Journal
SENSORS
Volume 21, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/s21144696
Keywords
optical resonator; in situ vibration measurement; cryogenic temperature; vibration sensitivity
Funding
- National Key RAMP
- D Program of China [2017YFA0304400]
- Key-Area Research of GuangDong Province [2019B030330001]
- National Natural Science Foundation of China [61875065, 11774108, 91536116, 91336213]
- China Postdoctoral Science Foundation [2017M622400]
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The analysis of vibrational noise contribution to laser frequency in cryogenic ultrastable laser cavities has paved the way for in situ accurate evaluation of vibrational noise in cryogenic systems. The vibration sensitivities change at different excitation frequencies, contributing to a frequency stability of 1.3x10(-15) in a homemade 6 cm sapphire optical resonator cooled to 3.4 K. This research may also assist in cryostat design and cryogenic precision measurements.
Cryogenic ultrastable laser cavities push laser stability to new levels due to their lower thermal noise limitation. Vibrational noise is one of the major obstacles to achieve a thermal-noise-limited cryogenic ultrastable laser system. Here, we carefully analyze the vibrational noise contribution to the laser frequency. We measure the vibrational noise from the top of the pulse-tube cryocooler down to the experiment space. Major differences emerge between room and cryogenic temperature operation. We cooled a homemade 6 cm sapphire optical resonator down to 3.4 K. Locking a 1064 nm laser to the resonator, we measure a frequency stability of 1.3x10(-15). The vibration sensitivities change at different excitation frequencies. The vibrational noise analysis of the laser system paves the way for in situ accurate evaluation of vibrational noise for cryogenic systems. This may help in cryostat design and cryogenic precision measurements.
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