Comparative study of the diffraction efficiency and scattering of bleached holograms recorded with an Nd:YaG pulsed laser at 532 nm

1993 ◽  
Author(s):  
Sanjay Kumar
Keyword(s):  
Comparative Study ◽  
Diffraction Efficiency ◽  
Pulsed Laser ◽  
532 Nm

Relaxation Polarization Dependence of Circular Vector Gratings in Azobenzene Glassy Molecular Films

2020 ◽  
Vol 850 ◽  
pp. 285-290
Author(s):  
Andris Ozols ◽  
Peteris Augustovs ◽  
Kaspars Traskovskis ◽  
Valdis Kokars ◽  
Lauma Laipniece ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Relaxation Times ◽  
Grating Period ◽  
Volume Density ◽  
Laser Beams ◽  
Relaxation Polarization ◽  
Polarized Beam ◽  
Sandwich Type ◽  
Phd Thesis ◽  
532 Nm

Holographic grating recording and relaxation is studied in different azobenzene molecular glassy films by circularly orthogonally polarized 532 nm laser beams L and R. The readout was made by circularly polarized (R or L) 632.8 nm laser beam. Sandwich-type samples (glass-film-glass) were also studied. Maximum diffraction efficiency of 81% has been achieved in sandwich-type AR-173 film. The following relaxation features have been found: after reaching diffraction efficiency (DE) maximum no DE decay took place; DE read out by R-polarized beam was always higher than that by L-polarized beam; in sandwich-type samples DE decayed until zero when read out by R-polarization whereas DE was zero when read out by L-polarization. 50% relaxation times varied from 4 to 44 minutes, and they mainly decreased when grating period was increased. The observed relaxation peculiarities can be understood if one assumes that volume birefringence grating (VBG) is recorded followed by volume density grating (VDG) and surface relief grating (SRG) recording. R-polarization "feels" all gratings whereas L-polarization only VDG and SRG. At large exposures VDG and SRG dominate. These results confirm the conclusion made by J.Mikelsone in her 2018 PhD thesis that birefringence grating recording in azobenzene materials is a neccessary condition for SRG appearance.

Comparative study of magnetite nanoparticles obtained by pulsed laser ablation in water and air

2019 ◽  
Vol 467-468 ◽  
pp. 402-410 ◽  
Author(s):  
Valery A. Svetlichnyi ◽  
Anastasiia. V. Shabalina ◽  
Ivan N. Lapin ◽  
Darya A. Goncharova ◽  
Tamara S. Kharlamova ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Comparative Study ◽  
Magnetite Nanoparticles ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation

Pulsed Laser Deposition (PLD) Technique to Prepare Biocompatible Thin Films

2006 ◽  
Vol 49 ◽  
pp. 56-61 ◽  
Author(s):  
Joseph J. Beltrano ◽  
Lorenzo Torrisi ◽  
Anna Maria Visco ◽  
Nino Campo ◽  
E. Rapisarda
Keyword(s):  
Thin Films ◽  
Pulsed Laser ◽  
Target Material ◽  
Xrd Analysis ◽  
Spot Size ◽  
Laser Deposition ◽  
Laser Source ◽  
Medical Field ◽  
Hot Plasma ◽  
532 Nm

A Nd:YAG laser is employed to ablate different materials useful in the bio-medical field. The laser source operates in the IR (1064 nm), VIS (532 nm) and UV (355 nm) regions with a pulse duration of 3-9 ns, a pulse energy of 3-300 mJ, a spot size of 1 mm2 and a repetition rate of 1- 30 Hz. Target material of interest are Titanium, Carbon, Hydroxyapatite (HA) and Polyethylene (PE). Laser irradiation occurs in vacuum, where hot plasma is generated, and thin films are deposited on near substrates. Generally, substrates of silicon, titanium, titanium-alloys and polymers were employed. Biocompatible thin films are investigated with different surface techniques, such as IR spectroscopy, Raman spectroscopy, XRD analysis and SEM investigations. Depending of the kind of possible application, films require special properties concerning the grain size, porosity, uniformity, wetting, hardness, adhesion, crystallinity and composition. The obtained results will be presented and discussed with particular regard to HA..

