Abstract
An iron-cobalt co-doped ZnSe polycrystalline (Co,Fe:ZnSe) was prepared by the thermal diffusion method, and its nonlinear optical response was characterized for the first time. Using the as-prepared Co,Fe:ZnSe as a saturable absorber (SA), the blue laser diode pumped Q-switched Pr:YLF laser at 607 nm (orange), and 639 nm (red) was successfully realized. For 607 nm, the Q-switched laser delivered the shortest pulse width of 59 ns with a repetition rate of 15 kHz. For 639 nm, the shortest pulse width and maximum repetition rate were 119 ns and 32 kHz, respectively. The experimental results indicate that the Co,Fe:ZnSe SA has a great potential for optical pulse generation in the visible region.
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