Abstract
Nonlinear optical switch based on two-dimensional material is the core device of Q-switched fiber laser. The concentration of two-dimensional material optical switch will directly affect its nonlinear optical absorption characteristics, thus changing the time-domain characteristics of the pulse. Therefore, the influence of two-dimensional material concentration on Q-switched optical pulse is studied, and a saturable absorption optical switch based on Ti: Bi2Te3 with different concentration is made through experiments. The influence of Ti: Bi2Te3 concentration on nonlinear optical absorption characteristics is analyzed, and the relationship between the modulation depth, pulse width, repetition frequency and single pulse energy of Q-switched optical pulse with different concentration Bi2Te3 is obtained. Finally, the Ti: Bi2Te3 concentration is optimized for the resonator parameters. When the pump power is 71 MW, the central wavelength is 1560 nm, the pulse width is 8 μ s, the repetition frequency is 14.2 kHz, the average output power is 2.15 MW, and the corresponding single pulse energy is 151.4 NJ.
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