scholarly journals Method for precise evaluation of refractive index modulation amplitude inside the volume Bragg grating recorded in photo-thermo-refractive glass

2018 ◽  
Vol 26 (1) ◽  
pp. 157 ◽  
Author(s):  
Peng Chen ◽  
Dongbing He ◽  
Yunxia Jin ◽  
Junming Chen ◽  
Jingyin Zhao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Bragg Grating ◽  
Refractive Index Modulation ◽  
Modulation Amplitude ◽  
Volume Bragg Grating ◽  
Precise Evaluation ◽  
Index Modulation

Direct Laser Writing of Refractive Index Micro-Structures in Lithium Niobate

2011 ◽  
Vol 222 ◽  
pp. 118-121
Author(s):  
Vygantas Mizeikis ◽  
Vytautas Purlys ◽  
Wataru Inami ◽  
Yoshimasa Kawata
Keyword(s):  
Refractive Index ◽  
Lithium Niobate ◽  
Refractive Index Modulation ◽  
Modulation Amplitude ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Direct Laser ◽  
Micro Structuring ◽  
Micro Structures ◽  
Index Modulation

We report on micro-structuring of iron-doped lithium niobate using femtosecond direct laser writing (DLW) technique. Formation of extended, stable index modulation micro-structures, such as diffraction gratings and linear waveguides is achieved by translation of a focused femtosecond laser beam inside lithium niobate crystals. From diffraction efficiency of the recorded gratings refractive index modulation amplitude of n ~ 10-3 is estimated. It is demonstrated that the recorded structures can be optically erased and re-written.

scholarly journals Quantitative investigation of the refractive-index modulation within the core of a fiber Bragg grating

2006 ◽  
Vol 14 (22) ◽  
pp. 10332 ◽  
Author(s):  
Betty P. Kouskousis ◽  
Claire M. Rollinson ◽  
Daniel J. Kitcher ◽  
Stephen F. Collins ◽  
Greg W. Baxter ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Refractive Index Modulation ◽  
Quantitative Investigation ◽  
The Core ◽  
Index Modulation

scholarly journals Ag nanoparticle-enhanced alkyl radical generation in photopolymerization for holographic recording

Nanophotonics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1795-1802 ◽  
Author(s):  
Jinxin Guo ◽  
Jialing Jian ◽  
Meng Wang ◽  
Yasuo Tomita ◽  
Lin Cao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Ag Nanoparticles ◽  
Polymer Nanocomposite ◽  
Dark Field ◽  
Holographic Recording ◽  
Refractive Index Modulation ◽  
Modulation Amplitude ◽  
Ag Nanoparticle ◽  
Paramagnetic Resonance ◽  
Index Modulation

AbstractWe report a new Ag nanoparticle-dispersed polymer nanocomposite for volume holographic recording through acrylic photopolymerization. The initial grating buildup dynamics at the inhibition stage are measured at various Ag nanoparticle concentrations. The refractive index modulation amplitude as large as 0.0069 at 633 nm is seen at the optimum Ag nanoparticle concentration of 1 wt.% with respect to the monomer. Electron paramagnetic resonance measurements show that Ag nanoparticles influence both the generation of alkyl radicals and the scavenging of oxygen in free radical photopolymerization. This mechanism intrinsically determines the molecular weight of polymer being formed and, thereby, affects the refractive index modulation amplitude of the formed grating as a function of Ag nanoparticle concentrations. Moreover, we confirm that two-beam holographic exposure leads to a periodic assembly of dispersed Ag nanoparticles using a dark-field microscopy. Our results suggest a simple way to control the photopolymerization and, therefore, to tailor polymers for practical uses.

Optical properties of a photopolymer with large refractive index modulation for holographic application

2004 ◽  
Author(s):  
Chang-Won Shin ◽  
Nam Kim ◽  
Won-Sun Kim ◽  
Yong-Cheol Jeong ◽  
Jung-Ki Park
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Refractive Index Modulation ◽  
Index Modulation
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