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Feedback-stabilized Nd:YLF amplifier system for generation of picosecond pulse trains of an exactly rectangular envelope

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4 Author(s)
Will, Ingo ; Max Born Inst. for Nonlinear Opt. & Short Pulse Spectrosc., Berlin, Germany ; Liero, A. ; Mertins, D. ; Sandner, W.

We describe the amplifier chain of the photocathode laser of the TESLA Test Facility. This chain is optimized for amplification of trains of picosecond pulses. At its output, pulse trains with a rectangularly shaped envelope of 0.7% flatness and a long-term stability of the energy in the individual picosecond pulses in excess of 0.9% are obtained. This stability is achieved by using a computerized feedback control system, which we describe in detail together with the versatile feedback algorithm applied. The feedback loop performs a tight adjustment of both the shape and magnitude of the flashlamp pulses as well as the starting time of the pump with respect to the pulse train. High-current insulated gate bipolar transistors are used to directly manipulate the flashlamp current in a microsecond time scale

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Quantum Electronics, IEEE Journal of  (Volume:34 ,  Issue: 10 )