Active Q-switched Fiber Lasers with Single and Dualwavelength Operation

Abstract

A brief explanation on Q-switched fiber laser operating principle for active technique in terms of operation characteristics is presented. Experimental analysis of proposed pulsed fiber lasers by the active Q-switched technique is demonstrated. Experimental setups include the use of Er/Yb doped fiber as a gain medium and an acousto-optic modulator as cavity elements. Setup variations include the use of fiber Bragg gratings for wavelength selection and tuning and Sagnac interferometer for wavelength selection in single wavelength operation and for cavity loss adjustment in dual wavelength operation. The experimental analysis of principal characteristics of single-wavelength operation of the fiber laser and cavity loss adjustment method for dual-wavelength laser operation are discussed.

Q-switched fiber laser using carbon platinum saturable absorber on side-polished fiber

“…The relatively high repetition rate can be achieved due to the low saturable optical intensity of the SA [28,29] . The repetition rate achieved in this work is substantially higher than that typically observed, ranging from a few kHz to 100 kHz [30] , and it is also possible to achieve higher repetition rates should higher pump powers be available. Figure 9 provides the radio-frequency (RF) scan of the generated pulses.…”