Demonstration of a highly subluminal laser with suppression of cavity length sensitivity by nearly three orders of magnitude

Yablon, J.; Zhou, Z.; Condon, Nicholas J.; Hileman, Devin J.; Tseng, Shao-Chin; Shahriar, Selim M.

doi:10.1364/oe.25.030327

Cited by 12 publications

(8 citation statements)

References 17 publications

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“…( 17) applies only in these specific regions of anomalous dispersion, and does not apply for normal dispersion. Thus, we find that the linewidth of a laser containing a fast-light medium must increase, in difference with the predictions in [56,57].…”

Section:  contrasting

confidence: 99%

“…g n is the group index of the medium [56]. Additionally, the scale-factor enhancement at the CAD has been shown to be 1/ .…”

Section: Analogy With Lasers Containing a Dispersive Mediummentioning

confidence: 99%

“…However, it has also been predicted that Eq. ( 17) only applies for normal dispersion, and that the linewidth is unaffected by anomalous dispersion [56,57]. This would mean that the enhancement in precision is equal to the enhancement in scale factor itself, i.e., The eigenvalues are found by allowing  to be complex.…”

Section: Analogy With Lasers Containing a Dispersive Mediummentioning

confidence: 99%

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Non-Hermitian gyroscopes: Can exceptional points increase sensor precision?

Smith

Chang

Shahriar³

2022

Optical and Quantum Sensing and Precision Metrology II

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We show that exceptional-point (EP) sensors are fundamentally limited by excess noise owing to eigenmode nonorthogonality, to the extent that the enhancement in precision (the magnitude of the scale-factor enhancement divided by the square-root of the linewidth-enhancement factor 1/2 | | / SK ) is never greater than unity. Indeed, in the vicinity of an EP a hole of reduced precision opens up in parameter space, where the precision drops rapidly to zero within regions of deadband or unbroken PT-symmetry. Outside of these zero-sensitivity regions the precision is nonzero, approaching its maximum value of1 SK  at the EP. EPs, therefore, represent discontinuous transitions between these two regimes. We find that this behavior is universal, with the hole appearing regardless of the type of EP. Therefore, EPs should generally be avoided for sensors that utilize laser cavities. Moreover, we illustrate that a laser containing a medium at the critical anomalous dispersion is simply operating at an EP. Therefore, this limitation also applies to laser sensors based on fast light.

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Section:  contrasting

confidence: 99%

“…g n is the group index of the medium [56]. Additionally, the scale-factor enhancement at the CAD has been shown to be 1/ .…”

Section: Analogy With Lasers Containing a Dispersive Mediummentioning

confidence: 99%

Section: Analogy With Lasers Containing a Dispersive Mediummentioning

confidence: 99%

See 1 more Smart Citation

Non-Hermitian gyroscopes: Can exceptional points increase sensor precision?

Smith

Chang

Shahriar³

2022

Optical and Quantum Sensing and Precision Metrology II

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“…Recently, we have shown [11,12,29] that a Raman laser acts as a subluminal laser, with a quantum noise limited linewidth (Schwalow-Townes Linewidth: STL) that is expected to be narrower than that of a conventional laser by a factor equaling the square of the group index. In reference [12] the observed group index was 663, with an expected STL of 1.2 micro-Hz. Since the bi-frequency lasers described here are fundamentally Raman lasers, it is expected that these lasers would also have group indices that are substantially larger than unity, which in turn would imply very small STLs.…”

Section: Discussionmentioning

confidence: 99%

Phase-locked bifrequency Raman lasing in a double- Λ system

Alaeian

Shahriar

2018

Phys. Rev. A

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We show that it is possible to realize simultaneous Raman lasing at two different frequencies using a double-Λ system pumped by a bi-frequency field. The bi-frequency Raman lasers are phase-locked to one another, and the beat-frequency matches the energy difference between the two meta-stable ground states. Akin to a conventional Raman laser, the bi-frquency Raman lasers are expected to be subluminal. As such, these are expected to be highly stable against perturbations in cavity length, and have quantum noise limited linewidths that are far below that of a conventional laser. Because of these properties, the bi-frequency Raman lasers may find important applications in precision metrology, including atomic interferometry and magnetometry. The phase-locked Raman laser pair also represent a manifestation of lasing without inversion, albeit in a configuration that produces a pair of non-degenerate lasers simultaneoulsy. This feature may enable lasing without inversion in frequency regimes not accessible using previous techniques of lasing without inversion. To elucidate the behavior of this laser pair, we develop an analytical model that describes the stimulated Raman interaction in a double-Λ system using an effective 2-level transition. The approximation is valid as long as the excited states adiabatically follow the ground states, as verified by numerical simulations. The effective model is used to identify the optimal operating conditions for the bi-frequency Raman lasing process. This model may also prove useful in other potential applications of the double-Λ system, including generation of squeezed light and spatial solitons.

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“…For active cavities, Yablon et al [11] inferred a PF∼ 190 via analysis of the lasing linewidth. The increased stability regime (PF< 1) was demonstrated in lasing [12] cavities with the smallest being PF= 1/663 [13]. Superradiant ("bad-cavity") lasers, where an atomic gain line is much narrower than a cavity linewidth, exhibit ultra low PF< 10 −6 [14,15].…”

mentioning

confidence: 99%

Dispersion-enhanced tunability of the laser-frequency response to the cavity-length change

Cuozzo

Михайлов

2019

Phys. Rev. A

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We report on the controllable response of the lasing frequency to the cavity round-trip path change. This is achieved by modifying the dispersion of the intracavity medium in the four-wave mixing regime in Rb. We can either increase the response by at least a factor of 2.7 or drastically reduce it. The former regime is useful for sensitive measurements tracking the cavity round trip length and the latter regime is useful for precision metrology.

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Demonstration of a highly subluminal laser with suppression of cavity length sensitivity by nearly three orders of magnitude

Cited by 12 publications

References 17 publications

Non-Hermitian gyroscopes: Can exceptional points increase sensor precision?

Non-Hermitian gyroscopes: Can exceptional points increase sensor precision?

Phase-locked bifrequency Raman lasing in a double- Λ system

Dispersion-enhanced tunability of the laser-frequency response to the cavity-length change

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