An antiguide structure for enhanced second-harmonic generation was actively constructed in a photorefractive polymer by use of a pump beam. Irradiation of a pump beam enhanced second-harmonic power, and blocking the pump returned the power to the initial value. The electric-field dependence of the degree of enhancement of the second-harmonic power confirmed that the antiguide structure was constructed through a photorefractive-index change in the medium. The photorefractive-index change accompanied molecular reorientation induced by the pump-generated space charges. The thermo-optic effect on formation of the structure is also discussed.
© 2001 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.5330) Nonlinear optics : Photorefractive optics
(190.5940) Nonlinear optics : Self-action effects
(250.5460) Optoelectronics : Polymer waveguides
Takafumi Sassa, Tatsuo Wada, Hiroyuki Sasabe, Masaaki Yokoyama, and Shinsuke Umegaki, "Active formation of an antiguide structure in a photorefractive polymer for enhanced second-harmonic generation," Opt. Lett. 26, 995-997 (2001)