• Infrared and Laser Engineering
  • Vol. 44, Issue 11, 3234 (2015)
Qi Gang1、*, Xiong Shuidong1, Liang Xun1, and Lin Huizu2
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: Cite this Article
    Qi Gang, Xiong Shuidong, Liang Xun, Lin Huizu. High-performance and narrow line-width nanosecond pulse laser amplifier for weak signal[J]. Infrared and Laser Engineering, 2015, 44(11): 3234 Copy Citation Text show less

    Abstract

    A single mode, linearly polarized, narrow line-width, nanosecond pulsed fiber laser in master oscillator power amplifier(MOPA) configuration was demonstrated and the experimental results agreed with the theory. A single-frequency continuous wave laser operating at 1 064 nm was modulated by an acousto-optic modulator(AOM) to obtain pulses as the seed of the master amplifier. The repetition rate of the pulsed seed was 50 kHz and the average power was 25 μW. In the pre-amplification stage, the effect of nonlinear effect, amplified spontaneous emission(ASE), parasitic lasing and pump saturation were analyzed by simulation. By optimizing the parameters of the MOPA system, the parasitic lasing was suppressed and the enlargement factor was increased effectively. In the experiment, the laser with pulse width of 64 ns and average power of 75 mW was achieved. Finally, the key factors that affect the performance of the sub-milli-watt weak signal amplifier were discussed.
    Qi Gang, Xiong Shuidong, Liang Xun, Lin Huizu. High-performance and narrow line-width nanosecond pulse laser amplifier for weak signal[J]. Infrared and Laser Engineering, 2015, 44(11): 3234
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