Observation of Quantum Phase Fluctuations in Infrared Gas Lasers

Manes, K. R.; Siegman, A. E.

doi:10.1103/physreva.4.373

Cited by 65 publications

(11 citation statements)

References 16 publications

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“…Siegman has previously suggested that the incomplete inversion factor might lead to deviations from the strict inverse dependence of the laser linewidth upon the output power, but was unable to test this hypothesis [51]. We note that it is important in these comparisons to calculate the output power from its fundamental definition via Poynting's theorem [52],…”

Section: Resultsmentioning

confidence: 84%

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Quantitative test of general theories of the intrinsic laser linewidth

et al. 2015

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We perform a first-principles calculation of the quantum-limited laser linewidth, testing the predictions of recently developed theories of the laser linewidth based on fluctuations about the known steady-state laser solutions against traditional forms of the Schawlow-Townes linewidth. The numerical study is based on finite-difference time-domain simulations of the semiclassical Maxwell-Bloch lasing equations, augmented with Langevin force terms, and includes the effects of dispersion, losses due to the open boundary of the laser cavity, and non-linear coupling between the amplitude and phase fluctuations (α factor). We find quantitative agreement between the numerical results and the predictions of the noisy steady-state ab initio laser theory (N-SALT), both in the variation of the linewidth with output power, as well as the emergence of side-peaks due to relaxation oscillations.

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Section: Resultsmentioning

confidence: 84%

“…The overall intensity of the electric field enters directly into the linewidth formulas only through the output power, Eq. (51). SALT demonstrates that the electric field can be written in terms of dimensionless units, E 0 (x) = (h √ γ ⊥ γ /2θ )E SALT (x) [22,53], and thus the output power can also be written as,…”

Section: Linewidth Scaling Relationsmentioning

confidence: 99%

Quantitative test of general theories of the intrinsic laser linewidth

et al. 2015

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“…Considering the fact that slow phase fluctuations can be technically compensated 8,54 , noise spectra at low frequencies are not always of concern while the intrinsic linewidth characteristic associated with fundamental limits is non-trivially paid extensive attentions; for instance, the intrinsic linewidth governed by diverse phase noise dynamics were intensively studied in a plenty of lasers involving various gain mechanisms such as gas laser 55 , fibre laser 56 , semiconductor laser 10,39 , quantum cascade laser 9,32 , photonic integrated laser 13 and micro-resonator laser 57 . To demonstrate the different phase noise dynamics of lasers with various gain mechanism, we have experimentally measured the delay-time-resolved phase jitter variance of a fiber laser compared to that of an external cavity semiconductor laser, which are presented in Supplementary Figure S1.…”

Section: Discussionmentioning

confidence: 99%

Unveiling delay-time-resolved phase noise statistics of narrow-linewidth laser via coherent optical time domain reflectometry

2020

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Laser with high spectral purity plays a crucial role in high-precision optical metrology and coherent communication. Thanks to the rapid development of laser frequency stabilization, the laser phase noise can be remarkably compensated, allowing its ultra-narrow linewidth subject to mostly quantum limit. Nevertheless, the accurate characterization of phase noise dynamics and its intrinsic linewidth of a highly coherent laser remains ambiguous and challenging. Here, we present an approach capable of revealing delay-time-resolved phase noise dynamics of a coherent laser based on coherent optical time domain reflectometry (COTDR), in which distributed Rayleigh scattering along a delay fibre essentially allows a timeof-flight mapping of a heterodyne beating signal associated with delay-timedependent phase information from a single laser source. Ultimately, this novel technique facilitates a precise measurement of ultra-narrow laser linewidth by exploiting its delay-time-resolved phase jitter statistics, confirmed with the analytical modelling and numerical simulations. Correspondence should be addressed to L. Z. ( * email: opticaliang@gmail.com ) or to X. B. ( § email: xbao@uottawa.ca )

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“…Separation of technical noise from fundamental quantum fluctuations in the amplitude and phase noise of the laser was a problem of early interest for the experimen- talist [34]. The so-called Schawlow-Townes linewidth of the maser and/or laser is that which is limited by spontaneous emission of atoms in the lasing medium.…”

Section: B Maser Phase Diffusion and Linewidthmentioning

confidence: 99%

Micromaser and separated-oscillatory-field measurements

et al. 1992

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The connection between proposed experiments involving a micromaser and the Ramsey technique of separated oscillatory fields is explored, speci%cally with regard to possible experiments to measure the phase-difFusion linewidth of the maser. A method of detecting the trapping states and a setup to identify the two-level system as being a true spin-~system are presented. In addition, a pictorial view of the time evolution of the atomic Bloch vector is given.PACS number(s): 42.52.+x, 32.80.t, 42.50.Dv

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Observation of Quantum Phase Fluctuations in Infrared Gas Lasers

Cited by 65 publications

References 16 publications

Quantitative test of general theories of the intrinsic laser linewidth

Quantitative test of general theories of the intrinsic laser linewidth

Unveiling delay-time-resolved phase noise statistics of narrow-linewidth laser via coherent optical time domain reflectometry

Micromaser and separated-oscillatory-field measurements

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