Submillisecond pulses by two-wave coupling in Bi12TiO20 crystals

摘要

We experimentally observed the unusually fast response in a two-wave mixing arrangement with fiber-like Bi$-12$/TiO$- 20$/ crystals on transient change of the external electric field. Pulses of the amplification of the signal wave with a rise time down to 0.2 ms and a width of 0.5 ms at a total input intensity of 6 mW/mm$+2$/ are obtained when applying a rising or decreasing front of an external electric field to the crystal. The two-wave coupling without external field has a response time of 200 ms.