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Phys Rev Lett. 2002 Apr 15;88(15):153901. Epub 2002 Apr 1.

Conical harmonic generation in isotropic materials.

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School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.


A novel class of nonlinear optical processes is described in which radiation at the nth harmonic is generated through the use of a (2n+1)-order nonlinearity. Utilizing an odd-order nonlinearity, this process allows for the generation and amplification of both odd- and even-order harmonics in isotropic materials. Additionally, this process can always be phase matched in normal-dispersion materials without the use of birefringence. Experimental results are presented in which conical third-harmonic emission is generated from a sapphire sample.

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