Squeezing the fundamental temperature fluctuations of a high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Q</mml:mi></mml:mrow></mml:math>microresonator

Sun, Xiaoming; Luo, Rui; Zhang, X.-C.; Lin, Qiang

doi:10.1103/physreva.95.023822

Cited by 24 publications

(13 citation statements)

References 54 publications

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“…The contribution of thermo-refractive noise on the fre-quency noise PSD of the comb lines can be effectively suppressed by e.g. laser cooling [16,43], cavity dispersion engineering [44] or operation at cryogenic temperatures [45]. Here we show that the laser cooling technique is also compatible with the reduction of the fundamental linewidth described in the previous subsection.…”

Section: Linewidth Reduction and Effective Linewidthsupporting

confidence: 64%

Fundamental optical linewidth of soliton microcombs

Lei

Fülöp

et al. 2021

Preprint

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Soliton microcombs provide a versatile platform for realizing fundamental studies and technological applications. To be utilized as frequency rulers for precision metrology, soliton microcombs must display broadband phase coherence, a parameter characterized by the optical phase or frequency noise of the comb lines and their corresponding optical linewidths. Here, we analyze the optical phase-noise dynamics in soliton microcombs and show that, because of the Raman self-frequency shift, the fundamental linewidth of some of the comb lines can, surprisingly, be narrower than the linewidth of the pump laser. This work elucidates information about the ultimate limits in phase coherence of soliton microcombs and illustrates a new strategy for the generation of spectrally coherent light on chip.

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Section: Linewidth Reduction and Effective Linewidthsupporting

confidence: 64%

Fundamental optical linewidth of soliton microcombs

Lei

Fülöp

et al. 2021

Preprint

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“…Comparing the cooled SBS laser to the auxiliary laser's frequency noise, we observe that the correction limit is only reached at low offset frequencies. For offset frequencies above 10 Hz, the cooled SBS laser noise gradually rises above the correction limit, which we attribute to be due to a rolloff in the thermal response [24].…”

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confidence: 84%

“…Recently, it was shown that the thermal noise of a microresonator frequency comb could be stabilized through the use of an independent auxiliary laser coupled into the cavity. The coupled power of the auxiliary laser induces a counteracting thermal force that reduced the linewidth of the carrier-envelope offset beat from 2.2 MHz to 280 kHz [24,38]. We demonstrate an analogous method here for our case of a Hertz-class linewidth SBS laser, utilizing an auxiliary laser to dampen the thermal motion of the optical mode.…”

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confidence: 93%

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Cooling of an Integrated Brillouin Laser below the Thermal Limit

Loh,

Kharas,

Maxson

et al. 2021

Preprint

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Photonically integrated resonators are promising as a platform for enabling ultranarrow linewidth lasers in a compact form factor. Owing to their small size, these integrated resonators suffer from thermal noise that limits the frequency stability of the optical mode to ∼100 kHz. Here, we demonstrate an integrated stimulated Brillouin scattering (SBS) laser based on a large modevolume annulus resonator that realizes an ultranarrow thermal-noise-limited linewidth of 270 Hz.In practice, yet narrower linewidths are required before integrated lasers can be truly useful for applications such as optical atomic clocks, quantum computing, gravitational wave detection, and precision spectroscopy. To this end, we employ a thermorefractive noise suppression technique utilizing an auxiliary laser to reduce our SBS laser linewidth to 70 Hz. This demonstration showcases the possibility of stabilizing the thermal motion of even the narrowest linewidth chip lasers to below 100 Hz, thereby opening the door to making integrated microresonators practical for the most demanding future scientific endeavors.

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“…dT is the thermal tuning of the cavity modes, and δ(τ ) is the Dirac delta function27 . Defining the thermal decoherence time, 1/Γ T , leads to a time-domain interpretation of how a soliton is affected by thermal noise.…”

mentioning

confidence: 99%

Thermal decoherence and laser cooling of Kerr-microresonator solitons (Conference Presentation)

Drake

Stone

Briles

et al. 2020

Photonic Heat Engines: Science and Applications II

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Thermal noise is ubiquitous in microscopic systems and in high-precision measurements. Controlling thermal noise, especially using laser light to apply dissipation, substantially affects science in revealing the quantum regime of gases 1 , in searching for fundamental physics 2 , and in realizing practical applications 3 . Recently, nonlinear light-matter interactions in microresonators have opened up new classes of microscopic devices. A key example is Kerrmicroresonator frequency combs 4 ; so-called soliton microcombs not only explore nonlinear science but also enable integrated-photonics devices, such as optical synthesizers 5 , optical clocks 6 , and data-communications systems 7 . Here, we explore how thermal noise leads to fundamental decoherence of soliton microcombs. We show that a particle-like soliton exists in a state of thermal equilibrium with its silicon-chip-based resonator. Therefore the soliton microcomb's modal linewidth is thermally broadened. Our experiments utilize record sensitivity in carrier-envelope-offset frequency detection in order to uncover this regime of strong thermal-noise correlations. Furthermore, we have discovered that passive laser cooling of the soliton reduces thermal decoherence to far below the ambient-temperature limit. We implement laser cooling by microresonator photothermal forcing, and we observe cooling of the frequency-comb light to an effective temperature of 84 K. Our work illuminates inherent connections between nonlinear photonics, microscopic physical fluctuations, and precision metrology that could be harnessed for innovative devices and methods to manipulate light.

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Squeezing the fundamental temperature fluctuations of a high-Qmicroresonator

Cited by 24 publications

References 54 publications

Fundamental optical linewidth of soliton microcombs

Fundamental optical linewidth of soliton microcombs

Cooling of an Integrated Brillouin Laser below the Thermal Limit

Thermal decoherence and laser cooling of Kerr-microresonator solitons (Conference Presentation)

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