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Opt Lett. 2009 Oct 15;34(20):3056-8. doi: 10.1364/OL.34.003056.

Kerr-lens mode-locked femtosecond Cr(2+):ZnSe laser at 2420 nm.

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Department of Physics, Laser Research Laboratory, KoƧ University, Rumelifeneri, Sariyer, 34450 Istanbul, Turkey.


We describe a cw Kerr-lens mode-locked Cr(2+):ZnSe laser pumped by a 1800 nm thulium fiber laser. The astigmatically compensated asymmetric x cavity contained a 2.4-mm-long Cr(2+):ZnSe sample with a pump absorption coefficient of 11.6 cm(-1) and was operated with a 1% output coupler. The dispersion compensation was achieved by using a MgF(2) prism pair. During Kerr-lens mode-locked operation, we could generate 95 fs pulses at a pulse repetition rate of 94.3 MHz and with 40 mW of output power. The center wavelength of the pulses was 2420 nm. The pulses had a spectral width of 69 nm and a time-bandwidth product of 0.335, which is close to the transform limit for hyperbolic secant pulses.

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