In situ observation of dynamics of plasma formation and refractive index modification in silica glasses excited by a femtosecond laser

2003 ◽  
Author(s):  
Sung-Hak Cho ◽  
Hiroshi Kumagai ◽  
Katsumi Midorikawa
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Plasma Formation ◽  
In Situ Observation ◽  
Silica Glasses

In situ observation of photoinduced refractive-index changes in filaments formed in glasses by femtosecond laser pulses

2001 ◽  
Vol 26 (1) ◽  
pp. 19 ◽  
Author(s):  
Kazuhiro Yamada ◽  
Wataru Watanabe ◽  
Tadamasa Toma ◽  
Kazuyoshi Itoh ◽  
Junji Nishii
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
In Situ Observation ◽  
Index Changes

In situ observation of photo-bleaching in human single living cell excited by a NIR femtosecond laser

2008 ◽  
Vol 254 (11) ◽  
pp. 3370-3375 ◽  
Author(s):  
Sung-Hak Cho ◽  
Won-Seok Chang ◽  
Jae-Goo Kim ◽  
Kyoung-Hyun Whang ◽  
Kyeong-Sook Choi ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Living Cell ◽  
In Situ Observation ◽  
Single Living Cell ◽  
Single Living

scholarly journals A Remote-Sensing Method to Estimate Bulk Refractive Index of Suspended Particles from GOCI Satellite Measurements over Bohai Sea and Yellow Sea

2019 ◽  
Vol 10 (1) ◽  
pp. 23
Author(s):  
Deyong Sun ◽  
Zunbin Ling ◽  
Shengqiang Wang ◽  
Zhongfeng Qiu ◽  
Yu Huan ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Refractive Index ◽  
Spatial Distribution ◽  
Yellow Sea ◽  
Bohai Sea ◽  
Suspended Particles ◽  
In Situ Observation ◽  
Observation Data ◽  
Estimation Model

The bulk refractive index (np) of suspended particles, an apparent measure of particulate refraction capability and yet an essential element of particulate compositions and optical properties, is a critical indicator that helps understand many biogeochemical processes and ecosystems in marine waters. Remote estimation of np remains a very challenging task. Here, a multiple-step hybrid model is developed to estimate the np in the Bohai Sea (BS) and Yellow Sea (YS) through obtaining two key intermediate parameters (i.e., particulate backscattering ratio, Bp, and particle size distribution (PSD) slope, j) from remote-sensing reflectance, Rrs(λ). The in situ observed datasets available to us were collected from four cruise surveys during a period from 2014 to 2017 in the BS and YS, covering beam attenuation (cp), scattering (bp), and backscattering (bbp) coefficients, total suspended matter (TSM) concentrations, and Rrs(λ). Based on those in situ observation data, two retrieval algorithms for TSM and bbp were firstly established from Rrs(λ), and then close empirical relationships between cp and bp with TSM could be constructed to determine the Bp and j parameters. The series of steps for the np estimation model proposed in this study can be summarized as follows: Rrs (λ) → TSM and bbp, TSM → bp → cp → j, bbp and bp → Bp, and j and Bp → np. This method shows a high degree of fit (R2 = 0.85) between the measured and modeled np by validation, with low predictive errors (such as a mean relative error, MRE, of 2.55%), while satellite-derived results also reveal good performance (R2 = 0.95, MRE = 2.32%). A spatial distribution pattern of np in January 2017 derived from GOCI (Geostationary Ocean Color Imager) data agrees well with those in situ observations. This also verifies the satisfactory performance of our developed np estimation model. Applying this model to GOCI data for one year (from December 2014 to November 2015), we document the np spatial distribution patterns at different time scales (such as monthly, seasonal, and annual scales) for the first time in the study areas. While the applicability of our developed method to other water areas is unknown, our findings in the current study demonstrate that the method presented here can serve as a proof-of-concept template to remotely estimate np in other coastal optically complex water bodies.

In situ observation of cell-detachment process initiated by femtosecond laser-induced stress wave

2010 ◽  
Vol 101 (1) ◽  
pp. 127-131 ◽  
Author(s):  
Yasuyo Maezawa ◽  
Yoichiroh Hosokawa ◽  
Kazunori Okano ◽  
Mie Matsubara ◽  
Hiroshi Masuhara
Keyword(s):  
Femtosecond Laser ◽  
Stress Wave ◽  
In Situ Observation ◽  
Cell Detachment ◽  
Induced Stress

In Situ Observation of Etching Processes of Silica Glasses by Silicon Melts

1996 ◽  
Vol 35 (Part 1, No. 6A) ◽  
pp. 3547-3552 ◽  
Author(s):  
Atsushi Ikari ◽  
Syuitsu Matsuo ◽  
Kazutaka Terashima ◽  
Shigeyuki Kimura
Keyword(s):  
In Situ Observation ◽  
Silica Glasses
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