Experimental investigation on laser-induced surface damage threshold of Nd-doped phosphate glass

2012 ◽  
Vol 10 (4) ◽  
pp. 041403-41406 ◽  
Author(s):  
Junjiang Hu Junjiang Hu ◽  
Lei Zhang Lei Zhang ◽  
Wei Chen Wei Chen ◽  
Changhe Zhou Changhe Zhou ◽  
Lili Hu Lili Hu
Keyword(s):  
Experimental Investigation ◽  
Phosphate Glass ◽  
Damage Threshold ◽  
Surface Damage

Experimental investigation of enhancing the subsurface damage threshold of Nd-doped phosphate glass

2008 ◽  
Vol 6 (9) ◽  
pp. 681-684 ◽  
Author(s):  
胡俊江 Junjiang Hu ◽  
杨镜新 Jingxin Yang ◽  
陈伟 Wei Chen ◽  
周常河 Changhe Zhou
Keyword(s):  
Experimental Investigation ◽  
Phosphate Glass ◽  
Damage Threshold ◽  
Subsurface Damage

Experimental Investigation on Laser Pretreatment of Optical Films

2011 ◽  
Vol 189-193 ◽  
pp. 3713-3716
Author(s):  
Zhi Lin Xia
Keyword(s):  
Experimental Investigation ◽  
Energy Density ◽  
Pulse Width ◽  
Incidence Angle ◽  
Damage Threshold ◽  
Negative Influence ◽  
Damage Probability ◽  
Optical Films ◽  
Laser Induced Damage ◽  
K9 Glass

Optical films have been prepared on K9 glass by electronic beam evaporation. Parameters of S-polarized Nd: YAG laser used for pretreatment and damage tests are: wavelength is 355nm, pulse width is 8ns, and incidence angle is 33.75 degree. The results reflect that: the influence of laser pretreatment on laser induced damage threshold of films is uncertain. Laser pretreatment not always improve the laser induced damage threshold of films, and sometimes it will cause negative influence. As for damage probability, for a certain testing energy density, there is an energy density scope, pretreatment pulse with energy density in which can reduce the laser induced damage probability of films. The energy density of laser pretreatment pulse should be selected according to the serving conditions of films.

scholarly journals Studies on Structural, Spectral, and Optical Properties of Organic Nonlinear Optical Single Crystal: 2-Amino-4,6-dimethylpyrimidinium p-Hydroxybenzoate

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
S. Sudhahar ◽  
M. Krishna Kumar ◽  
A. Silambarasan ◽  
R. Muralidharan ◽  
R. Mohan Kumar
Keyword(s):  
Single Crystal ◽  
Grown Crystal ◽  
Second Harmonic ◽  
Visible Spectrum ◽  
Damage Threshold ◽  
Surface Damage ◽  
Second Harmonic Generation Efficiency ◽  
Cell Parameters ◽  
Infrared Spectral ◽  
Growth Method

2-Amino-4,6-dimethylpyrimidinium p-hydroxybenzoate (ADPHB), a novel organic material, was synthesized, and crystals were grown by slow evaporation solution growth method. The cell parameters and crystalline perfection of the grown crystal were studied by single crystal and powder X-ray diffraction analyses. The presence of various functional groups of the grown crystal was confirmed using Fourier Transform infrared spectral analysis. UV-Visible spectrum shows that ADPHB crystals have high transmittance in the range 305–900 nm. The refractive index and transient photoluminescence properties of the grown crystal were analyzed. The laser induced surface damage threshold, optical birefringence, and second harmonic generation efficiency of the grown crystal were studied.

