Tunable linearly chirped fiber-Bragg-grating-based 20-50-GHz pulse repetition rate multiplication of a 10-GHz pulse source

2005 ◽  
Author(s):  
Ju Han Lee ◽  
You Min Chang ◽  
Young-Geun Han ◽  
Sang Hyuck Kim ◽  
Sang Bae Lee
Keyword(s):  
Fiber Bragg Grating ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition ◽  
Bragg Grating ◽  
Pulse Source ◽  
Chirped Fiber Bragg Grating

scholarly journals 2 ~ 5 times tunable repetition-rate multiplication of a 10 GHz pulse source using a linearly tunable, chirped fiber Bragg grating

2004 ◽  
Vol 12 (17) ◽  
pp. 3900 ◽  
Author(s):  
Ju Han Lee ◽  
You Min Chang ◽  
Young-Geun Han ◽  
Sang Hyuck Kim ◽  
Sang Bae Lee
Keyword(s):  
Fiber Bragg Grating ◽  
Repetition Rate ◽  
Bragg Grating ◽  
Pulse Source ◽  
Chirped Fiber Bragg Grating

scholarly journals Two Approaches to the Laser-Induced Formation of Au/Ag Bimetallic Nanoparticles in Supercritical Carbon Dioxide

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1553
Author(s):  
Alexey Rybaltovsky ◽  
Evgeniy Epifanov ◽  
Dmitriy Khmelenin ◽  
Andrey Shubny ◽  
Yuriy Zavorotny ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Ag Nanoparticles ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Bimetallic Nanoparticles ◽  
Side Wall ◽  
Pulse Repetition ◽  
Gold Core ◽  
Supercritical Carbon

Two approaches are proposed for the synthesis of bimetallic Au/Ag nanoparticles, using the pulsed laser ablation of a target consisting of gold and silver plates in a medium of supercritical carbon dioxide. The differences between the two approaches related to the field of “green chemistry” are in the use of different geometric configurations and different laser sources when carrying out the experiments. In the first configuration, the Ag and Au targets are placed side-by-side vertically on the side wall of a high-pressure reactor and the ablation of the target plates occurs alternately with a stationary “wide” horizontal beam with a laser pulse repetition rate of 50 Hz. In the second configuration, the targets are placed horizontally at the bottom of a reactor and the ablation of their parts is carried out by scanning from above with a vertical “narrow” laser beam with a pulse repetition rate of 60 kHz. The possibility of obtaining Ag/Au alloy nanoparticles is demonstrated using the first configuration, while the possibility of obtaining “core–shell” bimetallic Au/Ag nanoparticles with a gold core and a silver shell is demonstrated using the second configuration. A simple model is proposed to explain the obtained results.

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