With a fiber pigtailed electro-optic modulator as the active Q-switch. mode-hopping-free single-longitudinal-mode pulses are generated by a ring cavity fiber laser based on the injection seeding technique. The experimental results show that the single-longitudinal-mode oscillating properties of the laser may be determined by the power and the center frequency of the injection seed rat... https://www.unitedssports.shop/product-category/fan-shop-nfl-novelty/