Optical and Mechanical Studies on Methyl N- Phenylsuccinamate (MPS)

2012 ◽  
Vol 584 ◽  
pp. 51-55
Author(s):  
P. Vivek ◽  
P. Murugakoothan
Keyword(s):  
Grown Crystal ◽  
Second Harmonic ◽  
Damage Threshold ◽  
Surface Damage ◽  
Optical Transmittance ◽  
Generation Efficiency ◽  
Second Harmonic Generation Efficiency ◽  
Slow Evaporation Technique ◽  
Evaporation Technique ◽  
Mechanical Studies

Single crystal of organic material Methyl N- phenylsuccinamate (MPS) has been grown by the slow evaporation technique using methanol as a solvent. The crystal belongs to orthorhombic system with non centrosymmetric space group Pna21. Optical transmittance and second harmonic generation efficiency of the grown crystals have been studied by UV-vis-NIR spectrum and Kurtz powder technique respectively. The transmittance of MPS crystal has been used to calculate the refractive index (n), the extinction coefficient (k) and reflectance (R). The laser induced surface damage threshold for the grown crystal has been measured using Nd:YAG laser. The mechanical behaviour of the MPS crystal has also been analyzed.

Numerical simulation on 1 on 1 surface damage threshold test of fused SiO2with Monte Carlo method

2015 ◽  
Author(s):  
Rongsheng Ba ◽  
Xinda Zhou ◽  
Yinbo Zheng ◽  
Jing Yuan ◽  
Lei Ding ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Damage Threshold ◽  
Surface Damage ◽  
Threshold Test

scholarly journals Express method of estimating laser-induced surface damage threshold for optical components

2002 ◽  
Vol 20 (1) ◽  
pp. 133-137 ◽  
Author(s):  
V.S. SIRAZETDINOV ◽  
V.N. ALEKSEEV ◽  
D.I. DMITRIEV ◽  
A.V. CHARUKHCHEV ◽  
V.N. CHERNOV ◽  
...  
Keyword(s):  
Laser System ◽  
Damage Threshold ◽  
Surface Damage ◽  
Film Coating ◽  
Statistical Nature ◽  
Thin Film Coating ◽  
Optical Elements ◽  
Optical Components ◽  
System A ◽  
Laser Induced Damage

The present measurements of the components' surface resistance to laser-induced damage has been completed to facilitate development and construction of the “Luch” laser system, a four-channel Nd-phosphate glass laser with a full output energy of E = 14–16 kJ. The study describes a method that, with a series of experimental data obtained from a single sample, allows us not only to estimate the threshold fluences, but to take into account the statistical nature of the surface damage. In a number of experimental situations this method makes it possible to estimate damaging fluences even from the result of a single exposure of the studied surface. Estimated threshold fluences for various optical elements are presented: K8 glass, experimental phosphate laser glass KGSS-0180, high-reflecting and antireflecting thin-film coating of elements. The 1.054-μm radiation pulse with half-height duration of 4 ns and the irradiation spot of ∼4 mm in diameter were used in the experiment.

scholarly journals Assessment of Microhardness Profile in Grinding Using Barkhausen Noise Technique at Various Analysis Parameters

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
Saurabh Kumar ◽  
Mukesh Yadav ◽  
Prateek Agrawal ◽  
Mohd Zaheer Khan ◽  
Meghanshu Vashista
Keyword(s):  
Experimental Investigation ◽  
Phase Transformation ◽  
Root Mean Square ◽  
Excitation Frequency ◽  
Surface Damage ◽  
Barkhausen Noise ◽  
Mean Square ◽  
Metallographic Study ◽  
Analysis Technique ◽  
Microhardness Profile

An experimental investigation was carried out to study the effect of variation in Barkhausen noise (BN) analysis parameters (magnetizing voltage and excitation frequency) for assessment of microhardness profile upon surface grinding. A varying amount of surface damage was induced in the ground samples by changing the downfeed during grinding. It was observed that variation in microhardness inversely affects root mean square (rms) value of BN signal. The observed BN profile indicated no phase transformation or microstructural changes upon grinding. Metallographic study of ground samples has been undertaken to confirm the results obtained by BN analysis. Barkhausen noise parameter (rms value of BN signal), at elevated magnetizing voltage and excitation frequency, increased with reduction in microhardness along the depth indicating the applicability of BN analysis technique in assessing the microhardness profile of ground steel.

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