Micrometer accuracy method for small-scale laser focal spot centroid measurement

2015 ◽  
Vol 66 ◽  
pp. 58-62 ◽  
Author(s):  
Xiaoyan Liu ◽  
Zhiwei Lu ◽  
Xin Wang ◽  
Dexin Ba ◽  
Chengyu Zhu
Keyword(s):  
Focal Spot ◽  
Small Scale ◽  
Laser Focal Spot

scholarly journals Influences of Analog-to-Digital Conversion Accuracy and Response Uniformity of CCD on Small-Scale Laser Focal Spot Measurements

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xiaoyan Liu ◽  
Dexin Ba ◽  
Deqiang Jiao ◽  
Xiangxin Shao ◽  
Xin Mu ◽  
...  
Keyword(s):  
Measurement Error ◽  
Focal Spot ◽  
Gaussian Function ◽  
Maximum Error ◽  
Small Scale ◽  
Effective Solution ◽  
Digital Conversion ◽  
Analog To Digital ◽  
Analog To Digital Conversion ◽  
Laser Focal Spot

The two-dimensional snake scanning of the CCD method provides an effective solution to measure small-scale light spots which are smaller than one CCD pixel. The influences of the A/D conversion digits and response uniformity of the CCD on the measurement error are studied. When the A/D conversion digit is 20, the measurement error can be ignored. The maximum error value of the nonuniform response of the CCD pixel when the order of the super-Gaussian function is 10 is 0.7 μm. The research results can be used to guide the experiment.

scholarly journals High-precision small-scale laser focal spot measurements

2013 ◽  
Vol 31 (1) ◽  
pp. 177-183 ◽  
Author(s):  
Z.W. Lu ◽  
X.Y. Liu ◽  
X. Wang ◽  
D.X. Ba ◽  
Z.H. Jiang ◽  
...  
Keyword(s):  
Background Noise ◽  
Measurement Accuracy ◽  
Focal Spot ◽  
Small Scale ◽  
Two Dimensional ◽  
Charge Coupled Device ◽  
Spot Diameter ◽  
Focal Spot Diameter ◽  
Laser Focal Spot ◽  
Better Than

AbstractIn this paper, a method of two-dimensional fine-scanning with charge coupled device has been conducted to precisely measure spatial position and intensity distribution of small-scale focal spot (diameter in microns). The measurement accuracy of the small-scale focal spot position is better than 1 µm when the fluctuations of the light energy and background noise are relatively small. The theoretical analysis is consistent with the experimental results.

scholarly journals Dependence of laser accelerated protons on laser energy following the interaction of defocused, intense laser pulses with ultra-thin targets

2011 ◽  
Vol 29 (3) ◽  
pp. 345-351 ◽  
Author(s):  
C.M. Brenner ◽  
J.S. Green ◽  
A.P.L. Robinson ◽  
D.C. Carroll ◽  
B. Dromey ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Focal Spot ◽  
Laser Pulse Energy ◽  
Laser Energy ◽  
Spot Size ◽  
Proton Flux ◽  
Focal Spot Size ◽  
Order Of Magnitude ◽  
Laser Focal Spot ◽  
Accelerated Protons

AbstractThe scaling of the flux and maximum energy of laser-driven sheath-accelerated protons has been investigated as a function of laser pulse energy in the range of 15–380 mJ at intensities of 1016–1018 W/cm2. The pulse duration and target thickness were fixed at 40 fs and 25 nm, respectively, while the laser focal spot size and drive energy were varied. Our results indicate that while the maximum proton energy is dependent on the laser energy and laser spot diameter, the proton flux is primarily related to the laser pulse energy under the conditions studied here. Our measurements show that increasing the laser energy by an order of magnitude results in a more than 500-fold increase in the observed proton flux. Whereas, an order of magnitude increase in the laser intensity generated by decreasing the laser focal spot size, at constant laser energy, gives rise to less than a tenfold increase in observed proton flux.

Nearly diffraction-limited laser focal spot obtained by use of an optically addressed light valve in an adaptive-optics loop

1998 ◽  
Vol 23 (6) ◽  
pp. 475 ◽  
Author(s):  
J.-C. Chanteloup ◽  
H. Baldis ◽  
A. Migus ◽  
G. Mourou ◽  
B. Loiseaux ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Focal Spot ◽  
Laser Focal Spot ◽  
Light Valve

Effects of the ratio of sphere size to laser focal spot on the dominant in-band EUV emitting region

2009 ◽  
Author(s):  
Sam Yuspeh ◽  
Kevin L. Sequoia ◽  
Yezheng Tao ◽  
Mark S. Tillack ◽  
Russell A. Burdt ◽  
...  
Keyword(s):  
Focal Spot ◽  
Sphere Size ◽  
Laser Focal Spot

Optimization of the size ratio of Sn sphere and laser focal spot for an extreme ultraviolet light source

2008 ◽  
Vol 93 (22) ◽  
pp. 221503 ◽  
Author(s):  
S. Yuspeh ◽  
K. L. Sequoia ◽  
Y. Tao ◽  
M. S. Tillack ◽  
R. Burdt ◽  
...  
Keyword(s):  
Light Source ◽  
Ultraviolet Light ◽  
Focal Spot ◽  
Extreme Ultraviolet ◽  
Size Ratio ◽  
Laser Focal Spot ◽  
Extreme Ultraviolet Light

Optimizing laser focal spot size using self-focusing in a cone-guided fast-ignition ICF target

2021 ◽  
Vol 136 (5) ◽  
Author(s):  
Oriza Kamboj ◽  
Harjit Singh Ghotra ◽  
Vishal Thakur ◽  
John Pasley ◽  
Niti Kant
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
Fast Ignition ◽  
Focal Spot Size ◽  
Self Focusing ◽  
Laser Focal Spot ◽  
Icf Target

Laser focal spot measurements

1975 ◽  
Vol 46 (8) ◽  
pp. 3576-3579 ◽  
Author(s):  
P. J. Brannon ◽  
J. P. Anthes ◽  
G. L. Cano ◽  
J. E. Powell
Keyword(s):  
Focal Spot ◽  
Laser Focal Spot
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