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Refractive index changes induced by pump-signal operation in commercial Yb-doped fibers are shown to be of electronic origin with a strong contribution of UV-transitions to the polarizability difference explored for testing wavelength of 1460-1620 nm.
Single mode oscillation in a 200 mum core diameter gain guided index anti-guided fiber laser is demonstrated. Single mode oscillation is maintained for pumping of up to four times laser threshold, limited by available pump power.
Using pump-probe imaging techniques we monitor the formation of plasma strings, the subsequent emergence of transient electronic defects, and their transformation to permanent refractive index modifications in fused silica following sub-picosecond ultraviolet laser pulse filamentation.
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