Dynamic gratings of the quadratic polarizability in polydiacetylene PTS
Vinogradov G. A. , Zel'dovich B. Ya., Kotegov A. M., Chudinov A. N.
A single crystal of polydiacetylene PTS was exposed to (E3)-coherent picosecond pulses (Λω=1.06 μηι) and second-harmonic pulses (Λ2ω=0.53 μπι), which met at an angle 0=4 X 10"3 rad. The observed diffraction of the λω beam through angles — 0, — 30, and —50 is interpreted in terms of the writing of a grating of the quadratic polarizability and the subsequent generation of a 2ύ>—со signal at this grating.
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![](/ps/1290/article_19497_800_head.png "A single crystal of polydiacetylene PTS was exposed to (E<sup>3</sup>)-coherent picosecond pulses (Λ<sub>ω</sub>=1.06 μηι) and second-harmonic pulses (Λ<sub>2ω</sub>=0.53 μπι), which met at an angle 0=4 X 10"<sup>3</sup> rad. The observed diffraction of the <i>λ<sub>ω </sub></i>beam through angles — 0, — 30, and —50 is interpreted in terms of the writing of a grating of the quadratic polarizability and the subsequent generation of a 2ύ><b>—</b><i>со </i>signal at this grating.")