spectroscopy. All-optical modulation of 1.55 µm light guided through the silicon core is demonstrated using the free carrier absorption generated by a 532 nm pump pulse. Modulation depths of up to 8.26 dB and modulation frequencies of up to 1.4 MHz are demonstrated
Phase-dependent amplification switching in a double-Raman system
No full textWe experimentally observed phase-dependent optical gain a double-A active Raman gain (ARG) system, which may offer potential applications in quantum field amplification as well as bio-imaging techniques. The optical gain in a double-A ARG system was conditioned by the relative phase between two probe fields. By detuning the double-A ARG system from the optical transition states, spontaneous decay was effectively suppressed, thereby enabling a fully coherent process. By optimizing the multi-photon interaction parameters, we achieved probe field amplification of up to 5 times of their initial intensities. The gain could be all-optically switched off by simply varying the relative phase between the probe fields to it within the loop, demonstrating theoretical analysis of a double-A ARG system.FALSEsciescopu
Phase-dependent light switching in triple-Lambda system
No full textWe theoretically studied a triple-Lambda system comprising three pairs of coupling-probe fields. Three probe fields were phase-dependently switched with a switching depth above 80%, at which the group-velocity matching of all probe pulses was available under slow light-propagation conditions. We considered the probe susceptibility as the superposition of three-photon transitions to systematically understand the multi-photon interference in a triple-Lambda system, which can be applied to systems with N - Lambda (N >= 1). This helped us to tailor the probe susceptibility by adjusting the detuning and phases of the coupling and probe fields. This work can be applied to all-optical switching gates for triple-photons and can enhance the speed of processing optical information. (C) 2015 Optical Society of AmericaFALSEsciescopu
All-optical switching with a biexcitonic double lambda system
No full textA double lambda four level system could be implemented with biexcitonic transitions on GaAs quantum well We observed that the phase dependent biexcitonic transition could be explained by interference between one-photon and three-photon transition in a double lambda four-level system An ultralow-light switch pulse could control 80% of biexcitonic absorption which demonstrated all-optical switching with biexcitonic double lambda system (C) 2010 Elsevier B V All rights reservedFALSEsciescopu
