Measurement of complex χ(3) using degenerate four-wave mixing with an imaged 2-D phase grating

Shuo Yen Tseng, Weilou Cao, Yi Hsing Peng, Joel M. Hales, San Hui Chi, Joseph W. Perry, Seth R. Marder, Chi H. Lee, Warren N. Herman, Julius Goldhar

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We present a simple optical arrangement for phase sensitive detection of degenerate four-wave mixing (DFWM) to characterize the real and imaginary parts of χ(3) using an imaged 2-D phase grating. Phase sensitive coherent detection of DFWM signal is demonstrated. Phase stabilization of the interferometric arms is obtained passively with the 2-D grating. A processable polyacetylene sample is characterized at a wavelength of 1.5 μm using this technique. The observed nonlinearity is determined to be a fast (<250 fs) effect using a simple test.

Original languageEnglish
Pages (from-to)8737-8744
Number of pages8
JournalOptics Express
Issue number19
Publication statusPublished - 2006

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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