Nonlinear Beam Shaping with Femtosecond Laser-Induced Volume Phase Holograms in Lithium Niobate

2016 ◽  
Author(s):  
Jörg Imbrock ◽  
Haissam Hanafi ◽  
Dennis Niemeier ◽  
Mousa Ayoub ◽  
Cornelia Denz
Keyword(s):  
Lithium Niobate ◽  
Femtosecond Laser ◽  
Beam Shaping ◽  
Nonlinear Beam ◽  
Volume Phase ◽  
Phase Holograms

Information storage in ferroelectrics: thermal fixing

1988 ◽  
Vol 66 (8) ◽  
pp. 655-658 ◽  
Author(s):  
Fayez El Guibaly
Keyword(s):  
Lithium Niobate ◽  
Information Storage ◽  
Phenomenological Parameter ◽  
Volume Phase ◽  
Ferroelectric Crystals ◽  
Thermal Fixing ◽  
Phase Holograms

Techniques for rendering permanent volume-phase holograms stored in ferroelectric crystals are discussed. An analysis is developed for the thermal fixing technique. The analysis identifies a phenomenological parameter that indicates whether or not thermal fixing would be successful for a given crystal. The results are applied to explain experimental observations for thermal fixing of holograms in lithium niobate (LiNbO3) crystals.

scholarly journals Efficient nonlinear beam shaping in three-dimensional lithium niobate nonlinear photonic crystals

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Dunzhao Wei ◽  
Chaowei Wang ◽  
Xiaoyi Xu ◽  
Huijun Wang ◽  
Yanlei Hu ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Photonic Crystals ◽  
Second Harmonic ◽  
Three Dimensional ◽  
Matching Condition ◽  
Beam Shaping ◽  
Phase Matching ◽  
Nonlinear Beam ◽  
Nonlinear Photonic Crystals ◽  
Low Efficiency

Abstract Nonlinear beam shaping refers to spatial reconfiguration of a light beam at a new frequency, which can be achieved by using nonlinear photonic crystals (NPCs). Direct nonlinear beam shaping has been achieved to convert second-harmonic waves into focusing spots, vortex beams, and diffraction-free beams. However, previous nonlinear beam shaping configurations in one-dimensional and two-dimensional (2D) NPCs generally suffer from low efficiency because of unfulfilled phase-matching condition. Here, we present efficient generations of second-harmonic vortex and Hermite-Gaussian beams in the recently-developed three-dimensional (3D) lithium niobate NPCs fabricated by using a femtosecond-laser-engineering technique. Since 3D χ(2) modulations can be designed to simultaneously fulfill the requirements of nonlinear wave-front shaping and quasi-phase-matching, the conversion efficiency is enhanced up to two orders of magnitude in a tens-of-microns-long 3D NPC in comparison to the 2D case. Efficient nonlinear beam shaping paves a way for its applications in optical communication, super-resolution imaging, high-dimensional entangled source, etc.

Profiles in volume phase holograms in Cp2TiCl2:PMMA

1988 ◽  
Vol 46 (2) ◽  
pp. 157-164 ◽  
Author(s):  
T. L�ckemeyer ◽  
H. Franke
Keyword(s):  
Volume Phase ◽  
Phase Holograms

Selective properties of volume phase holograms in photorefractive crystals

1982 ◽  
Vol 40 (3) ◽  
pp. 175-178 ◽  
Author(s):  
T.G. Pencheva ◽  
M.P. Petrov ◽  
S.I. Stepanov
Keyword(s):  
Photorefractive Crystals ◽  
Volume Phase ◽  
Phase Holograms

Beam-shaping via femtosecond laser-modified optical fibre end faces

2016 ◽  
Author(s):  
A. Ioannou ◽  
M. Polis ◽  
A. Lacraz ◽  
A. Theodosiou ◽  
K. Kalli
Keyword(s):  
Femtosecond Laser ◽  
Optical Fibre ◽  
Beam Shaping
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