Abstract
Mode-locked solid-state oscillators operating in the normal dispersion regime provide generation of broadband energy scalable chirped pulses. Lasers operating in the mid-infrared “finger-print” wavelength region of molecular vibrations (above 2 µm) are particularly attractive for such important applications as optical metrology, spectroscopy, environmental and industrial monitoring [1,2]. As the relative contribution of higher-order dispersions increases with the wavelength, the so-called chaotic mode-locking [3,4] becomes an issue especially for the mid-IR oscillators. The analogue for a fibre oscillator is the regime of noiselike pulse generation followed by irregular sub-structuring of a time-localized pulse [5]. In the present study, we demonstrate that the source of chaotic mode-locking in a solid-state oscillator results from a parametric resonance with dissipative waves, as opposed to the negative feedback caused by the increased the pulse power in fibre lasers [6].
© 2011 Optical Society of America
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