Internal conical refraction of elastic waves in orthorhombic crystals

1973 ◽  
Vol 77 (5) ◽  
pp. 201-211
Author(s):  
S. R. Prabhakaran Nayar
Keyword(s):  
Elastic Waves ◽  
Conical Refraction ◽  
Internal Conical Refraction ◽  
Orthorhombic Crystals

Internal conical refraction of Bessel light beams

2002 ◽  
Vol 92 (3) ◽  
pp. 455-458 ◽  
Author(s):  
A. M. Bel’skiĭ ◽  
M. A. Stepanov
Keyword(s):  
Conical Refraction ◽  
Internal Conical Refraction ◽  
Light Beams ◽  
Bessel Light Beams

scholarly journals Conical diffraction: observations and theory

2006 ◽  
Vol 462 (2070) ◽  
pp. 1629-1642 ◽  
Author(s):  
M.V Berry ◽  
M.R Jeffrey ◽  
J.G Lunney
Keyword(s):  
Laser Beam ◽  
Dimensionless Parameter ◽  
Incident Beam ◽  
Asymptotic Limit ◽  
Biaxial Crystal ◽  
Conical Refraction ◽  
Dark Ring ◽  
Internal Conical Refraction

Conical refraction was produced by a transparent biaxial crystal of KGd(WO 4 ) 2 illuminated by a laser beam. The ring patterns at different distances from the crystal were magnified and projected onto a screen, giving rings whose diameter was 265 mm. Comparison with theory revealed all predicted geometrical and diffraction features: close to the crystal, there are two bright rings of internal conical refraction, separated by the Poggendorff dark ring; secondary diffraction rings decorate the inner bright ring; as the distance from the crystal increases, the inner bright ring condenses onto an axial spot surrounded by diffraction rings. The scales of these features were measured and agreed well with paraxial theory; this involves a single dimensionless parameter ρ 0 , defined as the radius of the rings emerging from the crystal divided by the width of the incident beam. The different features emerge clearly in the asymptotic limit ρ 0 ≫1; in these experiments, ρ 0 =60.

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