Title

Self-Focusing And Self-Defocusing By Cascaded Second-Order Effects In Ktp

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 n2eff≅±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 0eff2 scales linearly with length and as 0eff2; however, for the maximum n2eff the nonlinear phase distortion becomes sublinear with irradiance for phase shifts near π/4. © 1992 Optical Society of America.

Publication Date

1-1-1992

Publication Title

Optics Letters

Volume

17

Issue

1

Number of Pages

28-30

Document Type

Article

Identifier

scopus

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OL.17.000028

Socpus ID

84975560939 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84975560939

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