Abstract

The optical gain is measured in Perylene Red (PR)-doped polymethyl methacrylate (PMMA) slabs for copropagating and transverse pumping configurations based on a single-pass pump–probe method where a small signal is used as a probe beam. The gain is characterized in terms of the stimulated gain coefficient ($g_S$) for both pump configurations. This material property determines the strength of pump absorption and coupling to the probe signal beam through stimulated emission. For copropagating pumping, $g_S$ was found to be $(3.05\pm 0.17)\times {10}^{-3}\mathrm{m}/\mathrm{W}$ for $\sim 0.05\mathrm{mM}$ PR-doped PMMA using a 633 nm probe laser, pumping with a 532 nm CW laser. For transverse pumping, $g_S$ was found to be $(3.28\pm 0.09)\times {10}^{-3}\mathrm{m}/\mathrm{W}$ for a $\sim 0.15\mathrm{mM}$ sample. The small difference in the gain coefficient is attributed to the difference in concentration. The stimulated gain coefficient, a material property of the gain medium independent of the pump configuration and experimental setup, offers a useful and convenient way to characterize the optical gain for solid-state lasers or amplifiers.

© 2015 Optical Society of America

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