Real-time in situ monitoring of antireflection coatings for semiconductor laser amplifiers by ellipsometry

1992 ◽  
Vol 4 (9) ◽  
pp. 991-993 ◽  
Author(s):  
I.-F. Wu ◽  
I. Riant ◽  
J.-M. Verdiell ◽  
M. Dagenais
Keyword(s):  
Semiconductor Laser ◽  
Real Time ◽  
In Situ Monitoring ◽  
Antireflection Coatings ◽  
Laser Amplifiers ◽  
Semiconductor Laser Amplifiers

Broadband Double-Layer Antireflection Coatings for Semiconductor Laser Amplifiers

1997 ◽  
Vol 36 (Part 2, No. 1A/B) ◽  
pp. L52-L54 ◽  
Author(s):  
Jungkeun Lee ◽  
Toshiki Tanaka ◽  
Seiji Uchiyama ◽  
Masahiro Tsuchiya ◽  
Takeshi Kamiya
Keyword(s):  
Semiconductor Laser ◽  
Double Layer ◽  
Antireflection Coatings ◽  
Laser Amplifiers ◽  
Semiconductor Laser Amplifiers

scholarly journals A sample cell for the study of enzyme-induced carbonate precipitation at the grain-scale and its implications for biocementation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jennifer Zehner ◽  
Anja Røyne ◽  
Pawel Sikorski
Keyword(s):  
Real Time ◽  
Laser Scanning Microscopy ◽  
In Situ Monitoring ◽  
Confocal Laser ◽  
Precipitation Process ◽  
Successful Implementation ◽  
Detailed Knowledge ◽  
Carbonate Precipitation ◽  
Sample Cell

AbstractBiocementation is commonly based on microbial-induced carbonate precipitation (MICP) or enzyme-induced carbonate precipitation (EICP), where biomineralization of $$\text {CaCO}_{3}$$ CaCO 3 in a granular medium is used to produce a sustainable, consolidated porous material. The successful implementation of biocementation in large-scale applications requires detailed knowledge about the micro-scale processes of $$\text {CaCO}_{3}$$ CaCO 3 precipitation and grain consolidation. For this purpose, we present a microscopy sample cell that enables real time and in situ observations of the precipitation of $$\text {CaCO}_{3}$$ CaCO 3 in the presence of sand grains and calcite seeds. In this study, the sample cell is used in combination with confocal laser scanning microscopy (CLSM) which allows the monitoring in situ of local pH during the reaction. The sample cell can be disassembled at the end of the experiment, so that the precipitated crystals can be characterized with Raman microspectroscopy and scanning electron microscopy (SEM) without disturbing the sample. The combination of the real time and in situ monitoring of the precipitation process with the possibility to characterize the precipitated crystals without further sample processing, offers a powerful tool for knowledge-based improvements of biocementation.

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