Abstract
We present a detailed study on the generation of widely tunable visible light through four wave mixing in specifically designed micro-structured fibers. The fiber's properties are optimized for an efficient conversion to the visible and near infrared with a combined tunability from 620 to 910 nm of a picosecond Yb-doped tunable source for biomedical applications.
Highlights
Tunable coherent light sources emitting ultrashort pulses in the visible draw a considerable attention due to the increasing number of emerging applications in the academic, industrial as well as biomedical domains [1, 2]
While all the results presented here were obtained at 10 MHz, the repetition rate of our source has wide excursion from 5 MHz to 1 GHz not compatible with fiber optical parametric oscillator architectures that operate at rather fixed repetition rates
Beyond the fundamental aspect of FWM, we present a detailed study of designed air-silica fibers to optimally map the large tuning range of the Yb-doped fiber pump laser onto the visible where such a source may find important applications
Summary
Tunable coherent light sources emitting ultrashort pulses in the visible draw a considerable attention due to the increasing number of emerging applications in the academic, industrial as well as biomedical domains [1, 2]. Considering the advantages and drawbacks of each of these processes, d-FWM emerges as the most appropriate effect for the efficient conversion of near IR moderately intense laser sources with high average power towards widely tunable short and intense pulses in the visible. The latter phenomenon constitutes a viable alternative to laser emission as powerful, stable and compact driving sources can achieve high nonlinear conversion yield [9].
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