scholarly journals FORMING OF PHASE PROFILES OF HIGH ORDER DIFFRACTIVE ELEMENTS IN HALCOGENIDE LAYERS

2021 ◽  
Vol 8 ◽  
pp. 204-209
Author(s):  
Valery I. Nalivaiko ◽  
Marina A. Ponomareva
Keyword(s):  
Refractive Index ◽  
Diffraction Efficiency ◽  
High Vacuum ◽  
Diffraction Order ◽  
High Order ◽  
Diffractive Optics ◽  
Maximum Efficiency ◽  
Glassy Materials ◽  
High Diffraction ◽  
High Diffraction Order

The possibility of obtaining diffractive optics of a high diffraction order in the form of linear and circular elements in layers of chalcogenide glassy materials is shown. The conditions for obtaining layers by means of automated thermal deposition of them in high vacuum have been improved, which made it possible to double the amplitude of photostructural changes in the refractive index. The maximum diffraction efficiency of the second order of diffraction for linear gratings is obtained. The prospect of manufacturing zone plates with a maximum efficiency of up to 30 orders of magnitude of diffraction is shown.

scholarly journals Effect of Glycerol on an N-Vinylpyrrolidone-Based Photopolymer for Transmission Holography

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1754
Author(s):  
Huishi Pi ◽  
Weiping Li ◽  
Zhiwei Shi ◽  
Haining Chen ◽  
Xiaoyu Jiang
Keyword(s):  
Molecular Structure ◽  
Refractive Index ◽  
Diffraction Efficiency ◽  
Optimal Concentration ◽  
Diffractive Optics ◽  
Holographic Recording ◽  
Control Group ◽  
Refractive Index Modulation ◽  
Spatial Frequencies ◽  
Index Modulation

N-vinylpyrrolidone (NVP) has a large molecular structure, so it is difficult to diffuse during holographic recording, especially at low spatial frequencies. We used glycerol to promote the diffusion of NVP, and successfully improved the holographic performance of the photopolymer at low spatial frequencies. As the concentration of glycerol increases, the holographic performance first increases and then remains stable. The optimal concentration of glycerol is 0.21 mol/L. At this concentration, the maximum diffraction efficiency of the photopolymer is 84%, the refractive index modulation is 1.95 × 10−3, and the photosensitive sensitivity is 7.91 × 10−4 cm2/mJ. Compared with the control group, the maximum diffraction efficiency, maximum refractive index modulation and photosensitivity at low spatial frequencies (800 lp/mm) have increased by 11.19 times, 4.69 times and 1.71 times, respectively. Using the optimized photopolymer for transmission holographic recording and reproduction, we have obtained a clear and bright transmission hologram. The photopolymer modified with glycerol is expected to be applied to the fields of holography, diffractive optics, and so on.

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

2005 ◽  
Vol 44 (7A) ◽  
pp. 4989-4996
Author(s):  
Seok-Hwan Jeong ◽  
Shinji Matsuo ◽  
Yuzo Yoshikuni ◽  
Toru Segawa ◽  
Yoshitaka Ohiso ◽  
...  
Keyword(s):  
Laser Diodes ◽  
Tunable Laser ◽  
Diffraction Order ◽  
Tunable Filter ◽  
High Diffraction ◽  
High Diffraction Order

High diffraction efficiency for multi-layer dielectric gratings with rectangular groove

2008 ◽  
Author(s):  
Weijin Kong ◽  
Maojin Yun ◽  
Cuichun Ling ◽  
Xin Sun ◽  
Jianda Shao ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Dielectric Gratings ◽  
High Diffraction Efficiency ◽  
Rectangular Groove ◽  
High Diffraction
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