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We experimentally observe two independent terahertz sources with different peak frequencies emitted from a femtosecond laser pulse induced air filament when the filament splits into two sub-filaments. The frequency of terahertz waves from the trailing sub-filament is higher than that from the leading sub-filament.
Resonantly pumped by a 1.914-μm Q-switched Tm:YLF laser, high-peak-power stable laser pulse from gain-switched ~1.94-μm Tm3+-doped silica fiber lasers are reported for the first time. The slope efficiency was over 80% with respect to absorbed pump power, and chaotic spiking was effectively eliminated by using fast gain switching. With a 4-m Tm3+ fiber, pulse energy of 1.3 mJ and pulsewidth of 61 ns...
A 4D thermal model was established with the finite element analysis to numerically simulate the temperature variation in the gain medium of pulsed and end-pumped laser. Two possible methods were proposed to compensate the thermal effect.
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