Low-loss GaInNAs saturable absorber mode locking a 1.3-μm solid-state laser

Liverini, L.; Schön, S.; Grange, R.; Haiml, M.; Zeller, S.C.; Keller, U.
May 2004
Applied Physics Letters;5/17/2004, Vol. 84 Issue 20, p4002
Academic Journal
We have demonstrated stable self-starting passive cw mode locking of a solid-state laser at about 1.3 µm using a GaInNAs semiconductor saturable absorber mirror (SESAM). GaInNAs SESAMs show negligible nonsaturable losses, low saturation fluences (11 µJ/cm²) and picosecond decay times which make them well-suited for self-starting and stable cw mode locking. Sub-10-ps pulses were produced with a Nd:YLF laser at 1314 nm. The incorporation of about 2% nitrogen into InGaAs redshifts the absorption edge above 1330 nm and reduces the strain in the saturable absorber grown on a GaAs/AlAs Bragg mirror. Final absorption edge adjustments have been made with thermal annealing which blueshifts the absorption edge.


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