A New Generation of High Power Waveform Controlled Few Cycle Light Sources Introduction Proof of Concept: Few Cycle Pulse Generation and Carrier Envelope Phase Stabilization Power Scalable Concepts From the Near to the Mid Infrared Outlook and Conclusions Appendix This thesis presents first successful experiments to carrier envelope phase stabilize a high power mode locked thin disk oscillator and to compress the pulses emitted from this laser to durations of only a few optical cycles. Moreover the monograph introduces several methods to achieve power scalability of compression and stabilization techniques. All experimental approaches are compared in detail and may serve as a guideline for developing high power waveform controlled few cycle light sources which offer tremendous potential to exploit extreme nonlinear optical effects at unprecedentedly high repetition rates and to establish table top infrared light sources with a unique combination of brilliance and bandwidth. As an example the realization of a multi Watt multi octave spanning mid infrared femtosecond source is described. The thesis starts with a basic introduction to the field of ultrafast laser oscillators. It subsequently presents additional details of previously published research results and establishes a connection between them. It therefore addresses both newcomers to and experts in the field of high power ultrafast laser development