scholarly journals TRANSFORMATION CHARACTERISTICS OF LASER BEAM THROUGH A RANDOM PHASE PLATE

1999 ◽  
Vol 48 (10) ◽  
pp. 1891
Author(s):  
XIAO JUN ◽  
LV BAI-DA ◽  
ZHANG BIN
Keyword(s):  
Laser Beam ◽  
Random Phase ◽  
Phase Plate

Laser beam smoothing by rotating random phase plate

1998 ◽  
Author(s):  
Qiang Lin ◽  
Xiaoqing Jiang ◽  
Jingmin Zhu ◽  
Xuanhui Lu ◽  
Shaomin Wang
Keyword(s):  
Laser Beam ◽  
Random Phase ◽  
Phase Plate

Use of a random phase plate as a KrF laser beam homogenizer for thin film deposition applications

1999 ◽  
Vol 70 (4) ◽  
pp. 2116-2121 ◽  
Author(s):  
C. L. S. Lewis ◽  
I. Weaver ◽  
L. A. Doyle ◽  
G. W. Martin ◽  
T. Morrow ◽  
...  
Keyword(s):  
Thin Film ◽  
Laser Beam ◽  
Random Phase ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Phase Plate ◽  
Krf Laser ◽  
Beam Homogenizer

Using a short-pulse diffraction-limited laser beam to probe filamentation of a random phase plate smoothed beam

2008 ◽  
Vol 79 (10) ◽  
pp. 10F551 ◽  
Author(s):  
J. L. Kline ◽  
D. S. Montgomery ◽  
K. A. Flippo ◽  
R. P. Johnson ◽  
H. A. Rose ◽  
...  
Keyword(s):  
Laser Beam ◽  
Short Pulse ◽  
Random Phase ◽  
Phase Plate

Probing of a random phase object by a focused spatially modulated laser beam. Integral scanning method

1999 ◽  
Vol 25 (12) ◽  
pp. 971-973 ◽  
Author(s):  
V. P. Ryabukho ◽  
A. A. Chausskii ◽  
A. E. Grinevich
Keyword(s):  
Laser Beam ◽  
Random Phase ◽  
Phase Object ◽  
Scanning Method

scholarly journals Beam-smoothing effect in broad-band random-phase irradiation

1993 ◽  
Vol 11 (2) ◽  
pp. 385-390 ◽  
Author(s):  
I. Matsushima ◽  
Y. Owadano ◽  
Y. Matsumoto ◽  
I. Okuda ◽  
T. Tomie ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Optical System ◽  
Random Phase ◽  
Broad Band ◽  
Laser Fusion ◽  
Phase Plate ◽  
Smoothing Effect ◽  
Broad Bandwidth ◽  
A New Technique ◽  
Focusing Lens

A new technique to achieve smooth laser irradiation profiles on laser fusion targets is evaluated numerically and experimentally. In this technique, smoothing is obtained by using a spectral dispersing optic and a random-phase plate placed in front of a focusing lens employing the broad-bandwidth of KrF lasers. Experimental results and numerical calculations agree well, verifying that this simple optical system is effective for smooth irradiation on targets.

Laser wander effect in turbulence simulation system with random phase plate

2011 ◽  
Vol 23 (8) ◽  
pp. 2044-2036
Author(s):  
甘新基 Gan Xinji ◽  
郭劲 Guo Jin ◽  
徐抒岩 Xu Shuyan
Keyword(s):  
Random Phase ◽  
Simulation System ◽  
Phase Plate ◽  
Turbulence Simulation

Design and analysis of a novel random phase plate for uniform illumination

1998 ◽  
Author(s):  
Zengshui Liu ◽  
Runwen Wang ◽  
Huijie Huang ◽  
Dunwu Lu
Keyword(s):  
Random Phase ◽  
Phase Plate ◽  
Uniform Illumination

Broadband Random Phase Diffuser for Ultrasonic Imaging

1979 ◽  
Vol 1 (4) ◽  
pp. 325-332
Author(s):  
Gerard A. Alphonse ◽  
David Vilkomerso
Keyword(s):  
Solid Angle ◽  
Random Phase ◽  
Ultrasonic Imaging ◽  
Standing Waves ◽  
Acoustic Imaging ◽  
Point Sources ◽  
Phase Plate ◽  
Reflected Waves ◽  
Large Aperture ◽  
The Waves

In reflective imaging, waves must be scattered by the object over a broad solid angle so that some of the reflected waves impinge upon the collecting aperture. Surfaces such as biological specimens under study in acoustic imaging are considered smooth at the wavelengths used (e.g., 1 mm) and therefore act as specular reflectors. In order to obtain reflection over a broad spatial range, large aperture, sector or compound scanning are used. In certain types of systems, diffuse insonification is sometimes used by imaging a raster of random phase points onto the surface. However interference between the waves from these point sources produces random fringes or “speckle-like” patterns overlaying the image. In optics these fringes have been reduced by rotating the diffuser. A similar approach has been taken here. This paper describes a simple random phase plate having two levels, 0° and 180 phase that can, by rotation, change the relative phases of the diffuse insonification points so as to reduce the speckle-like effect in the image. The temporal bandwidth of the random phase plate is narrow because of standing waves in it. To reduce standing waves the diffuser is intimately coupled to a wedged transducer. This combination is used to obtain diffuse insonification with broad spatial and temporal bandwidth.

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