Low-loss quantum-dot-based saturable absorber for efficient femtosecond pulse generation

Lagatsky, A. A.; Bain, F. M.; Brown, C. T. A.; Sibbett, W.; Livshits, D. A.; Erbert, G.; Rafailov, E. U.
December 2007
Applied Physics Letters;12/3/2007, Vol. 91 Issue 23, p231111
Academic Journal
We report the efficient generation of femtosecond pulses from a diode-pumped solid-state laser that has been passively mode locked using a quantum-dot-based saturable absorber. Average output powers up to 1.15 W and transform-limited pulses as short as 114 fs were obtained around 1040 nm with a pulse repetition frequency of 107 MHz from a diode-pumped Yb3+:KY(WO4)2 laser. The InGaAs quantum-dot saturable absorber was characterized to have a saturation fluence of 25 μJ/cm2 and nonsaturable losses of less than 0.2% with an initial low-signal absorption of 2.5% at 1040 nm.


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