1.5 GHz Pulse Generation From a Monolithic Waveguide Laser With a Graphene-Film Saturable Output Coupler

TL;DR

This paper demonstrates a 1.5 GHz pulse laser using a graphene-coated mirror as a saturable absorber, achieving high efficiency and mode-locked pulses at 1039nm in a monolithic waveguide laser.

Contribution

It introduces a graphene-film saturable absorber on an output coupler for a monolithic waveguide laser, enabling high repetition rate mode-locking at 1039nm.

Findings

Achieved 1.5 GHz pulse repetition rate.

Produced mode-locked pulses at 1039nm.

High slope and optical conversion efficiencies.

Abstract

We fabricate a saturable absorber mirror by coating a graphene film on an output coupler mirror. This is then used to obtain Q-switched mode-locking from a diode pumped linear cavity waveguide laser inscribed in Ytterbium-doped Bismuthate Glass, with high slope and optical conversion efficiencies. The laser produces mode-locked pulses at 1039nm, with 1.5GHz repetition rate at an average 202mW output power. This performance is due to the combination of the graphene saturable absorber with the high quality laser glass.