Abstract

We report a design for a power-scalable all-fiber passively Q-switched laser that uses a large mode area Yb-doped fiber as a gain medium adiabatically tapered to an unpumped single-mode Yb-doped fiber, which serves as a saturable absorber. Through the use of a comprehensive numerical simulator, we demonstrate a passively Q-switched $1030\mathrm{nm}$ pulsed laser with $14\mathrm{ns}$ pulse duration and $0.5\mathrm{mJ}$ pulse energy operating at $200\mathrm{kHz}$ repetition rate. The proposed configuration has a potential for orders of magnitude of improvement in both the pulse energies and durations compared to the previously reported result. The key mechanism for this improvement relates to the ratio of the core areas between the pumped inverted large mode area gain fiber and the unpumped doped single-mode fiber.

© 2011 Optical Society of America

400 µJ 79 ns amplified pulses from a Q-switched fiber laser using an Yb³⁺-doped fiber saturable absorber

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