Optimal Design of High Energy Similariton Thulium-Doped Fiber Lasers

High-energy ultra-fast pulse light source has been widely used in laser medical, environmental monitoring, optical communication, photon spectroscopy and other fields. Compared with conventional soliton fiber lasers, self-similar pulsed fiber lasers can produce higher energy optical pulses without optical wave splitting. In this paper, we have optimized design on dispersion-managed high energy self-similar pulse in thulium doped fiber laser by using numerical simulation method. It is found that, when fixing the filter bandwidth, with the increase of the cavity length and the pump power, the output power will increase. At the same time, Further more, with the shorter cavity length and lower pump power, to obtain a high energy self-similar pulse, a filter with broader bandwidth must be used. By optimizing cavity parameters, and choose the cavity length to be 362 cm, corresponding dispersion value of 0.2224 (ps2), filter bandwidth to be 32 nm, the small signal gain g0 to be 51 dB, pulses with pulse energy up to 32.75 nJ, dechirp pulse width of 142.64 fs have been obtained.