Upconversion-pumped femtosecond thulium laser at 2309â
nm mode-locked by a GaSb-based SESAM.
Opt Express
; 32(9): 15093-15105, 2024 Apr 22.
Article
em En
| MEDLINE
| ID: mdl-38859168
ABSTRACT
We report on a femtosecond thulium laser operating on the 3H4 â 3H5 transition with upconversion pumping around 1â
µm and passively mode-locked by a GaSb-based SEmiconductor Saturable Absorber Mirror (SESAM). This laser employs a 6 at.% TmLiYF4 laser crystal and a polarization maintaining Yb-fiber master oscillator power amplifier at 1043â
nm as a pump source addressing the 3F4 â 3F2,3 excited-state absorption transition of Tm3+ ions. In the continuous-wave regime, the Tm-laser generates 616â
mW at â¼2313â
nm with a slope efficiency of 10.0% (vs. the incident pump power) and a linear polarization (π). By implementing a type-I SESAM with a single ternary strained In0.33Ga0.67Sb quantum well embedded in GaSb for sustaining and stabilizing the soliton pulse shaping, the self-starting mode-locked Tm-laser generated pulses as short as 870 fs at a central wavelength of 2309.4â
nm corresponding to an average output power of 208â
mW at a pulse repetition rate of 105.08â
MHz and excellent mode-locking stability. The output power was scaled to 450â
mW at the expense of a longer pulse duration of 1.93 ps. The nonlinear parameters of the SESAM are also reported.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article