Abstract
We describe an all solid-state (holosteric) laser source which produces subpicosecond pulses at 1.4 μm. The system consists of a diode laser pumped Nd:YAG laser which is frequency modulated (FM) mode locked and Q switched at 1.32 μm. In continuous wave operation the laser produces pulses of 19 ps while simultaneous Q switching and mode locking result in 30 ps pulses being contained in a Q-switched envelope of energy 2.1 μJ. The output of the laser, when passed through a 1 km single-mode optical fiber, produces a spectrally broad Raman signal with its peak at 1.4 μm and the overall conversion efficiency at 12%. The pulse duration at 1.4 μm has been measured to be 280 fs. We believe this is the first time that subpicosecond light pulses have been generated by an all solid-state laser system.
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