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This paper describes the development and evaluation of compact and simple acetylene-stabilized diode laser frequency standards in the 1.55 µm spectral region. A variety of spectroscopic configurations have been investigated, using bulk acetylene cells and an acetylene-filled hollow core photonic crystal fiber. Frequency stability and reproducibility data, obtained by heterodyne beat frequency comparison...
Frequency stability and comparison measurements have been undertaken between a pair of optical frequency standards based on the 2S½ - 2D5/2 transition in independent trapped 88Sr+ ions confined in two end-cap traps. A frequency stability of 2.5 × 10−16 at 4000 s has been measured, improving as τ−½. A null frequency offset at the 3 × 10−16 level has been measured. A measurement of the ratio of the...
The repetition rate of a mode-locked laser is transferred over 50 km of spooled fibre with instability below 5 times 10-15 tau-1/2, rendering this technique suitable for disseminating state-of-the-art microwave oscillators and optically-derived microwave references.
In this paper, a pair of diode lasers at 674 nm, locked to two independent ultralow-expansion high-finesse cavities, have been characterized by monitoring the beat frequency between them. The individual laser linewidth of 1.4 Hz for a 3-s averaging time broadened to 4 Hz at 30 s. The relative frequency stability of the beat at 1s is 2.5 10-15. One of the lasers has been used to interrogate the 88Sr...
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