Abstract

Yttrium aluminum garnet (YAG) is a common host material for both bulk and single-crystal fiber lasers. With increasing interest in developing optical technologies in the short-wave infrared and mid-infrared wavelength range, YAG may be a potential supercontinuum medium for these applications. Here, we characterize femtosecond laser pumped supercontinuum generation with 1200–2000 nm pump wavelengths (${\lambda _{p}}$) for undoped, single-crystal YAG fibers, which are representative of the normal, zero, and anomalous-dispersion regimes. Supercontinuum was observed over the spectral region of about 0.2 to $1.6{\lambda _{p}}$. Z-scan measurements were also performed of bulk YAG, which revealed little dispersion of the nonlinear index of refraction (${{n}_2}$) in the region of interest. The measured values of ${{n}_2}$ (${\sim}1 \times {10^{- 6}} \;{\rm{cm}}^2/{\rm{GW}}$) indicate a regime in which the nonlinear length, ${L_{{\rm{NL}}}}$, is less than the dispersion length, ${L_{D}}$, (${L_{{\rm{NL}}}} \ll {L_{D}}$). We report intensity clamping of the generated filament in the normal group velocity dispersion (GVD) regime and an isolated anti-Stokes peak in the anomalous GVD regime, suggesting further consideration is needed to optimize supercontinuum generation in this fiber medium.

© 2021 Optical Society of America

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