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Application of digital signal processing in locking of CW lasers on optical frequency combs
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SYSNO ASEP 0422396 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title Application of digital signal processing in locking of CW lasers on optical frequency combs Author(s) Čížek, Martin (UPT-D) RID, ORCID, SAI
Číp, Ondřej (UPT-D) RID, SAI, ORCID
Šmíd, Radek (UPT-D) RID, SAI
Hrabina, Jan (UPT-D) RID, ORCID, SAI
Mikel, Břetislav (UPT-D) RID, SAI
Lazar, Josef (UPT-D) RID, ORCID, SAINumber of authors 6 Source Title 21th annual International Conference on Advanced Laser Technologies ALT´13. Book of Abstracts. - Budva : University of Montenegro, 2013
S. 146Number of pages 1 s. Publication form Online - E Action ALT´13. Annual International Conference on Advanced Laser Technologies /21./ Event date 16.09.2013-20.09.2013 VEvent location Budva Country ME - Montenegro Event type WRD Language eng - English Country ME - Montenegro Keywords digital signal processing ; CW lasers ; optical frequency combs Subject RIV BH - Optics, Masers, Lasers R&D Projects GPP102/11/P819 GA ČR - Czech Science Foundation (CSF) GAP102/10/1813 GA ČR - Czech Science Foundation (CSF) TA01010995 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EE2.4.31.0016 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UPT-D - RVO:68081731 Annotation In cases when it is needed to lock the optical frequency of a CW laser such as a DFB diode laser to a precise metrological reference a possible way is to utilize a setup where an optical frequency comb is used for transferring the stability of a radio frequency (RF) normal (GPS-disciplined oscillator, H-maser, etc.) to the optical domain. Such system takes the signal generated by the RF standard (usually 10 MHz or 100 MHz) as a reference and stabilizes the repetition (frep) and offset (fceo) frequencies of the comb contained in the RF output of the f-2f interferometer. In the next level, the frequency of a beat note (fbeat) between the tunable DFB diode laser and a selected component of the comb spectrum is locked to the same RF standard. As a result, we get a diode laser with optical frequency derived directly from a stable RF reference. These control loops are usually built around analog electronic circuits processing the output signals from fast photodetectors. 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. The measurements of frep, fceo and fbeat were analyzed by means of calculating Allan deviations for times ranging up to 10 000 s. The digital system is able to stabilize the 100 MHz repetition frequency with absolute deviations observed in mHz. The offset frequency stabilized at 10.7 MHz center exhibits fluctuations in kHz order. In case of fbeat stabilized at 5 MHz offset from a comb spectrum component, the observed fluctuations were in 0.1 kHz order of magnitude. Observed stabilities in the RF domain result in the overall performance of the complete system in the optical domain where it is able to stabilize a diode laser with optical frequency stability in the 10–11 order. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2014
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