Abstract
In this paper, we report, for the first time, that by modulating pump beam to suppress ASE effect we realized ultra-low repetition rate output in an all fiber based Er:Yb codoped master oscillator power amplifiers (MOPA) system. Combined with pulse shaping technology, pulses with up to 205 µJ pulse energy and 200 ns pulse duration were obtained at Hz level.
Highlights
High energy pulsed fiber lasers have been considered as an enabling technology with many applications, such as laser sensing, laser imagery coherent Lidar, holography, free space optical communications, and material processing due to their many advantages such as compact, light-weight and high wall-plug efficiency [1,2,3,4,5,6,7,8]
We report, for the first time, that by modulating pump beam to suppress amplified spontaneous emission (ASE) effect we realized ultra-low repetition rate output in an all fiber based Er:Yb codoped master oscillator power amplifiers (MOPA) system
We obtained pulse energy of 205 μJ at ultra low repetition rates (
Summary
High energy pulsed fiber lasers have been considered as an enabling technology with many applications, such as laser sensing, laser imagery coherent Lidar, holography, free space optical communications, and material processing due to their many advantages such as compact, light-weight and high wall-plug efficiency [1,2,3,4,5,6,7,8]. In eye safe wind-profiling Lidar applications, 200 ns pulse width is required at low repetition rate down to Hz level. Due to amplified spontaneous emission (ASE) effect and the gain dynamics in Er-doped fiber lasers, the repetition rate is limited to kHz [6,7,8,9]. In recent publication we demonstrated a 10 kHz repetition rate, 130 μJ pulse energy at a wavelength of 1.5 μm with a pulse width of 200 ns [11]. We have succeeded in generating 200 ns pulses with pulse energy of 240 μJ at 100 Hz and 205 μJ at Hz level To our knowledge, this is the highest pulse energy from an all fiber based 1.5 μm laser at such a low repetition rate
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