scholarly journals RECORDING OF DIFFRACTION GRATINGS WITH AN ACTIVE STABILIZATION SCHEME OF INTERFERENCE FIELD

2020 ◽  
Vol 8 (1) ◽  
pp. 146-152
Author(s):  
Valery I. Nalivaiko ◽  
Marina A. Ponomareva
Keyword(s):  
Optical Quality ◽  
Interference Field ◽  
Optoelectronic System ◽  
Recording Time ◽  
High Optical Quality ◽  
Holographic Gratings ◽  
System A ◽  
Large Size ◽  
Active Stabilization ◽  
Optical Circuits

The paper describes a modernized optoelectronic system for stabilizing the interference pattern during exposure of a holographic grating. The results of applying the extreme control system to stabilize the interference field when recording holographic gratings of high optical quality are presented. Thin chalcogenide layers of the composition As2S3 were used as the recording medium. When using the stabilization system, a monotonic increase in the diffraction efficiency of the gratings from the recording time is observed and a low level of spurious scattering is recorded for the recorded gratings. The scheme was experimentally tested when recording holographic gratings up to 60x60 mm2 in size and exposure time up to 30 minutes. The use of an active stabilization scheme will make it possible to record large-size gratings using low-power lasers without the use of additional complex systems for protecting optical circuits from vibration.

scholarly journals Al2O3/TiO2 inverse opals from electrosprayed self-assembled templates

2018 ◽  
Vol 9 ◽  
pp. 216-223 ◽  
Author(s):  
Arnau Coll ◽  
Sandra Bermejo ◽  
David Hernández ◽  
Luís Castañer
Keyword(s):  
Three Dimensional ◽  
Optical Quality ◽  
High Optical Quality ◽  
Inverse Opals ◽  
Large Size ◽  
Fabrication Errors ◽  
Supporting Layer ◽  
Higher Temperature ◽  
Self Assembled ◽  
High Dielectric

The fabrication of high optical quality inverse opals is challenging, requiring large size, three-dimensional ordered layers of high dielectric constant ratio. In this article, alumina/TiO2–air inverse opals with a 98.2% reflectivity peak at 798 nm having an area of 2 cm2 and a thickness of 17 µm are achieved using a sacrificial self-assembled structure of large thickness, which was produced with minimum fabrication errors by means of an electrospray technique. Using alumina as the first supporting layer enables the deposition of TiO2 at a higher temperature, therefore providing better optical quality.

Large holographic gratings on layers of glassy chalcogenide semiconductors of high optical quality

1999 ◽  
Vol 66 (12) ◽  
pp. 1071
Author(s):  
A. V. Lukin ◽  
A. S. Makarov ◽  
F. A. Sattarov ◽  
V. A. Seleznev ◽  
A. F. Skochilov ◽  
...  
Keyword(s):  
Optical Quality ◽  
High Optical Quality ◽  
Holographic Gratings ◽  
Chalcogenide Semiconductors

scholarly journals Czochralski growth of mixed cubic sesquioxide crystals in the ternary system Lu2O3–Sc2O3–Y2O3

2021 ◽  
Vol 77 (4) ◽  
Author(s):  
Christian Kränkel ◽  
Anastasia Uvarova ◽  
Émile Haurat ◽  
Lena Hülshoff ◽  
Mario Brützam ◽  
...  
Keyword(s):  
Ternary System ◽  
Czochralski Method ◽  
Optical Quality ◽  
Czochralski Growth ◽  
High Optical Quality ◽  
Melting Temperatures ◽  
Large Size ◽  
Host Materials ◽  
Thermal Investigations ◽  
First Time

Cubic rare-earth sesquioxide crystals are strongly demanded host materials for high power lasers, but due to their high melting points investigations on their thermodynamics and the growth of large-size crystals of high optical quality remain a challenge. Detailed thermal investigations of the ternary system Lu2O3–Sc2O3–Y2O3 revealing a large range of compositions with melting temperatures below 2200°C and a minimum of 2053°C for the composition (Sc0.45Y0.55)2O3 are presented. These reduced temperatures enable for the first time the growth of high optical quality mixed sesquioxide crystals with disordered structure by the conventional Czochralski method from iridium crucibles. An (Er0.07Sc0.50Y0.43)2O3 crystal is successfully grown and characterized with respect to its crystallographic properties as well as its composition, thermal conductivity and optical absorption in the 1 µm range.

