Abstract
We demonstrate the improved second-harmonic Talbot self-imaging through the quasi-phase-matching technique in a 2D periodically-poled LiTaO(3) crystal. The domain structure not only composes a nonlinear optical grating which is necessary to realize nonlinear Talbot self-imaging, but also provides reciprocal vectors to satisfy the phase-matching condition for second-harmonic generation. Our experimental results show that quasi-phase-matching can improve the intensity of the second-harmonic Talbot self-imaging by a factor of 21.
Highlights
The Talbot effect, i.e. a self-imaging phenomenon of a periodic structure in the Fresnel nearfield, holds various applications in imaging process and synthesis, photolithography, optical testing, as well as Talbot illuminator [1, 2]
We demonstrate the improved second-harmonic Talbot selfimaging through the quasi-phase-matching technique in a 2D periodicallypoled LiTaO3 crystal
Our experimental results show that quasiphase-matching can improve the intensity of the second-harmonic Talbot self-imaging by a factor of 21
Summary
The Talbot effect, i.e. a self-imaging phenomenon of a periodic structure in the Fresnel nearfield, holds various applications in imaging process and synthesis, photolithography, optical testing, as well as Talbot illuminator [1, 2]. The prerequisite condition to realize self-imaging is fulfilled by the periodic distribution of the second-order nonlinear coefficients (χ(2)) in the PPLT crystal rather than the refractive index (n). Potential applications of such nonlinear Talbot effect include noninvasive imaging of domain structures and high-resolution lithography. The produced nonlinear Talbot image has a low intensity due to phasemismatching, which impedes the further applications of such interesting phenomenon
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