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Novel optoelectronic scheme for subpicosecond laser-timing stabilization

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Abstract

Timing synchronization of optical with electrical signals has been realized recently by using a photoconductive switch in a phase-lock loop (PLL) as an optoelectronic timing discriminator (OETD) or phase detector.1 In this work, we present results on stabilization of the timing fluctuations of a pulse-compressed cw actively mode-locked Nd:Yag laser (82MHz system) by using this technique. Two photoconductive switches were optically activated and operated at the quiescent points of the inverse slopes of the biasing electrical pulse from a comb generator. The difference in the output of the two switches serves as the OETD output. The comb was driven at 246 MHz by a frequency synthesizer serving as the frequency reference. The signal driving the mode-locker was generated by frequency division (by 6) from the reference oscillator such that the laser pulse timing jitter could be suppressed by using a voltage-controlled phase shifter driven by the amplified and filtered output of the OETD. 1. Ci-Ling Pan and H.-H. Wu, IEEE Photon. Technol. Lett, vol. 4, 1300 (1992).

© 1993 Optical Society of America

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