Abstract
We propose a novel laser configuration that can output 3.5- $\mu$ m nanosecond laser pulses based on a simple and monolithic fiber structure. Cascade-gain-switching (CGS) converts the wavelength of nanosecond pulses from 1.55 to 3.5 $\mu$ m by two successive gain-switching processes. CGS eliminates the requirement of using bulky free-space modulators for Q-switching. With a well-established theoretical model, we investigated the feasibility of this novel configuration and thoroughly explored its characteristics. In single-shot regime, the pulse width of the 1.55- $\mu$ m pump has major impact on the temporal shape of the intermediate 1.97- $\mu$ m pulse while has neglected influence on the generated 3.5- $\mu$ m pulse. On the other hand, increasing the continuous-wave (CW) pump power can significantly improve the output peak power and shorten the pulse when the pump power is less than $\sim 4$ W. In the repetitive-pulse regime, we found the maximum repetition rate is positively correlated the CW pump power. With a typical CW pump power of 5 W, the 3.5- $\mu$ m pulse train can be stably outputted when the repetition rate is $ kHz.
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