scholarly journals Ultrasonic Continuous-Wave Beam-Power Measurements; International Intercomparison

1983 ◽  
Vol 88 (2) ◽  
pp. 91 ◽  
Author(s):  
C.E. Tschiegg ◽  
M. Greenspan ◽  
D.G. Eitzen
Keyword(s):  
Continuous Wave ◽  
Wave Beam ◽  
Beam Power ◽  
Power Measurements ◽  
International Intercomparison

834  W, 1769  kHz spectral bandwidth, continuous-wave, beam densely folded Innoslab amplifier

2017 ◽  
Vol 42 (6) ◽  
pp. 1109 ◽  
Author(s):  
Jian Ning ◽  
Kezhen Han ◽  
Jingliang He ◽  
Yiran Wang ◽  
Hongkun Nie ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Wave Beam ◽  
Spectral Bandwidth

Properties Studies of Silver Nanoparticles Colloids in Ethanol Prepared by Means Pulses Laser

2019 ◽  
Vol 60 ◽  
pp. 154-161
Author(s):  
Raad Sh. Alnayli ◽  
Hanan Alkazaali
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Continuous Wave ◽  
Laser Pulses ◽  
Beam Power ◽  
Refractive Indices ◽  
Visible Absorption ◽  
Single Beam ◽  
Non Linear ◽  
Uv Visible

In this work we study the influence of the laser pulses silver nanoparticles productivity during laser ablation of silver immersed in liquid. Ag nanoparticles were synthesized by pulsed laser ablation of Ag targets in ethanol using the (1064 nm, Q-switched, Nd:YAG) laser with energy of 140 mJ per pulse. UV-Visible absorption spectra were used for the characterization and comparison of products. The non-linear refractive index and absorption coefficient of silver nanoparticles were investigated using a single beam z-scan technique; the excitation source was a continuous wave (CW) of 650 nm diode laser with a beam power of 50 mW. All investigated samples showed negative-induced non-linear refractive indices.

Low-power measurements of wave beam parameters along mirror lines on TJ-II

1998 ◽  
Author(s):  
Konstantin M. Likin ◽  
Alberto M. Fernandez ◽  
R. Martin ◽  
Mario Sorolla ◽  
J. R. Cepero
Keyword(s):  
Low Power ◽  
Wave Beam ◽  
Beam Parameters ◽  
Power Measurements

Effect of Laser Surface Modification and Tempering Process on Microstructure and Hardness Profiles of Roll Materials

2011 ◽  
Vol 314-316 ◽  
pp. 1900-1905 ◽  
Author(s):  
Gen Zhe Huang ◽  
Zeng Hui Li ◽  
Jian Yin Tang
Keyword(s):  
Phase Transformation ◽  
Surface Modification ◽  
Continuous Wave ◽  
High Speed Steel ◽  
Melting Zone ◽  
Laser Surface ◽  
Beam Power ◽  
Transformation Zone ◽  
Laser Surface Modification ◽  
Fresh Martensite

Laser surface modification, using a continuous wave CO2 crosscurrent laser with generated beam power of 1 kW, was performed on the adamite steel, indefinite chilled cast iron and high speed steel rolls which were applied to the industries. Optical microscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and micro Vickers hardness test were applied to reveal the microstructural details and hardness profiles of the laser treated zone. The results indicate that, laser treated zones of three roll samples consist of melting zone, phase transformation zone and heat affected zone. After laser treatment, the melting zone have low hardness compared to the phase transformation zone, but after tempering at 540°C for 1 hr, the hardness at the melting zone dramatically increases, because of the formation of the fresh martensite from retained austenite. In contrast, the hardness at the phase transformation zone sharply decreases as fresh martensite changed to tempered martensite. There are many small and well distributed FeS and MnS inclusions in the melting zone at the three roll samples.

Laser Induced Solid-State Grain Growth in Polysilicon Films

1989 ◽  
Vol 157 ◽  
Author(s):  
S.A. Ajuria
Keyword(s):  
Thermal Model ◽  
Direct Relationship ◽  
Continuous Wave ◽  
Incident Beam ◽  
Beam Power ◽  
Continuous Wave Laser ◽  
Steady State Temperature ◽  
Long Time ◽  
Polysilicon Films ◽  
Wave Laser

ABSTRACTWe report studies done on the heating of polysillcon thin films below the melting temperature with long-time (on the order of minutes) continuous-wave laser irradiations. It is shown that a well controlled steady-state temperature is locally established within the film. A thermal model is developed to correlate film temperature to beam intensity and a direct relationship is found. A correlation coefficient of 2.5 K/W/cm2 is empirically determined between film temperature and incident beam power density.

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