We report a 2 μm ultrafast solid-state laser, mode-locked by single-layer graphene, generating transform-limited pulses, with a spectral width at 2067 nm. The maximum average output power is 270 mW, at a pulse repetition frequency of 110 MHz. This is a convenient high-power transform-limited ultrafast laser at 2 μm for various applications, such as laser surgery and material processing.
Received 25 October 2012Accepted 17 December 2012Published online 10 January 2013
We acknowledge funding from the ERC grant NANOPOTS, EU grants RODIN, MEM4WIN, GENIUS, EPSRC grants EP/GO30480/1 and EP/G042357/1, King's College Cambridge, the Royal Academy of Engineering, a Royal Society Wolfson Research Merit Award, and the Cambridge Nokia Research Centre.
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