We have fabricated a copper-doped germanium laser using copper diffusion into commercially available pure germanium. The spectrum and the emission pulses of this laser were investigated. Active mode locking was achieved with pulse lengths of 160 ps at full width half maximum. The current Ge:Cu laser does not yet reach the performance of an earlier studied Ge:Ga laser although mode-locked Ge:Cu lasers promise much shorter pulse lengths and wavelength tunable pulses due to the absence of acceptor related absorption. Possibilities to optimize the laser will be discussed.

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