The polarization self-modulation effect was applied for effective measurement of the characteristic response time of nominally pure Bi<sub>12</sub>SiO<sub>20</sub> (BSO) at wavelengths of 810 and 980 nm. Owing to oxygen deficiency in the crystal lattice, the BSO crystals showed unusual photorefractive sensitivity and remarkable operation speed in the near-infrared spectral region. A response time of 130 ms was measured at 810 nm, and a response time of 540 ms was measured at 980 nm, with incident intensities of 110 and 200mW/cm<sup>2</sup>, respectively. To our knowledge, this is the first experimental evidence of a subsecond response in the infrared for a nonsemiconductor photorefractive material.
© 2000 Optical Society of America
Erik Raita, Oleg Kobozev, Alexei A. Kamshilin, and Victor V. Prokofiev, "Fast photorefractive response in B12SiO20 in the near infrared," Opt. Lett. 25, 1261-1263 (2000)