We demonstrate carrier-envelope phase stabilization of a mode-locked Ti:sapphire laser by use of quantum interference control of injected photocurrents in a semiconductor. No harmonic generation is required for this stabilization technique. Instead, interference between coexisting single- and two-photon absorption pathways in the semiconductor provides a phase comparison between different spectral components. The phase comparison, and the detection of the photocurrent that it produces, both occur within a single low-temperature-grown gallium arsenide sample. The carrier-envelope offset beat note fidelity is 30 dB in a 10-kHz resolution bandwidth. The out-of-loop phase-noise level is essentially identical to the best previous measurements with the standard self-referencing technique.
© 2005 Optical Society of America
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW
(270.1670) Quantum optics : Coherent optical effects
(320.7160) Ultrafast optics : Ultrafast technology
P. A. Roos, Xiaoqin Li, R. P. Smith, Jessica A. Pipis, T. M. Fortier, and S. T. Cundiff, "Solid-state carrier-envelope phase stabilization via quantum interference control of injected photocurrents," Opt. Lett. 30, 735-737 (2005)