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Title: Microsecond gain-switched master oscillator power amplifier (1958 nm) with high pulse energy

An all-fibre master oscillator power amplifier (MOPA) emitting high-energy pulses at 1958 nm is presented. The seed laser is a microsecond gain-switched thulium-doped fibre laser (TDFL) pumped with a commercial 1550-nm pulsed fibre laser. The TDFL operates at a repetition rate f in the range of 10 to 100 kHz. The two-stage thulium-doped fibre amplifier is built to scale the energy of the pulses generated by the seed laser. The maximum output pulse energy higher than 0.5 mJ at 10 kHz is achieved which is comparable with the theoretical maximum extractable pulse energy. The slope efficiency of the second stage amplifier with respect to the pump power is 30.4% at f = 10 kHz. The wavelength of the output pulse laser is centred near 1958 nm at a spectral width of 0.25 nm after amplification. Neither nonlinear effects nor significant amplified spontaneous emission (ASE) is observed in the amplification experiments. (lasers)
Authors:
; ; ; ;  [1]
  1. College of Opto-electric Science and Engineering, National University of Defense Technology, Changsha 410073, Hunan (China)
Publication Date:
OSTI Identifier:
22373589
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DOPED MATERIALS; EFFICIENCY; KHZ RANGE 01-100; LASERS; NEAR INFRARED RADIATION; NONLINEAR PROBLEMS; OSCILLATORS; PHOTON EMISSION; POWER AMPLIFIERS; PULSES; SWITCHES; THULIUM