Modeling and Analysis of a Pulsed Er-Tm Fiber Laser System

Abstract

A theoretical model concerning a double-cavity, pulsed, dual-wavelength Er-Tm fiber laser is built. In this laser system, saturation induced passive Q-switching of an Er-doped fiber laser and resonantly pumped gain-switching of a Tm-doped fiber laser are realized simultaneously. Related population transitions of the passive Q-switching and gain-switching processes in this laser system are described. Characteristics of the Er-Tm fiber laser are investigated and discussed with different pump powers and cavity reflectivities. Numerical results indicate that this double-cavity laser configuration shortens the lifetime and improves the maximum recovery ratio of the saturable absorber at high repetition rate.Index Terms-Fiber saturable absorber, Q-switch, gain-switch, Er-doped fiber laser.

Modeling of Tm–Ho codoped fiber saturable absorber based passive Q-switching of an Er-doped fiber laser

“…These improvements, (1)-( 3), related to the output characteristics of the 1550 nm pulse, are also experimentally observed in [9] and theoretically validated in [12] where a separate FSA resonator is exploited to shorten the lifetime of the excited state of the FSA and improve the operational efficiency of the laser system, indicating that codoping the Tm FSA with Ho ions has a similar effect to enclosing the Tm FSA in a separate resonator. The rise of the maximum repetition rate is also experimentally demonstrated in [14].…”

“…As for Tm-doped FSA, this double cavity design is also effective. In our previous work, an Er-Tm fiber laser was investigated theoretically [12]. Simulation results indicate that closing the Tm-doped FSA in a separate resonator shortens the lifetime and improves its recovery ratio at a high repetition rate.…”