Low repetition-rate and long pulse-duration laser around 2 μm has been investigated and widely used in deep space exploration, thanks to its high single pulse energy, low atmospheric loss, and safety to human eyes. This paper briefly summarizes the investigations of kilohertz and nanosecond laser around 2 μm, in terms of three pulse modulation techniques. In particular, the discussion of the advantages and disadvantages of the three pulse modulation techniques can further promote the development of the deep space exploration in China.
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