Aleksandr S. Dychkov

Stabilisation of a fibre frequency synthesiser using acousto-optical and electro-optical modulators

A fibre-optic frequency synthesiser is developed that is stabilised to the optical frequency standard based on molecular iodine . The possibility of transferring stability of the optical frequency standard to other optical frequencies in the IR range and to the RF range by using synthesiser phase-locked loops (PLLs) with acousto-optical and electro-optical modulators is experimentally demonstrated. The additive instability introduced into the optical frequency comb of the synthesiser (which arises due to PLL residual random errors) is several orders less than the intrinsic instability of the reference optical frequency standard employed (i.e., is noticeably less than for and for ).

Femtosecond optical clock with the use of a frequency comb

The principles of precision measurement of frequency intervals in optical range with the help of femtosecond lasers are described. An experimental scheme of femtosecond optical clock is described. The characteristics of the basic elements and units of the setup are presented. The results of a broadened spectrum researches with the help of tapered fibers are reported.

Fiber-based femtosecond optical frequency comb stabilized to iodine frequency standard

A fiber-based femtosecond optical frequency comb spanning wavelengths from 1 to 2 μm was stabilized precisely to an iodine frequency standard by means of heterodyne optical phase-locked loops. It enables transfer of frequency stability across electromagnetic spectrum and implementation of compact optical clocks with ~10-15 long-term instability.

Femtosecond optical clock

An experimental scheme of femtosecond optical clock is described. The characteristics of the elements and blocks of the setup are given. Possible application areas of the optical clock described are discussed.

Absolute frequency measurements in precision laser spectroscopy of muonium

Frequency standard at 732 nm for absolute measurements of the muonium 1S-2S transition frequency has been developed. A suitable reference line for that standard was found in the absorption spectra of the iodine vapor heated up to 600 degree(s)C. In order to measure the absolute frequency of the developed standard, an optical synthesis chain was built up. The frequencies to be measured were synthesized from two secondary standard frequencies: a frequency of the diode laser stabilized to rubidium absorption line and a frequency of the CO2 laser, locked to CO2 absorption line. An accuracy of the measurements is order 10

Low frequency noise distributed-feedback ytterbium fibre laser

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