Feedback-controlled and digitally processed coherent population trapping resonance conversion in 87Rb vapour to high-contrast resonant peak

S. Kobtsev, D. Radnatarov, S. Khripunov, I. Popkov, V. Andryushkov, T. Steshchenko, V. Lunin, Yu Zarudnev

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

This work reports on the study of a new approach to achievement of high-contrast resonant signals from coherent population trapping (CPT) resonances in 87Rb vapour based on feedback control and real-time digital processing of several measured parameters. This method consists in stabilisation of the value of a function depending on several system parameters measured as the frequency difference of the bichromatic pump radiation is scanned through adjustment of the pumping radiation power with a feedback loop. The present work made use of two such parameters: the pumping radiation power incident on and exiting from the optical cell. Exploration of the proposed method has shown that stabilisation of a linear combination of these two parameters results in a resonant peak whose contrast exceeds that of regular CPT resonance by more than two orders of magnitude at relatively slow CPT resonance scan rates, (scanning frequency of the frequency difference of the bichromatic field ∼1 Hz). When dynamically exciting the CPT resonance (the scan frequency of the frequency difference of the bichromatic field equal to 2 kHz), the resonant peak contrast was enhanced by over an order of magnitude.

Original languageEnglish
Article number043016
Number of pages7
JournalNew Journal of Physics
Volume19
Issue number4
DOIs
Publication statusPublished - 11 Apr 2017

Keywords

  • coherent population trapping resonance
  • feedback
  • Rb vapour
  • real-time digital processing
  • FREQUENCY STANDARD
  • LINE

Fingerprint Dive into the research topics of 'Feedback-controlled and digitally processed coherent population trapping resonance conversion in <sup>87</sup>Rb vapour to high-contrast resonant peak'. Together they form a unique fingerprint.

Cite this