Abstract

Phase conjugation of multicolor beams has been reported by others.¹ Here we report color-selective self-pumping when a multicolor beam from an argon-ion laser with an all-line mirror is incident on an electrically poled barium titanate crystal. If the intensity of the incident beam A₁ < 25 mW, the self-pump A₁ is blue (4880 Å). If the intensity is increased beyond 25 mW, A₁ changes from blue to green slowly (approximately several seconds) with both blue and green seen for a short time, after which the blue signal decays to zero. A second multicolor beam A₂ (30 mW), crossing A₁ in the crystal and individually (without A₁) self-pumping in the green, can control the color of A₁. If initially A₁ is blue, and A₂ is put on, A₂ also self-pumps but in blue. A₁, along with A₂, gradually changes to green, with both of them showing both blue and green for a few seconds.

© 1989 Optical Society of America