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Stabilization of femtosecond mode-locked Ti:sapphire laser for high-accuracy pulse interferometry

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3 Author(s)
Yasui, T. ; Dept. of Syst. & Human Sci., Osaka Univ., Japan ; Minoshima, Kaoru ; Matsumoto, M.

We propose a method of long-term stabilization of the repetition rate and the spectral envelope in a femtosecond mode-locked (fs-ML) laser pulse by a simple control method without modifying the laser cavity configuration. The effectiveness of the repetition-rate-stabilized fs-ML laser was evaluated in a long-optical-path (LOP) pulse interferometer with a short reference arm. The resulting accuracy in the LOP pulse interferometer was improved to one-seventh that of a free-running fs-ML laser. Moreover, the stabilization of the spectral envelope was estimated to suppress the fluctuation in the phase and group indices of an object under testing by 1/50, which can increase the measurement accuracy in pulse interferometry. The simple and practical stabilization method provides a means to increase the application of pulse interferometry using the fs-ML laser

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Quantum Electronics, IEEE Journal of  (Volume:37 ,  Issue: 1 )