Abstract
Ultrashort-pulsed laser sources with repetition rates over 1 GHz are important for applications in telecommunications, frequency metrology and in fundamental physics. Here we present an approach to build-up compact ultrafast single-mode waveguide lasers with gigahertz repetition rate using graphene saturable absorber mirror (GSAM) as the output coupler [1, 2]. In particular, due to very efficient coupling of pump light into the femtosecond laser inscribed waveguide [3] and wavelength insensitive properties of graphene this approach demonstrates the possibility to achieve simultaneous generation of <20 picosecond pulses centered at 1061 and 1064 nm with 9.8 GHz repetition rate. Precise control of the intracavity dispersion and losses through the length of air-gap interferometer formed between the active medium and the GSAM allowed us to demonstrate the possibility of switching between single and dual-wavelength lasing and to adjust the stability of self-starting mode-locking at particular wavelength. However due to a constant trade-off between losses and dispersion compensation in the current scheme the CW mode-locking can be achieved only in a single-wavelength regime. We also demonstrated applicability of the developed laser as a tunable master-oscillator for fiber-based amplified laser systems and achieved 530 mW output power at 1061 nm using Yb-doped fiber amplifier. Our study open up new aspects of passive mode-locking in waveguide Nd:YAG lasers and demonstrates the compatebility of the developed device with the widely used fiber schemes.
© 2019 IEEE
PDF ArticleMore Like This
A. G. Okhrimchuk, P. A. Obraztsov, M. G. Rybin, S. V. Garnov, and E. D. Obraztsova
CA_11_1 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2015
Amol Choudhary, Shonali Dhingra, Brian D’Urso, Pradeesh Kannan, and David P. Shepherd
ATu2A.54 Advanced Solid State Lasers (ASSL) 2014
Y. Y. Ren, S. J. Beecher, G. Brown, A. Ródenas, A. Lancaster, F. Chen, and A. K. Kar
ThA1_3 Conference on Lasers and Electro-Optics/Pacific Rim (CLEO/PR) 2013