As an eye-safe wavelength laser, 1540um, Er3+/ Yb3+ co-doped phosphate glass lasers have brought in much attention for their density and low costs, such as laser generation and also signal amplification wavelength of 1540nm is simply at the placement of the eye-safe and the fiber optic communication window. 1540nm lasers have been made use of in ranging finder, radar, and target acknowledgment.