Phase correlation during two-photon resonance process in an active cavity

In this paper, we experimentally demonstrate a strong correlation between the frequencies of the Raman pump and the Raman probe inside an optically pumped Raman laser. We show that the correlation is due to rapid adjustment of the phase of the dipoles that produce the Raman gain, following a sudden...

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Bibliographic Details
Published in:Applied optics (2004) 2020-01, Vol.59 (3), p.866
Main Authors: Zhou, Zifan, Condon, Nicholas J, Hileman, Devin J, Tseng, Shih C, Shahriar, Selim M
Format: Article
Language:English
Subjects:
Accelerometers
Dipoles
Lasers
Numerical models
Raman lasers
Sensitivity enhancement
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Summary:In this paper, we experimentally demonstrate a strong correlation between the frequencies of the Raman pump and the Raman probe inside an optically pumped Raman laser. We show that the correlation is due to rapid adjustment of the phase of the dipoles that produce the Raman gain, following a sudden jump in the phase of the Raman pump. A detailed numerical model validates this interpretation of the phase correlation. The width of the spectrum of the beat between the Raman pump and the Raman laser is significantly narrowed due to this correlation. As a result, the minimum measurable change in the cavity length, for a given linewidth of the Raman pump laser, is substantially reduced. Therefore, this finding is expected to enhance the sensitivity of such a laser in various metrological applications (e.g., accelerometry).
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.380614