scholarly journals Improvement in the diffraction efficiency of a polymer using an ionic liquid

2018 ◽  
Vol 83 (2) ◽  
pp. 213-220
Author(s):  
Sung Kim ◽  
Pankaj Attri ◽  
In Kim
Keyword(s):  
Diffraction Efficiency ◽  
Information Storage ◽  
Polymer Mixture ◽  
Dihydrogen Phosphate ◽  
Storage Devices ◽  
Dpss Laser ◽  
Photosensitive Polymer ◽  
Diode Pumped ◽  
First Time ◽  
532 Nm

In this paper, photosensitive materials for information storage devices are presented. The polymers were prepared using surface relief-grating (SRG) fabrication with a diode-pumped solid-state (DPSS) laser of 532 nm, and the diffraction efficiency (DE) of the polymers were assessed with a low-power DPSS laser at 633 nm. However, the diffraction efficiency of the azo-functionalized epoxy-based polymer was low, even after 15 min of exposure. To improve the efficiency and reduce the time it takes for the DE measurements of the photosensitive polymer, the polymer was combined ionic liquids (ILs). Various ILs, i.e., 1-methylimidazolium chloride ([Mim]Cl) from the imidazolium family of ILs and diethylammonium dihydrogen phosphate (DEAP), triethylammonium 4-aminotoluene-3-sulfonic acid (TASA) and tributylmethylammonium methyl sulphate (TBMS) from the ammonium family of ILs, were investigated. For the first time, it was observed that DE dramatically increased the DEAP?polymer mixture in 4 min compared to the polymer (alone) and other polymer?IL mixtures. Therefore, DEAP IL could help improve the efficiency of DE measurements in a shorter time.

scholarly journals Comparative study of retinal injuries induced by a 420-750 nm supercontinuum source and a 532 nm laser

2019 ◽  
Vol 10 (6) ◽  
pp. 3018 ◽  
Author(s):  
Luguang Jiao ◽  
Yan Fan ◽  
Jiarui Wang ◽  
Zaifu Yang
Keyword(s):  
Comparative Study ◽  
532 Nm

scholarly journals Qualification of Operational Amplifier used in Satellite Subsystem using Picosecond Pulsed Laser System

2020 ◽  
Vol 9 (2) ◽  
pp. 523-527
Keyword(s):  
Cross Section ◽  
Operational Amplifier ◽  
Second Harmonic ◽  
Laser System ◽  
Threshold Energy ◽  
Pulsed Laser ◽  
Spot Size ◽  
Single Event ◽  
532 Nm ◽  
Pulsed Laser Irradiation

Picosecond Pulsed Laser System (PPLS) was used to simulate the single event effects (SEE) on satellite electronic components. Single event transients effect induced in an operational amplifier (LM324) to determine how transient amplitude and charge collection varied with pulsed laser energies. The wavelength and the focused spot size are the primary factors generating the resultant charge density profile. The degradation performance of LM324 induced by pulsed laser irradiation with two wavelength (1064nm, 532nm) is determined as a function of laser cross section. The transient voltage changed due to pulsed laser hitting specific transistors. This research shows the sensitivity mapping of LM324 under the effect of fundamental and second harmonic wavelengths. Determine the threshold energy of the SET in both wavelength, and compare the laser cross section of 1064 nm beam and 532 nm beam.

Conversion of diamond clusters from a polymer by Nd:YAG pulsed laser (532 nm) irradiation

1999 ◽  
Vol 151 (3-4) ◽  
pp. 244-250 ◽  
Author(s):  
S.M Huang ◽  
Y.F Lu ◽  
Z Sun
Keyword(s):  
Pulsed Laser ◽  
532 Nm
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