Most of the FBGs used in continues-wave thulium-doped fiber lasers are made in foreign companies. So we built up a fiber Bragg grating (FBG) writing platform to produce different parameter FBG for research, and a homemade FBG-based thulium-doped fiber laser testing system was experimentally demonstrated in this paper. Here homemade uniform FBGbased thulium fiber laser output characteristic was explored. The thulium-doped fiber laser was built up with two 793nm laser diodes as pump source, a thulium-doped fiber, a combiner and a pair of homemade FBGs. A 1916 nm thulium-doped fiber laser with output power of 20.87 W and slope efficiency of 41.29% and a 1917 nm thulium-doped fiber laser with output power of 19.53 W and slope efficiency of 38.56% were obtained by optimizing the thulium-doped fiber length, the operation temperature of the grating and the center wavelength of the grating.
We demonstrated a stable fiber laser setup for real-time monitoring of Tm-doped gain fibers while being exposed to gamma-rays. The output power is about 10W, and the power stability of the system is ±0.25% based on the 12-hour continuous measurement. By using this laser setup and 60Co gamma-ray irradiation source, the dose rate effect and total dose effect on the typical Tm-doped fiber specimens under water-cooling condition were experimentally studied. According to the obtained experimental results on five kinds of Tm-doped gain fiber from different R and D institutions and batches at home and abroad, the output power declines monotonously with the total irradiation dose increasing. During a dose rate range of 0.05 to 0.5 rad(Si)/s, the dose rate effects of Tm-doped gain fiber samples basically disappear, which means the differences of power degradation under different dose rate are almost invisible.
We report a 2 μm band high power pulsed all-polarization maintaining (PM) thulium-doped fiber laser based on the acousto-optic q-switching technique. It is constructed in a two-stage master-oscillator power amplifier (MOPA) configuration. A Q-switched seed laser was composed of a homemade 1559 nm fiber laser, a pair of fiber Bragg gratings (FBGs) with central wavelength at 2009 nm, a piece of single-cladding thulium-doped fiber (TDF) and an acoustic-optical modulator (AOM). Using a two-stage amplifier seeded by an acousto-optic modulator modulated pulsed laser, We achieved the laser with a central wavelength of 2009.71 nm, and the laser has a 3 dB linewidth of 0.09nm and output power of approximately 2.04 W. Based on the acousto-optic switch, the pulse width of 97 ns at a repetition rate of 20 kHz was obtained. The maximum peak-power of the fiber power amplifier is 2.1 kW and pulse energy is more than 204 μJ. This high power thulium-doped fiber laser has an all-fiber based configuration. We used a cladding power stripper (CPS) with matched passive fiber to remove residual pump light that leaked into cladding. The slope efficiency of the thulium-doped fiber power amplifier was 22.7%.
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