Počet záznamů: 1
Digital System for Keeping Optical Frequency Comb in Long- Term Stable Operation
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SYSNO ASEP 0436829 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Digital System for Keeping Optical Frequency Comb in Long- Term Stable Operation Tvůrce(i) Čížek, Martin (UPT-D) RID, ORCID, SAI
Šmíd, Radek (UPT-D) RID, SAI
Hucl, Václav (UPT-D) RID, ORCID, SAI
Lazar, Josef (UPT-D) RID, ORCID, SAI
Číp, Ondřej (UPT-D) RID, SAI, ORCIDCelkový počet autorů 5 Zdroj.dok. 28th European Frequency and Time Forum (EFTF 2014). - Piscataway : IEEE, 2014 - ISBN 978-1-4799-5252-6 Rozsah stran s. 193-195 Poč.str. 3 s. Forma vydání Online - E Akce EFTF 2014. European Frequency and Time Forum /28./ Datum konání 23.07.2014-26.07.2014 Místo konání Neuchatel Země CH - Švýcarsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova optical frequency comb ; long-term operation ; stabilization ; digital signal processing Vědní obor RIV BH - Optika, masery a lasery Obor OECD Optics (including laser optics and quantum optics) CEP GAP102/10/1813 GA ČR - Grantová agentura ČR LO1212 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy ED0017/01/01 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy EE2.4.31.0016 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UPT-D - RVO:68081731 UT WOS 000392736300052 EID SCOPUS 84971451013 Anotace A passive optical resonator is a special sensor used for measurement of lengths on the nanometer and sub-nanometer scale. A stabilized optical frequency comb can provide an ultimate reference for measuring the wavelength of a tunable laser locked to the optical resonator. If we lock the repetition and offset frequencies of the comb to a high-grade radiofrequency (RF) oscillator its relative frequency stability is transferred from the RF to the optical frequency domain. Experiments in the field of precise length metrology of low-expansion materials are usually of long-term nature so it is required that the optical frequency comb stays in operation for an extended period of time. The optoelectronic closed-loop systems used for stabilization of combs are usually based on conventional analog electronic circuits processing signals from photodetectors. From an experimental point of view, these setups are very complicated and sensitive to ambient conditions and disturbances, especially in the optical part, therefore maintaining long-time operation is not easy. The presented work deals with a novel approach based on digital signal processing and software-defined radio algorithms. We are using a twostage stabilization scheme. A frequency-locked loop (FLL) pre-stabilizes the offset frequency and steers it into the capture range of a phase-locked loop (PLL) that consequently takes control. Such combination of FLL and PLL together with additional control logics is also able to handle situations when the PLL unexpectedly goes out of lock and so it is capable of keeping the optical frequency comb in a long-time stable operation. The stability of the resulting system was investigated. Allan deviations from data measured during 8 days of operation were computed. The resulting long-term stability of the setup is better than 1.6 x 10−11. Pracoviště Ústav přístrojové techniky Kontakt Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Rok sběru 2015
Počet záznamů: 1