1. Performance enhancement of an ultrafast all-fiber laser based on an InN saturable absorber using GRIN coupling
- Author
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L. Monroy, Miguel Gonzalez-Herraez, Fernando B. Naranjo, Miguel Soriano-Amat, Eva Monroy, Óscar Esteban, Departamento de Electronica, Grupo de Ingenieria Fotonica, Universidad de Alcalá - University of Alcalá (UAH), Nanophysique et Semiconducteurs (NPSC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)
- Subjects
Materials science ,Indium nitride ,Physics::Optics ,02 engineering and technology ,01 natural sciences ,law.invention ,010309 optics ,Condensed Matter::Materials Science ,chemistry.chemical_compound ,[SPI]Engineering Sciences [physics] ,020210 optoelectronics & photonics ,Optics ,law ,Fiber laser ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Coupling ,[PHYS]Physics [physics] ,business.industry ,Saturable absorption ,Laser ,Atomic and Molecular Physics, and Optics ,Lens (optics) ,Semiconductor ,chemistry ,business ,Ultrashort pulse - Abstract
International audience; Indium nitride (InN)-based semiconductor saturable absorbers have previously shown advantages for application in near-IR fiber lasers due to their broad modulation depth, ultrafast nonlinear response and thermal stability. However, up to now all demonstrated saturable absorber elements based on InN (either transmissive or reflective) have shown limited performance due to poor coupling and insertion losses. We present here a simple mode-locking device based on a GRIN-rod lens in conjunction with an InN semiconductor saturable absorber mirror (SESAM) for its use in a passively mode-locked all-fiber laser system operating at telecom wavelengths. Our results demonstrate that this coupling element ensures not only a compact, turnkey and alignment-free design but also a highly-stable optical femtosecond pulse train. The reduction of insertion losses (3.5 dB) enables the generation of 90-fs ultrafast pulses with an average power of 40 mW and up to 7 nJ of pulse energy without the need for additional amplification.
- Published
- 2021