Abstract
We report random noise pulsed regime of an ytterbium-doped fiber laser arranged in common Fabry-Perot configuration. We show that the laser output obeys the photon statistics inherent to narrowband amplified spontaneous emission and that the noise pulsing is properly addressed in terms of probability density and autocorrelation functions. Our novel approach reveals, in particular, that the regime’s coherence time dramatically shortens, from few ns to tens ps, with increasing laser power.
Highlights
Fiber lasers (FLs) are very attractive devices that found a great number of commercial applications
We presented a study of the noise features of a double-clad ytterbium-doped fiber laser (YDFL) with Fabry-Perot cavity formed by two fiber Bragg gratings
We revealed the following basic results: (i) The YDFL operates in the regime of noise pulses with random magnitudes and widths, on the contrary to what one would expect; width of noise pulses steadily drops with increasing laser power
Summary
Fiber lasers (FLs) are very attractive devices that found a great number of commercial applications. CW double-clad (DC) ytterbium-doped fiber lasers (YDFLs) are featured by excellent power budget, mostly due to the absence of excited state absorption in the system of Yb3+ ions Such lasers when pumped at ~975 nm demonstrate optical efficiency of up to ~80–83%11,12, limited by Stokes-shift loss and, sometimes but not necessarily, by the concentration[13,14] and photodarkening[15,16,17] phenomena. We show that the laser photon statistics depends on laser power (and on laser linewidth) and that its behavior is similar to that of narrowband ASE; some high-amplitude noise events occurring with low probability reach powers more than an order greater than the mean laser power
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