Passively Q-switched Tm:CaLu0.1Gd0.9AlO4 laser at 2â
µm with hematite nanosheets as the saturable absorber.
Opt Express
; 28(11): 16893-16899, 2020 May 25.
Article
em En
| MEDLINE
| ID: mdl-32549502
ABSTRACT
We report the first passive Q-switching operation at 1.95â
µm utilizing the disordered TmCaLu0.1Gd0.9AlO4 (TmCLGA) crystal and the hematite (α-Fe2O3) nanosheets as the saturable absorber. The nonlinear saturable absorption properties of the hematite nanosheets were investigated by the conventional Z-scan technology. The modulation depth of 14.3% with the low saturation intensity of 205â
kW/cm2 was obtained, indicating that the hematite could be a suitable saturable absorber for the mid-infrared pulse generation. Using the disordered TmCLGA crystal as the gain medium, the passive Q-switching operation could be realized with the hematite nanosheets as the saturable absorber, producing the shortest pulse duration of 402â
ns with a repetition rate of 76 kHz. The experimental results convinced us that the hematite nanosheets could be of great interest in the optical pulse generation in the mid-infrared region.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Opt Express
Assunto da revista:
OFTALMOLOGIA
Ano de publicação:
2020
Tipo de documento:
Article