Abstract
Illuminating a Ge-doped fiber with both infrared and doubled-infrared (green) light beams can transform the to a frequency doubler.1,2 Measurements of the phase Δϕ between the green light that induces the nonlinearity and the green light produced by the glass frequency doubler reveal a value of Δϕ ≈ −90° (Ref. 3). At first glance, Δϕ = −90° is precisely the wrong value to allow a self- seeding process to bootstrap and grow in strength. In this work we measure the time evolution of the phase and the intensity of the second-harmonic light produced by the glass fiber, and we show that, even with an initial phase shift near −90°, a very weak initial green seeding beam can nevertheless grow in time and induce an efficient nonlinearity in the glass fiber.
© 1995 Optical Society of America
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