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Compact femtosecond lasers based of novel multipass cavities

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Kowalevicz Jr., Andrew M.
Ippen, Erich P.
Fujimoto, James G.

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This paper provides a comprehensive description of the design of compact femtosecond solid-state lasers that are based on novel multipass cavity (MPC) configurations to extend the resonator length. of special importance are the q-preserving MPCs, which leave invariant the original spotsize distribution and Kerr lens mode-locking point of the short cavity. The general design guidelines of q-preserving MPCs are first reviewed and a novel configuration is proposed for the case where the MPC consists of notch mirrors. A class of non-q-preserving compact cavities is also analyzed and conditions needed to minimize the deviation from the q-preserving configuration are discussed. The design and performance of a q-preserving and a non-q-preserving mode-locked Ti: Al2 O3 laser are then described as examples. These compact oscillators measuring only 30 cm × 45 cm could produce pulses as short as 19 fs at a repetition rate of around 31 MHz. Up to ∼ 3.6 nJ of pulse energy could be obtained with only ∼ 1.5 W of pump power. Finally, two-mirror MPC geometries are examined to investigate the limits of compactness and energy scaling.

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Institute of Electrical and Electronics Engineers (IEEE)

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Electrical engineering

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IEEE Journal of Quantum Electronics

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10.1109/JQE.2004.826438

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