Digital approach to stabilizing optical frequency combs and beat notes of CW lasers

Martin Čížek; Ondřej Číp; Radek Šmíd; Jan Hrabina; Břetislav Mikel; Josef Lazar

doi:10.1117/12.2035733

10 October 2013 Digital approach to stabilizing optical frequency combs and beat notes of CW lasers

Martin Čížek, Ondřej Číp, Radek Šmíd, Jan Hrabina, Břetislav Mikel, Josef Lazar

Proceedings Volume 8916, Sixth International Symposium on Precision Mechanical Measurements; 89161H (2013) https://doi.org/10.1117/12.2035733
Event: Sixth International Symposium on Precision Mechanical Measurements, 2013, Guiyang, China

Abstract

In cases when it is necessary to lock optical frequencies generated by an optical frequency comb to a precise radio frequency (RF) standard (GPS-disciplined oscillator, H-maser, etc.) the usual practice is to implement phase and frequency-locked loops. Such system takes the signal generated by the RF standard (usually 10 MHz or 100 MHz) as a reference and stabilizes the repetition and offset frequencies of the comb contained in the RF output of the f-2f interferometer. These control loops are usually built around analog electronic circuits processing the output signals from photo detectors. This results in transferring the stability of the standard from RF to optical frequency domain. The presented work describes a different approach based on digital signal processing and software-defined radio algorithms used for processing the f-2f and beat-note signals. Several applications of digital phase and frequency locks to a RF standard are demonstrated: the repetition (f_rep) and offset frequency (f_ceo) of the comb, and the frequency of the beat note between a CW laser source and a single component of the optical frequency comb spectrum.

Citation Download Citation

Martin Čížek, Ondřej Číp, Radek Šmíd, Jan Hrabina, Břetislav Mikel, and Josef Lazar "Digital approach to stabilizing optical frequency combs and beat notes of CW lasers", Proc. SPIE 8916, Sixth International Symposium on Precision Mechanical Measurements, 89161H (10 October 2013); https://doi.org/10.1117/12.2035733

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