Phys. Rev. A 18, 2592–2602 (1978)Laser studies of internal conical diffraction. III. Second-harmonic conical refraction in α-iodic acidReceived 10 April 1978; published in the issue dated December 1978 The phenomenon of nonlinear conical refraction in a noncentrosymmetric biaxial crystal is investigated experimentally. Both free and forced second-harmonic cones are observed, depending on whether the incident laser pulse has wave normals encompassing the optic axis at the second-harmonic or the fundamental frequency, respectively. The photographically recorded second-harmonic intensity patterns at the wavelengths of 0.53 and 0.42 μm are in good agreement with theoretical predictions. © 1978 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.18.2592
DOI:
10.1103/PhysRevA.18.2592
PACS:
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