Myocardium tissue ablation with hollow-waveguide-delivered near-infrared nanosecond laser pulses

2001 ◽  
Author(s):  
Shunichi Sato ◽  
Tsunenori Arai ◽  
Yi-Wei Shi ◽  
Yuji Matsuura ◽  
Mitsunobu Miyagi ◽  
...  
Keyword(s):  
Near Infrared ◽  
Laser Pulses ◽  
Tissue Ablation ◽  
Nanosecond Laser ◽  
Hollow Waveguide ◽  
Nanosecond Laser Pulses

Laser Ablation-Induced Plasma Characteristics in Optical Near-Field

2007 ◽  
Author(s):  
David J. Hwang ◽  
Hojeong Jeon ◽  
Costas P. Grigoropoulos
Keyword(s):  
Near Infrared ◽  
Near Field ◽  
Laser Pulses ◽  
Thin Metal Film ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Nanosecond Laser Pulses ◽  
Plasma Characteristics

In this study, detailed characteristics of the optical near-field based ablation-induced plasma are investigated. A Cr thin metal film samples are ablated using visible and near infrared nanosecond laser pulses coupled through an optical near-field fiber probe. The ablated plasma evolution is visualized through time-resolved emission imaging and further analyzed via spectral measurement. Unveiled qualitative differences in optical near-field ablation configuration are discussed in comparison with optical far-field ablation. The measured results support implementation of laser-induced breakdown spectroscopy based on optical near-field ablation.

scholarly journals Nonlinear optical properties of near-infrared region Ag2S quantum dots pumped by nanosecond laser pulses

2015 ◽  
Vol 6 ◽  
pp. 1781-1787 ◽  
Author(s):  
Li-wei Liu ◽  
Si-yi Hu ◽  
Yin-ping Dou ◽  
Tian-hang Liu ◽  
Jing-quan Lin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nonlinear Optical ◽  
Near Infrared ◽  
Laser Pulses ◽  
Optical Response ◽  
Infrared Region ◽  
Nonlinear Optical Response ◽  
Nanosecond Laser ◽  
Nanosecond Laser Pulses ◽  
Near Infrared Region

This study investigates near-infrared region Ag2S quantum dots (QDs) and their nonlinear optical response under 532 nm nanosecond laser pulses. Our experimental result shows that nonlinear transmission is reduced from 0.084 to 0.04. The observed narrowing behavior of the output pulse width shows superior optical limiting. We discuss the physical mechanisms responsible for the nonlinear optical response of the QDs. The average size of the nanocrystals was 5.5 nm. Our results suggest the possibility of using these Ag2S QDs for photoelectric, biosensor, optical ranging, and self-adaptive technologies.

Visible lesion thresholds from near-infrared pico- and nanosecond laser pulses in the primate eye

1997 ◽  
Author(s):  
Clarence P. Cain ◽  
Cynthia A. Toth ◽  
Cheryl D. DiCarlo ◽  
Gary D. Noojin ◽  
Rodney E. Amnotte ◽  
...  
Keyword(s):  
Near Infrared ◽  
Laser Pulses ◽  
Nanosecond Laser ◽  
Visible Lesion ◽  
Nanosecond Laser Pulses

Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses

2010 ◽  
Vol 97-101 ◽  
pp. 3803-3806
Author(s):  
Yong Xiang Hu ◽  
Heng Zhang ◽  
Zheng Qiang Yao
Keyword(s):  
Cost Effective ◽  
Laser Pulses ◽  
Laser Beams ◽  
Nanosecond Laser ◽  
Effective Technique ◽  
First Order ◽  
Direct Fabrication ◽  
Cost Effective Technique ◽  
Nanosecond Laser Pulses ◽  
Micro Structuring

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

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