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Optics Letters

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  • Vol. 17, Iss. 1 — Jan. 1, 1992
  • pp: 28–30

Self-focusing and self-defocusing by cascaded second-order effects in KTP

R. DeSalvo, D. J. Hagan, M. Sheik-Bahae, G. Stegeman, E. W. Van Stryland, and H. Vanherzeele  »View Author Affiliations


Optics Letters, Vol. 17, Issue 1, pp. 28-30 (1992)
http://dx.doi.org/10.1364/OL.17.000028


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Abstract

We monitor the induced phase change produced by a cascaded χ(2):χ(2) process in KTP near the phase-matching angle on a picosecond 1.06-μm-wavelength beam using the Z-scan technique. This nonlinear refraction is observed to change sign as the crystal is rotated through the phase-match angle in accordance with theory. This theory predicts the maximum small-signal effective nonlinear refractive index of n 2 eff ± 2 × 10 14 cm2/W (±1 × 10−11 esu) for an angle detuning of ±5° from phase match for this 1-mm-thick crystal with a measured deff of 3.1 pm/V For a fixed phase mismatch, this n 2 eff scales linearly with length and as deff2; however, for the maximum n 2 eff the nonlinear phase distortion becomes sublinear with irradiance for phase shifts near π/4.

© 1992 Optical Society of America

History
Original Manuscript: August 9, 1991
Published: January 1, 1992

Citation
R. DeSalvo, H. Vanherzeele, D. J. Hagan, M. Sheik-Bahae, G. Stegeman, and E. W. Van Stryland, "Self-focusing and self-defocusing by cascaded second-order effects in KTP," Opt. Lett. 17, 28-30 (1992)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-17-1-28


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