scholarly journals Research on underwater ranging with intensity modulated 532 nm laser source

2021 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
◽  
◽  
Keyword(s):  
Laser Source ◽  
Intensity Modulated ◽  
532 Nm

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 Cu Nanoparticles preparation by Laser Ablation in Liquid Phase method (LALP)

2019 ◽  
Vol 17 (42) ◽  
pp. 141-146
Author(s):  
Zaydoon Tariq Noori
Keyword(s):  
Aqueous Media ◽  
Laser Source ◽  
Phase Method ◽  
Laser Ablation In Liquid ◽  
Visible Absorption ◽  
Copper Target ◽  
Liquid Phase Method ◽  
Afm Analysis ◽  
532 Nm ◽  
Development Applications

Nanoparticle has pulled in expanding consideration with the developing enthusiasm for nanotechnology which hold potential as essential segments for development applications. In the present work, a copper nanoparticle is manufactured as a suspension in distilled water by beating a bulk copper target with laser source (532 nm wavelength, 10 ns pulse duration and 10 Hz repletion rate) via method. UV- visible absorption spectra and AFM analysis has been done to observe the effect of repetition rate for the pulsation of laser. Copper nanoparticles (Cu-NPs) were successfully synthesized with green color. The Cu- NPs have very high purity because the preparation was managed in aqueous media to eliminate ambient contaminations.  Absorption spectrum shows peaks at 450 nm- 700 nm µm due to the generation of Cu-NPs.  

RF Intensity Modulated Pulses at 532 nm Wavelength for Under Water Detection

2017 ◽  
Author(s):  
LiJun Cheng ◽  
SuHui Yang ◽  
Hai Yang Zhang ◽  
BingJie Sun ◽  
ChangMing Zhao
Keyword(s):  
Intensity Modulated ◽  
Water Detection ◽  
532 Nm

scholarly journals Picosecond Laser Interference Patterning of Periodical Micro-Architectures on Metallic Molds for Hot Embossing

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3409 ◽  
Author(s):  
Yangxi Fu ◽  
Marcos Soldera ◽  
Wei Wang ◽  
Bogdan Voisiat ◽  
Andrés Fabián Lasagni
Keyword(s):  
Picosecond Laser ◽  
Processing Parameters ◽  
Hot Embossing ◽  
Surface Structures ◽  
Laser Source ◽  
Laser Interference ◽  
Periodic Surface ◽  
Direct Laser ◽  
Direct Laser Interference Patterning ◽  
532 Nm

In this work, it is demonstrated that direct laser interference patterning (DLIP) is a method capable of producing microtextured metallic molds for hot embossing processes. Three different metals (Cr, Ni, and Cu), relevant for the mold production used in nanoimprinting systems, are patterned by DLIP using a picosecond laser source emitting at a 532 nm wavelength. The results show that the quality and surface topography of the produced hole-like micropatterns are determined by the laser processing parameters, such as irradiated energy density and the number of pulses. Laser-induced periodic surface structures (LIPSS) are also observed on the treated surfaces, whose shapes, periodicities, and orientations are strongly dependent on the accumulated fluence. Finally, the three structured metals are used as embossing molds to imprint microlenses on polymethyl methacrylate (PMMA) foils using an electrohydraulic press. Topographical profiles demonstrate that the obtained structures are comparable to the masters showing a satisfactory reproduction of the texture. The polymeric microlens arrays that showed the best surface homogeneity and overall quality were those embossed with the Cr molds.

SECOND HARMONIC GENERATION IN FERROELECTRIC LiTaO3 AND KNbO3 CONTAINING BULK NANO GLASS-CERAMICS

2011 ◽  
Vol 20 (01) ◽  
pp. 49-61 ◽  
Author(s):  
ANAL TARAFDER ◽  
KALYANDURG ANNAPURNA ◽  
REENAMONI SAIKIA CHALIHA ◽  
SRINIBAS SATAPATHY ◽  
VIDYA SAGAR TIWARI ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Power Output ◽  
Applied Field ◽  
Rotation Angle ◽  
Second Harmonic ◽  
Glass Ceramics ◽  
Laser Source ◽  
Ferroelectric Domains ◽  
Controlled Crystallization ◽  
532 Nm

The precursor glasses in (mol%) 25.53Li2O-21.53Ta2O5-35.29SiO2-17.65Al2O3 (LTSA) and 25K2O-25Nb2O5-50SiO2 (KNS) glass systems were prepared by the melt-quench technique. Ferroelectric LiTaO3 (LT) and KNbO3 (KN) crystallites containing bulk nano glass-ceramics have been prepared by controlled crystallization of these precursor glasses respectively. Second harmonic generations (SHG) at 532 nm in both the glass-ceramics have been realized under fundamental beam of Nd3+ :YAG laser source (1064 nm). The SHG power output has been found to increase up to 14 and 62.4 nJ with variation of rotation angle for LT and KN bulk nano glass-ceramics respectively due to orientation of ferroelectric domains under applied field.

Highly Efficient Intensity-Modulated 532-nm Laser Based on Second Harmonic Generation with MgO∶PPLN Cascade

2019 ◽  
Vol 39 (6) ◽  
pp. 0614003
Author(s):  
李坤 Kun Li ◽  
杨苏辉 Suhui Yang ◽  
王欣 Xin Wang ◽  
李卓 Zhuo Li ◽  
张金英 Jinying Zhang
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Intensity Modulated ◽  
Highly Efficient ◽  
532 Nm

Developmentof Compact 2 kHz mJ-Level 532 nm Laser as Laser Source of Lidar

2014 ◽  
Vol 41 (6) ◽  
pp. 0602005
Author(s):  
Cai Xuwu ◽  
Yuan Zijun ◽  
Wang Li ◽  
Yang Jingwei ◽  
Cheng Tingqing ◽  
...  
Keyword(s):  
Laser Source ◽  
532 Nm

scholarly journals Application of A Frequency Chirped RF Intensity Modulated 532 nm Light Source in Underwater Ranging

2020 ◽  
Vol 12 (5) ◽  
pp. 1-11
Author(s):  
Kun Li ◽  
Suhui Yang ◽  
Yingqi Liao ◽  
Xuetong Lin ◽  
Xin Wang ◽  
...  
Keyword(s):  
Light Source ◽  
Intensity Modulated ◽  
532 Nm

scholarly journals Continuous-wave single-frequency 532 nm laser source emitting 130 W into the fundamental transversal mode

2010 ◽  
Vol 35 (22) ◽  
pp. 3742 ◽  
Author(s):  
Tobias Meier ◽  
Benno Willke ◽  
Karsten Danzmann
Keyword(s):  
Continuous Wave ◽  
Single Frequency ◽  
Laser Source ◽  
Transversal Mode ◽  
532 Nm
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