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Passive Q-switch performance at 1.3 µm (1.5 µm) and nonlinear spectroscopy of Co2+:MgAl2O4 and Co2+:LaMgAl11O19 crystals

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Abstract

Passive Q-switching of a 1.34 µm Nd3+:YA1O3 laser and a 1.54 µm Er3+:glass laser using Co2+:MgAl2O4(Co2+:MALO) and Co2+:LaMgAl11O19(Co2+:LMA) crystals as saturable absorbers are demonstrated. Q-switched laser pulses of 110 ns (75 ns) in duration and up to 10 m J (3.8 m J) energy at 1.34 µm and 56 ns (40 ns) in duration and up to 2.7 mJ (4.5 mJ) in energy at 1.54 µm were obtained for the Co2+:MALO(Co2+:LMA) crystals. Using the Co2+:MALO as saturable absorber, mode-locked 1.34 µm Nd3+:YA1O3 laser single pulses were obtained to be ~300 ps duration and up to 0.2 mJ energy. Differential absorption spectra recorded with picosecond pump-probe technique and absorption saturation of the Co2+:MALO and Co2+:LMA crystals are investigated.

© 1999 Optical Society of America

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