Two Photon and Two-Step Absorption in Glass Optical Waveguide
We have observed a variety of phenomena in studies of two photon effects in glass optical waveguides. The long interaction lengths in fibers provide great sensitivity to weak effects so that these techniques are applicable to low-loss fibers. The procedure is to monitor the absorption of a weak CW probe during and after a strong pulse at a different wavelength. In general two-step absorption is observed with decay times of about 10μs. Simultaneous two photon absorption, bleaching and saturation effects are also observed.
KeywordsPump Power Pump Pulse Photon Absorption Probe Power Fiber Optical Waveguide
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