On the thermal noise limit of ultrastable optical cavities

Zhadnov, N. O.; Kudeyarov, K. S.; Kryuchkov, D. S.; Semerikov, I. A.; Khabarova, K. Yu.; Kolachevsky, N. N.

doi:10.1070/qel16654

Cited by 13 publications

(8 citation statements)

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“…Increasing the length from 78 mm (our previous cavity generation 28 ) to 480 mm allowed to decrease their thermal noise limit from 10 -15 to 10 -16 according to (1). The increase of the length reduces the fractional contribution of the mirror position fluctuations and makes the mode spots on the mirrors larger, so thermal fluctuations are averaged more effectively 18 .…”

Section: Design Of the Cavitiesmentioning

confidence: 99%

“…The laser frequency can be locked to a cavity eigenmode by the various methods, including the most widespread -Pound-Drever-Hall (PDH) technique 16 . Stability of the cavity resonant frequency relies on the special mechanical properties of its constituent materials, rigorous thermal stabilization, isolation from environmental noise, and is fundamentally limited by the thermal motion of cavity 17,18 . Among the alternatives to FP cavities, there are whispering-gallery mode microcavities 19 , spectral hole burning 20 , Brillouin lasers with fiber cavities 21 and locking to narrow transitions in thermal atomic beams 22 .…”

Section: Introductionmentioning

confidence: 99%

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48 -cm-long room-temperature cavities in vertical and horizontal orientations for Sr optical clock

et al. 2021

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The development of an optical clock with ultimate accuracy and stability requires lasers with very narrow linewidth. We present two ultrastable laser systems based on 48 cm long Fabry-Perot cavities made of ULE glass in horizontal and vertical configurations operating at 698 nm. Fractional frequency instability of the beat signal between two lasers reaches 1.6•10 -15 at the averaging time of 1 s. We experimentally characterized the contribution of the different noise sources (power fluctuations, residual amplitude modulation, the Doppler noise, sensitivity to the shock impact) and found that in our case the laser frequency instability to a large extent is determined by an optoelectronic feedback loop. Although the vertical configuration proved to be easier to manufacture and to transport, it turned out that it is much more sensitive to acoustics and horizontal accelerations compared to the horizontal one. Both laser systems were transported over a 60 km distance from the Lebedev Physical Institute to the Russian National Metrology Institute (VNIIFTRI) where they serve as local oscillators for spectroscopy of the clock transition in the recently developed strontium optical clock.

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Section: Design Of the Cavitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

48 -cm-long room-temperature cavities in vertical and horizontal orientations for Sr optical clock

et al. 2021

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“…Accurate calculations, proceeded for silica systems, resulted in following fundamental fractional instability limits: 3×10 -16 and 6×10 -17 for cavities with dielectric (1) and crystalline mirrors (2) respectively [2]. We have systems (1,2) assembled at this moment. (1) has finesse about 580'000, measured by ringdown method; (3) -about 250'000.…”

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confidence: 99%

“…The idea of lowering temperature with stabilization at the point of zero extension is presented by two cryogenic single-crystal silicon cavitiesone with dielectric SiO2/Ta2O5 mirrors (1) and one with crystalline GaAs/AlGaAs mirrors (2). Silicon is a very promising material for upcoming ultra-stable cavities because it has a temperature of zero extension at 124 K and has a very low mechanical loss angle.…”

mentioning

confidence: 99%