Ultralow Noise Optical Frequency Combs

Endo, Mamoru; Shoji, Tyko D.; Schibli, Thomas R.

doi:10.1109/jstqe.2018.2818461

Cited by 60 publications

(20 citation statements)

References 112 publications

(140 reference statements)

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“…Starting with MLL OFCs, in the absence of active stabilization,

and

would be free to drift or fluctuate due to changes in the cavity length, refractive index of laser optics, and Kerr-type nonlinear effects [ 57 , 58 , 59 ].

stabilization is commonly implemented by acting on the laser cavity length via a mirror mounted on an intra-cavity piezo-electric transducer.…”

Section: Infrared Frequency Combs For Molecular Spectroscopymentioning

confidence: 99%

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Amato

Sarno

Aiello

et al. 2020

IJMS

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We review the recent developments in precision ro-vibrational spectroscopy of buffer-gas-cooled neutral molecules, obtained using infrared frequency combs either as direct probe sources or as ultra-accurate optical rulers. In particular, we show how coherent broadband spectroscopy of complex molecules especially benefits from drastic simplification of the spectra brought about by cooling of internal temperatures. Moreover, cooling the translational motion allows longer light-molecule interaction times and hence reduced transit-time broadening effects, crucial for high-precision spectroscopy on simple molecules. In this respect, we report on the progress of absolute frequency metrology experiments with buffer-gas-cooled molecules, focusing on the advanced technologies that led to record measurements with acetylene. Finally, we briefly discuss the prospects for further improving the ultimate accuracy of the spectroscopic frequency measurement.

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“…Starting with MLL OFCs, in the absence of active stabilization,

and

would be free to drift or fluctuate due to changes in the cavity length, refractive index of laser optics, and Kerr-type nonlinear effects [ 57 , 58 , 59 ].

stabilization is commonly implemented by acting on the laser cavity length via a mirror mounted on an intra-cavity piezo-electric transducer.…”

Section: Infrared Frequency Combs For Molecular Spectroscopymentioning

confidence: 99%

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Amato

Sarno

Aiello

et al. 2020

IJMS

View full text Add to dashboard Cite

show abstract

“…For f ceo stabilization, in most cases, an f − 2f interferometer is commonly used for f ceo detection. In this case, the f ceo signal is also referenced to a radio reference and able to inherit its stability [20,21] . Besides this, the phase noise of f ceo could be reduced passively or by phase locking to the laser's f rep as well [22,23] .…”

Section: Introductionmentioning

confidence: 99%

Fiber-delay-line-referenced optical frequency combs: three stabilization schemes

et al. 2022

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We demonstrate the stabilization of an optical frequency comb (OFC) using a segment of fiber delay line as a reference. A mode-locked Er-doped fiber laser is phase locked to a kilometer-long fiber delay line using three different schemes. The short-term stability of the comb modes in the OFC stabilized by these schemes is obviously enhanced, down to the 10 −12 level at millisecond average time. Among these three schemes, phase locking two bunches of comb modes in the OFC to the same fiber delay line exhibits the lowest residual phase noise. Fiber-delay-line-referenced OFCs can provide reliable laser sources in precise metrology owing to the advances of low cost, compactness, and high integration.

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“…Therefore, the relative level of shot noise is increased. According to nonlinear amplitude-to-phase coupling within the * alfred.leitenstorfer@uni-konstanz.de dielectric waveguides, mode-locked fiber lasers suffer from significant free-running phase noise of both CEO and repetition frequencies [17,18]. The latter is often referred to as timing jitter, i.e., shot-to-shot phase fluctuations of f rep .…”

Section: Introductionmentioning

confidence: 99%

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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Ultralow Noise Optical Frequency Combs

Cited by 60 publications

References 112 publications

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Fiber-delay-line-referenced optical frequency combs: three stabilization schemes

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

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