Deterministic Nonlinear Transformations of Phase Noise in Quantum-Limited Frequency Combs

Liehl, Andreas; Sulzer, Philipp; Fehrenbacher, David; Rybka, Tobias; Seletskiy, Denis V.; Leitenstorfer, Alfred

doi:10.1103/physrevlett.122.203902

Cited by 19 publications

(24 citation statements)

References 43 publications

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“…To retain the phase coherence of the fundamental laser in the UV range, only the second and third strategy are appropriate here [40], and only the third is likely to yield the high power needed for remote-sensing applications. The PSD of the optical phase noise is quadratic in harmonic order k leading to a linear increase of the optical phase noise RMS with k [41]. Verification of the coherence transfer in bulk crystals has been demonstrated experimentally in a DCS type experiment [42].…”

Section: Uv-dcs Laser Sourcesmentioning

confidence: 92%

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

2020

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The development of increasingly sensitive and robust instruments and new methodologies are essential to improve our understanding of the Earth’s climate and air pollution. In this context, Dual-Comb spectroscopy (DCS) has been successfully demonstrated as a remote laser-based instrument to probe infrared absorbing species such as greenhouse gases. We present here a study of the sensitivity of Dual-Comb spectroscopy to remotely monitor atmospheric gases focusing on molecules that absorb in the ultraviolet domain, where the most reactive molecules of the atmosphere (OH, HONO, BrO...) have their highest absorption cross-sections. We assess the achievable signal-to-noise ratio (SNR) and the corresponding minimum absorption sensitivity of DCS in the ultraviolet range. We propose a potential light source for remote sensing UV-DCS and discuss the degree of immunity of UV-DCS to atmospheric turbulences. We show that the characteristics of the currently available UV sources are compatible with the unambiguous identification of UV absorbing gases by UV-DCS.

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Section: Uv-dcs Laser Sourcesmentioning

confidence: 92%

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

2020

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“…(ii) Noise during the spectral broadening in the nonlinear fibers [16,17,53] and during frequency doubling [54]. Further investigations will be necessary to single out these contributions.…”

Section: Resultsmentioning

confidence: 99%

End-to-end topology for fiber comb based optical frequency transfer at the 10⁻²¹level

et al. 2019

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We introduce a simple and robust scheme for optical frequency transfer of an ultra-stable source light field via an optical frequency comb to a field at a target optical frequency, where highest stability is required, e.g. for the interrogation of an optical clock. The scheme relies on a topology for end-to-end suppression of the influence of optical path-length fluctuations, which is attained by actively phase-stabilized delivery, combined with common-path propagation. This approach provides a robust stability improvement without the need for additional isolation against environmental disturbances such as temperature, pressure or humidity changes. We measure residual frequency transfer instabilities by comparing the frequency transfers carried out with two independent combs simultaneously. Residual fractional frequency instabilities between two systems of 8 × 10 −18 at 1 s and 3 × 10 −21 at 10 5 s averaging time are observed. We discuss the individual noise contributions to the residual instability. The presented scheme is technically simple, robust against environmental parameter fluctuations, and enables an ultra-stable frequency transfer, e.g. to optical clock lasers or to lasers in gravitational wave detectors.

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“…Although passive phase-locking yields ultralow shot-toshot carrier-envelope phase jitter [40] as well as extraordinary long-term stability, it has been realized that the optical phase noise at the initial center frequency of 193 THz, i.e., phase fluctuations on the electromagnetic carrier wave, is significantly increased [28,29]. In this section, we provide an in-depth discussion of this context adding technical and theoretical aspects which are crucial for the self-controlled stabilization scheme presented in Sec.…”

Section: Evolution Of Phase Noise During Nonlinear Frequency Convmentioning

confidence: 99%

“…Still, it has been observed phenomenologically that nonlinear frequency conversion may affect the phase noise of individual comb modes [25][26][27]. Systematic analysis of a DFG comb based on Er-doped fiber shows a detrimental influence of passive phase locking at the initial optical carrier frequency [28,29]. So far, any subsequent reduction has called for an active external reference [24,28], thus compromising the compactness and possibility of small packaging of the entire setup.…”

Section: Introductionmentioning

confidence: 99%

“…III, we characterize the longterm stability of the passively eliminated CEO frequency motivating further stabilization of our Er-doped fiber source. A detailed discussion of the physics underlying the option for self-control, namely, deterministic multiplication of the intrinsic timing jitter during coherent spectral broadening and DFG [29], is presented in experiment and theory in Sec. IV.…”

Section: Introductionmentioning

confidence: 99%

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Broadband analysis and self-control of spectral fluctuations in a passively phase-stable Er-doped fiber frequency comb

et al. 2020

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Carrier-envelope and optical phase noise of a femtosecond frequency comb based on Er-doped fiber technology is investigated and minimized without exploiting active external references. Ultrabroadband, coherent, and tailorable supercontinua are generated in a highly nonlinear germanosilicate fiber assembly. Difference frequency mixing between comb modes in their spectral extrema passively eliminates the carrier-envelope phase slip. This step generates an inherently offset-free comb with a relative frequency stability better than 10 −21. In contrast, the phase fluctuations at the carrier frequency of 193 THz are increased as compared to the fundamental comb. Their level matches the value found by parabolic extrapolation of the phase noise of the fundamental comb to zero frequency. The latter is unambiguously accessible by means of any beat note centered at the carrier-envelope offset frequency. All these findings rely on strong correlations between the comb modes that are quantitatively described by an elastic tape model, underlining the deterministic character of the processes involved. The superior optical phase noise of the fundamental comb is transferred to the difference-frequency comb while not compromising the inherent cancellation of the carrier-envelope offset frequency. In this way, the optical linewidth of the passively phase-locked comb is reduced from 100 kHz to a measured value of 5 kHz, which is limited by the cw laser reference used for out-of-loop characterization.

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Deterministic Nonlinear Transformations of Phase Noise in Quantum-Limited Frequency Combs

Cited by 19 publications

References 43 publications

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

End-to-end topology for fiber comb based optical frequency transfer at the 10⁻²¹level

Broadband analysis and self-control of spectral fluctuations in a passively phase-stable Er-doped fiber frequency comb

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Deterministic Nonlinear Transformations of Phase Noise in Quantum-Limited Frequency Combs

Cited by 19 publications

References 43 publications

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

Towards DCS in the UV Spectral Range for Remote Sensing of Atmospheric Trace Gases

End-to-end topology for fiber comb based optical frequency transfer at the 10−21level

Broadband analysis and self-control of spectral fluctuations in a passively phase-stable Er-doped fiber frequency comb

Contact Info

Product

Resources

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End-to-end topology for fiber comb based optical frequency transfer at the 10⁻²¹level