We report an all-fiber, broadband wavelength-tunable, acousto-optic Q-switched ytterbium-doped fiber laser. The tunable lasing operation was achieved by fiber-based acousto-optic tunable filter with a wavelength range spanning to more than 70 nm from 1008.6–1080.3 nm. Pulse shortening is achieved by spectral filtering and reducing the duty cycle of the acousto-optic modulator (AOM) used for Q-switching. At a 345 mW pump power and 1030 nm laser operation, the duration of Q-switched pulses is reduced from 110 ns (without spectral filtering) to 65 ns with 2.2 μ J pulse energy at a 10 kHz repetition rate and 10% duty cycle of AOM. The Q-switched pulse duration is further shortened to ∼10 ns by reducing the duty cycle of AOM to 0.12%. We believe that this all-fiber integrated Q-switched laser system with wide wavelength tunability and shorter duration pulses will be useful in many scientific applications.

中文翻译：

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掺ped全光纤激光器中宽波长可调Q开关脉冲的产生

我们报告了一种全光纤，宽带波长可调，声光调Q掺光纤激光器。可调谐激光操作是通过基于光纤的声光可调谐滤光片实现的，该滤光片的波长范围从1008.6–1080.3 nm超过70 nm。脉冲缩短是通过频谱滤波和减少用于Q开关的声光调制器（AOM）的占空比来实现的。在345 mW的泵浦功率和1030 nm的激光操作下，在10 kHz重复频率和10％占空比的情况下，采用2.2μJ脉冲能量，Q切换脉冲的持续时间从110 ns（无频谱滤波）减少到65 ns。 AOM。通过将AOM的占空比降低到0.12％，将Q开关脉冲持续时间进一步缩短至约10 ns。