Determination of Laser Beam Divergence Using the Acousto-Optic Interaction with Surface Acoustic Waves

1985 ◽  
Author(s):  
T.D. Black ◽  
T. Haghighatjou ◽  
D.A. Larson
Keyword(s):  
Laser Beam ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Beam Divergence ◽  
Acousto Optic Interaction

Determination of crystallographic orientation of large grain metals with surface acoustic waves

2012 ◽  
Vol 132 (2) ◽  
pp. 738-745 ◽  
Author(s):  
Wenqi Li ◽  
Steve D. Sharples ◽  
Richard J. Smith ◽  
Matt Clark ◽  
Michael G. Somekh
Keyword(s):  
Crystallographic Orientation ◽  
Acoustic Waves ◽  
Surface Acoustic Waves

Nondestructive determination of film thickness with laser-induced surface acoustic waves

2018 ◽  
Vol 27 (9) ◽  
pp. 096802 ◽  
Author(s):  
Xia Xiao ◽  
Tao Kong ◽  
Hai Yang Qi ◽  
Hui Quan Qing
Keyword(s):  
Film Thickness ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Nondestructive Determination

VARIATION OF BEAM DIVERGENCE AS A FUNCTION OF DISCHARGE GAP DISTANCE FOR A NITROGEN LASER

2009 ◽  
Vol 23 (11) ◽  
pp. 1457-1466 ◽  
Author(s):  
H. GOLNABI ◽  
M. R. NOURANI
Keyword(s):  
Laser Beam ◽  
Beam Width ◽  
Propagation Distance ◽  
Beam Divergence ◽  
Divergence Angle ◽  
Nitrogen Laser ◽  
Geometrical Method ◽  
Short Side ◽  
Discharge Gap

A simple geometrical method is used here for divergence determination of a TEA N 2 laser. Using beam cross-section (rectangle) monitoring on the fluorescence paper and geometrical method, the laser beam divergence is determined. Variations of the laser beam width (W) and height (H) with respect to the gap distance are investigated for propagation distances of 10, 30, and 50 cm from the laser aperture. For the 0.52 mm gap, the beam width (W) at a distance of 10 cm is about 2 cm and height is also 2 cm (H = 2 cm ), while both increase to about W = 3.125 cm , and H = 2.4 cm at a distance of 50 cm. At 50 cm distance, for a gap distance range of 0.52 mm, W = 3.125, H = 2.4 cm , which increases to W = 18.5 cm , H = 3.6 cm for gap distances of 1.3 mm. Variations of the defined aspect ratio (H/W) as a function of electrode separation and beam propagation distance are also investigated. Variation of the divergence angle along the short and long side of the rectangular beam is investigated. The divergence angle along the long side for the 0.52 mm gap is about 0.0281 rad, and increases with gap value, and for the 1.3 mm gap is 0.284 rad, corresponding to an average divergence of 0.156 rad in this range. The average divergence in the short side is about 0.01 rad, which is much smaller than the divergence angle along the long side (0.156 rad). This study shows that the discharge gap distance, in addition to its important role in N 2 laser output power, it also plays an important role in the beam divergence, especially in the horizontal plane.

Mechanical Property Determination of Thin Porous Low-kFilms by Twin-Transducer Laser Generated Surface Acoustic Waves

2004 ◽  
Vol 43 (2) ◽  
pp. 508-513 ◽  
Author(s):  
Xia Xiao ◽  
Nobuhiro Hata ◽  
Kazuhiro Yamada ◽  
Takamaro Kikkawa
Keyword(s):  
Mechanical Property ◽  
Acoustic Waves ◽  
Surface Acoustic Waves

Acousto-optic interaction with leaky surface acoustic waves in Y-cut LiTaO3 crystals

Ultrasonics ◽  
2012 ◽  
Vol 52 (5) ◽  
pp. 593-597 ◽  
Author(s):  
Jaroslavas Belovickis ◽  
Romualdas Rimeika ◽  
Daumantas Čiplys
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Acousto Optic Interaction
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