Efficient detection and control of the carrier-envelope offset frequency in a self-referencing optical frequency synthesizer
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- McFerran, J., Marić, M. & Luiten, A. Appl. Phys. B (2004) 79: 39. doi:10.1007/s00340-004-1502-x
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An efficient means of isolating and detecting the carrier-envelope offset frequency signal in an optical frequency synthesizer is demonstrated. The technique uses spliced and connectorized fiber for comb broadening, a periodically poled KTP crystal for doubling 1064-nm light in the supercontinuum, and a laser-line filter at 532 nm for comb-section selection. The technique produces an offset frequency with a 40-dB signal-to-noise ratio in a resolution bandwidth of 100 kHz with as little as 55 GW/cm2 of peak pulse intensity inside the fiber. The strong signal-to-noise ratio helps realize an offset frequency signal with frequency instability of 1 mHz at 1 s when controlled through feedback to the optical power driving the femtosecond laser.