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We constructed a frequency-stabilized mode-locked femtosecond laser for optical frequency metrology. Results of the frequency measurements of I2-stabilized 633 nm HeNe laser and 532 nm frequency-doubled Nd:YAG laser and a cesium-atom-stabilized 852 nm diode laser are presented in the conference
An extended-cavity Littman-type diode laser, aiming the linewidth below 1 Hz, is in process to be developed. This laser is planned as the clock laser for the precise spectroscopy of the electric quadrupole 4s 2Sfrac12ap2D5/2 transition of a 43Ca+ ion
A pair of 778 nm rubidium two photon diode laser frequency standards has been developed at NPL. Their systematic sensitivity to various experimental parameters has been investigated and their stability and reproducibility characterized. Absolute frequency measurements have been made for two hyperfine components
To cater for the needs of industry the CSIR-NML has developed a primary optical frequency standard. The frequency standard is based on a technique of locking a diode laser's output wavelength to an absorption line of acetylene at a known pressure. These absorption lines are a fundamental characteristic of acetylene
The authors proceed with a research and development of an optical frequency standard based on the 2S1/2 - 2 D5/2 transition of 43Ca+ in a RF trap. For this purpose, motional sidebands of a single 40Ca + ion were observed and a stable laser-diode system for spectroscopy of 43Ca+ are being developed
A pair of 1.5 mum diode laser frequency standards stabilized to 13C2H2 have been developed at NPL. Their stability and long-term reproducibility have been characterized, and the absolute frequencies of several acetylene lines measured using a combination of frequency chain, femtosecond comb and passive optical frequency comb technologies
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