RT info:eu-repo/semantics/article T1 Effect of the residual doping on the performance of InN epilayers as saturable absorbers for ultrafast lasers at 1.55µm A1 Monroy Lafuente, Laura A1 Jiménez Rodríguez, Marco A1 Ruterana, Pierre A1 Monroy, Eva A1 González Herráez, Miguel A1 Naranjo Vega, Fernando Bernabé K1 Electrónica K1 Electronics AB We report on the improvement of performance of InN-based saturable absorbers in fiber lasers operating at 1.55 mum by reducing the residual doping, due to the lower Burstein-Moss effect. The improved tuning of the band-to-band transition with respect to the operation wavelength leads to an enhancement of nonlinear optical effects, resulting in 30 % of modulation depth. We introduce the development of an ultrafast mode-locked fiber laser using an improved InN-based saturable absorber that incorporates a buffer layer between the active layer and the substrate. The laser delivers output pulses with a temporal width of 220 fs, a repetition rate of 5.25 MHz, and high-pulse energy of 5.8 nJ. PB YR 2019 FD 2019-07-01 LK http://hdl.handle.net/10017/38450 UL http://hdl.handle.net/10017/38450 LA eng NO Ministerio de Economía, Industria y Competitividad DS MINDS@UW RD 24-abr-2024