Abstract
We report the first to our knowledge high-energy graphene mode-locked solid-state laser operating in the positive dispersion regime. Pulses with 15.5 nJ energy and 42 nm spectral bandwidth with 0.87 ps duration were obtained at 2.4 μm wavelength. The output can be compressed down to 189 fs. The graphene absorber damage threshold was established at fluence approaching 1 mJ/cm².
Highlights
Monolayer graphene is a unique material possessing unique optical properties, allowing it to act as a wavelength-independent saturable absorber with very fast decay times, perfectly suitable to initiate the mode-locked operation of ultrafast solid-state lasers
We report the first to our knowledge high-energy graphene mode-locked solid-state laser operating in the positive dispersion regime
Pulses with 15.5 nJ energy and 42 nm spectral bandwidth with 0.87 ps duration were obtained at 2.4 μm wavelength
Summary
Monolayer graphene is a unique material possessing unique optical properties, allowing it to act as a wavelength-independent saturable absorber with very fast decay times, perfectly suitable to initiate the mode-locked operation of ultrafast solid-state lasers. That could be done by using the technique of chirped-pulse-oscillator (CPO or ‘dissipative soliton’) that allows reducing the intracavity pulse peak power, while retaining the possibility of extracavity recompression of the pulse back to sub-100-fs level. This technique is well-established in fiber [4] and Ti-sapphire lasers [5,6], and has recently been demonstrated with the Cr:YAG [7] and Yb-doped thin-disk lasers [8,9]. Implementing of the graphene saturable absorber to such a system would allow unleashing the potential of the chirped pulse oscillator concept towards easy pulse energy scaling in the wide range
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