Abstract
We analyzed frequency-domain characteristics of a femtosecond laser whose carrier-envelope phase (CEP) was stabilized by the direct locking method (DLM). To evaluate the CEP-stabilized laser with zero carrier-envelope-offset frequency (f ceo), as imposed by DLM, a self-referencing f-to-2f interferometer with a shifted frequency comb by an acousto-optic modulator was employed in an out-of-loop. The measurement of the square root of triangle variance confirmed that DLM is a phase-locking method. The tight locking was verified from a narrow bandwidth of f ceo, measured using the out-of-loop interferometer, and from a small frequency jitter measured with a frequency counter referenced to a Rb-clock. The femtosecond laser with CEP stabilized by DLM is, thus, well suited for applications in the frequency domain as well as in the time domain.
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Lee, Jh., Kim, E.B., Luu, T.T. et al. Frequency-domain performance of a femtosecond laser with carrier-envelope phase stabilized by the direct locking method. Appl. Phys. B 104, 793–797 (2011). https://doi.org/10.1007/s00340-011-4613-1
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DOI: https://doi.org/10.1007/s00340-011-4613-1