Oriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared

Abstract

Zinc oxide (ZnO) nanorods (NRs) oriented along the crystallographic [001] axis are grown by the hydrothermal method on glass substrates. The ZnO NRs exhibit a broadband (1-2 μm) near-IR absorption ascribed to the singly charged zinc vacancy VZn-1. The saturable absorption of the ZnO NRs is studied at ≈1 μm under picosecond excitation, revealing a low saturation intensity, ≈10 kW/cm2, and high fraction of the saturable losses. The ZnO NRs are applied as saturable absorbers in diode-pumped Yb (≈1.03 μm) and Tm (≈1.94 μm) lasers generating nanosecond pulses. The ZnO NRs grown on various optical surfaces are promising broadband saturable absorbers for nanosecond near-IR lasers in bulk and waveguide geometries.