Strong frequency correlation and anti-correlation between a Raman laser and its pump laser for positive and negative dispersions

• URL: http://arxiv.org/abs/2312.15841v1
• Date: Tue, 26 Dec 2023 01:15:54 GMT
• Title: Strong frequency correlation and anti-correlation between a Raman laser and its pump laser for positive and negative dispersions
• Authors: Zifan Zhou, Ruoxi Zhu, and Selim M. Shahriar
• Abstract summary: Frequency of a Raman laser is highly correlated or anti-correlated with the frequency of the Raman pump laser. Findings would play a critical role in determining the maximum achievable sensitivity of sensors employing such lasers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We show that the frequency of a Raman laser is highly correlated or anti-correlated with the frequency of the Raman pump laser, depending on whether the dispersion experienced by the Raman laser is positive or negative. For a subluminal laser, corresponding to a positive dispersion with a group index that is much larger than unity, the shift in its frequency is approximately the same as that in the Raman pump laser. In contrast, for a superluminal laser, corresponding to a negative dispersion with a group index that is close to zero, its frequency shifts in the direction opposite to that of the Raman pump lasers, and has an amplitude that is larger by a factor approximately equaling the inverse of the group index. These findings would play a critical role in determining the maximum achievable sensitivity of sensors employing such lasers, especially under conditions where the pump laser linewidth is broadened significantly beyond the Schawlow-Townes linewidth due to classical fluctuations.

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