Abstract
We report for the first time, to the best of our knowledge, graphene mode-locked operation of a femtosecond Alexandrite laser at 750nm. A multipass-cavity configuration was employed to scale the output energy and to eliminate spectral/Q-switching instabilities. By using a monolayer graphene saturable absorber, mode locking could be obtained. With 5W of pump at 532nm, nearly transform-limited, 65fs pulses with a time-bandwidth product of 0.319 were generated. The mode-locked laser operated at a pulse repetition rate of 5.56MHz and produced 8mW output power, corresponding to a pulse energy and peak power of 1.4nJ and 22kW, respectively. These experiments further show that graphene can be used to initiate mode locking at wavelengths as low as 750nm.
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