scholarly journals A Nanoscale Photonic Crystal Cavity Optomechanical System for Ultrasensitive Motion Sensing

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 462
Author(s):  
Ji Xia ◽  
Fuyin Wang ◽  
Chunyan Cao ◽  
Zhengliang Hu ◽  
Heng Yang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Optical Cavity ◽  
Optical Quality ◽  
Optical Force ◽  
Mechanical Oscillator ◽  
Maximum Displacement ◽  
Optomechanical System ◽  
High Optical Quality ◽  
Hybrid Platform ◽  
Optomechanical Coupling

Optomechanical nanocavities open a new hybrid platform such that the interaction between an optical cavity and mechanical oscillator can be achieved on a nanophotonic scale. Owing to attractive advantages such as ultrasmall mass, high optical quality, small mode volume and flexible mechanics, a pair of coupled photonic crystal nanobeam (PCN) cavities are utilized in this paper to establish an optomechanical nanosystem, thus enabling strong optomechanical coupling effects. In coupled PCN cavities, one nanobeam with a mass meff~3 pg works as an in-plane movable mechanical oscillator at a fundamental frequency of . The other nanobeam couples light to excite optical fundamental supermodes at and 1554.464 nm with a larger than 4 × 104. Because of the optomechanical backaction arising from an optical force, abundant optomechanical phenomena in the unresolved sideband are observed in the movable nanobeam. Moreover, benefiting from the in-plane movement of the flexible nanobeam, we achieved a maximum displacement of the movable nanobeam as 1468 . These characteristics indicate that this optomechanical nanocavity is capable of ultrasensitive motion measurements.

High optical quality GaN nanopillar arrays

2005 ◽  
Vol 86 (7) ◽  
pp. 071917 ◽  
Author(s):  
Y. D. Wang ◽  
S. J. Chua ◽  
S. Tripathy ◽  
M. S. Sander ◽  
P. Chen ◽  
...  
Keyword(s):  
Optical Quality ◽  
High Optical Quality ◽  
Nanopillar Arrays

Fabrication of ALF3-Based Glass Fibers

1989 ◽  
Vol 172 ◽  
Author(s):  
Mahmoud R. Shahriari ◽  
Tariq Iqbal ◽  
Paul R. Foy ◽  
Steve J. Saggese ◽  
G. H. Sigel
Keyword(s):  
Thermal Properties ◽  
Laser Power ◽  
Short Range ◽  
Glass Fibers ◽  
Optical Quality ◽  
Chemical Durability ◽  
Power Delivery ◽  
Mechanical And Thermal Properties ◽  
High Optical Quality ◽  
Remote Spectroscopy

AbstractSeveral glass systems based on AIF3 have been synthesized and fabricated into preforms by controlled melting and rotational casting. High optical quality preforms have been drawn into fibers using a specially modified drawing facility. The drawing tower is enclosed with a vertical glove box in which the levels of both moisture and oxygen are kept below 1 ppm during the drawing. The AIF3 -based fibers have shown dramatically superior chemical durability relative to the ZrF4 -based glass fibers. Selected optical, mechanical and thermal properties of these fibers will be presented. AIF3 -based glass fibers offer interesting opportunities for short range applications in the 2–4 micron region of the infrared such as sensing, remote spectroscopy and laser power delivery.

Catalyst-free growth of high-optical quality GaN nanowires by metal-organic vapor phase epitaxy

2011 ◽  
Vol 99 (25) ◽  
pp. 251910 ◽  
Author(s):  
X. J. Chen ◽  
B. Gayral ◽  
D. Sam-Giao ◽  
C. Bougerol ◽  
C. Durand ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Optical Quality ◽  
Vapor Phase Epitaxy ◽  
High Optical Quality ◽  
Organic Vapor ◽  
Gan Nanowires ◽  
Catalyst Free ◽  
Metal Organic ◽  
Free Growth
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