We propose a compact all fiber Yb-doped rectangular burst-mode laser with high inter-burst repetition rate (~MHz) and high intra-burst repetition rate (~GHz). In this burst-mode fiber laser, the dissipative soliton resonance (DSR) passive mode-locked laser is employed to generate tunable rectangular burst-mode pulse while combining with active modulator (Electro-Optic Modulator, EOM). Tunable burst-mode pulse is achieved includes 5-10 ns of tunable burst duration, 0.8- 1.5 GHz of adjustable intra-burst repetition rate and tunable intra-burst duty cycle. The inter-burst repetition rate is 1.58 MHz. This system combing with such parameters can be employed to generate ultra-high repetition rate microwave signal at high frequency band.
We reported the first erbium-doped ZBLAN fiber MOPA system centered at 2789 nm. The master oscillator was a passively mode-locked ZBLAN fiber laser based on a semiconductor saturable absorber mirror in a linear cavity. The pulse repetition rate was measured as 15.3 MHz with a signal-to-noise ratio of 62 dB, which indicating stable mode-locking operation. Then a one-stage Er3+-doped ZBLAN fiber amplifier was used to boost the average output power after a polarization dependent isolator. The maximum output power of 0.7 W was measured at the end of the amplifier with a slope efficiency of 25%. And the width of 3 dB spectrum was 4.5 nm from 2787.5 nm to 2792 nm.
A strictly-all-fiberized 2 to 5 μm supercontinuum (SC) laser source with high conversion efficiency is demonstrated. A broadband thulium-doped fiber amplifier with spectral coverage of 2-2.7 μm is used to pump a piece of single-mode fluoroindate (InF3) fiber. A fusion spliced joint with loss down to 0.07 dB is achieved between a piece of silica fiber and the InF3 fiber, which keeps all-fiber structure and efficient pump power coupling. A 1.35-W SC with spectral coverage of 1.5-5.2 μm is obtained with a record power conversion efficiency of 59.5%. This research, to the best of the authors' knowledge, demonstrates the first all-fiber-integrated of InF3-fiber-based MIR-SC laser sources to date.
For pulsed fiber amplifiers with repetition rate of tens of kHz, inter-pulse amplified spontaneous emission (ASE) is easy to build up and makes it difficult to amplify the weak signal effectively. Besides, amplified pulse shape of several tens of nanosecond would distort because of the dynamic gain saturation effect. In this paper, we demonstrate a polarization-maintained fiber laser system with three-stage amplifiers delivering pulse energy up to 70 μJ. The whole system is seeded by a semiconductor diode laser with central wavelength of 1063.9 nm and pulse repetition rate of 10 kHz which is driven directly by an arbitrary waveform electrical signal. We experimentally optimized the gain fiber length of the first-stage amplifier based on the reabsorption effect. The signal amplification efficiency and ASE proportion with different pump schemes in the first amplifier were investigated and compared in detail. Finally, an amplified pulse with 70 μJ energy accompanying with serious shape distortion was experimentally demonstrated. The signal to ASE ratio is as high as 54 dB from spectrum and the overall energy gain is 30 dB. Furthermore, a rectangular pulse with energy of 50 μJ was achieved by pre-compensating the shape distortion using the stochastic parallel gradient descent (SPGD) algorithm and the total energy gain is 28.5 dB.
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