this paper,a periodic lithium niobate (LiNbO3) electro optical intensity modulator with a fiber pigtail type Mach Zengde (MZ) structure is used for active Q tuning,and a tunable filter is designed to be incorporated into the ring cavity structure to achieve stable output of tunable pulsed lasers with wavelengths in the range of 1882 nm-1992nm.By adjusting the signal frequency applied to the modulator,pulse lasers with a tunable repetition frequency between 15 kHz and 70 kHz are produced.At a repetition frequency of 15 kHz and a pump power of 1 W,the maximum single pulse energy obtained is 6.4 μJ,with a peak power of 5.1W.This research exhibits advantages of all fiber configuration and a wide tunable wavelength range,contributing to further exploration of the tunable range and potential applications of Q switched pulse lasers.