A. Douglas Stone

A. Douglas Stone

Yale University

H-index: 73

North America-United States

About A. Douglas Stone

A. Douglas Stone, With an exceptional h-index of 73 and a recent h-index of 35 (since 2020), a distinguished researcher at Yale University, specializes in the field of optics, quantum transport, condensed matter physics.

His recent articles reflect a diverse array of research interests and contributions to the field:

Exploiting spacetime symmetry in dissipative nonlinear multimode amplifiers for output control

Generating and processing optical waveforms using spectral singularities

Anti-laser shows how to make waves behave

Experimentally-realizable PT phase transitions in reflectionless quantum systems

Mitigating TMI using Multimode Excitation in Fiber Amplifiers with Gain Saturation

Beyond CPA: A General Theory of Reflectionless Scattering

Theory of stimulated Brillouin scattering in fibers for highly multimode excitations

Non-Hermitian optics and photonics: from classical to quantum

A. Douglas Stone Information

University

Yale University

Position

Professor of Applied Physics and Physics

Citations(all)

28355

Citations(since 2020)

8040

Cited By

23168

hIndex(all)

73

hIndex(since 2020)

35

i10Index(all)

147

i10Index(since 2020)

84

Email

University Profile Page

Yale University

A. Douglas Stone Skills & Research Interests

optics

quantum transport

condensed matter physics

Top articles of A. Douglas Stone

Exploiting spacetime symmetry in dissipative nonlinear multimode amplifiers for output control

Authors

Chun-Wei Chen,Kabish Wisal,Mathias Fink,A Douglas Stone,Hui Cao

Journal

arXiv preprint arXiv:2402.10345

Published Date

2024/2/15

Time-reversal symmetry enables shaping input waves to control output waves in many linear and nonlinear systems; however energy dissipation violates such symmetry. We consider a saturated multimode fiber amplifier in which light generates heat flow and suffers nonlinear thermo-optical scattering, breaking time-reversal symmetry. We identify a spacetime symmetry which maps the target output back to an input field. This mapping employs phase conjugation, gain and absorption substitution but not time reversal, and holds in steady-state and for slowly varying inputs. Our results open the possibility of output control of a saturated multimode fiber amplifier.

Generating and processing optical waveforms using spectral singularities

Authors

Asaf Farhi,Alexander Cerjan,A Douglas Stone

Journal

Physical Review A

Published Date

2024/1/22

We show that a laser at threshold can be utilized to generate the class of coherent and transform-limited waveforms (v t− z) m e i (k z− ω t) at optical frequencies. We derive these properties analytically and demonstrate them in semiclassical time-domain laser simulations. We then utilize these waveforms to expand other waveforms with high modulation frequencies and demonstrate theoretically the feasibility of complex-frequency coherent absorption at optical frequencies, with efficient energy transduction and cavity loading. This approach has potential applications in quantum computing, photonic circuits, and biomedicine.

Anti-laser shows how to make waves behave

Authors

A Douglas Stone

Journal

Nature Physics

Published Date

2024/1

A decade ago, the anti-laser made waves as a new type of perfect absorber that functions as a one-way trap door for light. Experiments have now demonstrated the control of light without absorbing it.

Experimentally-realizable PT phase transitions in reflectionless quantum systems

Authors

Micheline Soley,Carl Bender,A Douglas Stone

Journal

APS March Meeting Abstracts

Published Date

2023

Although parity-time (PT) reversal symmetry has been measured in classical wave equations, the fundamental physical symmetry has yet to be measured in lossless fundamental quantum mechanics, where PT-symmetry theory was originally developed. We show theoretically that standard cold-atom experiments with programmable traps could be used to observe both eigenstates of PT-symmetric systems and PT-symmetry breaking behavior in fundamental quantum scattering systems. We demonstrate that weakly bound states predicted for the upside-down PT-symmetric potentials V (x)=-x 4,-x 6,-x 8 can be measured to arbitrarily high accuracy as reflectionless states in the truncated purely real potential V (x)=-| x| p for positive parameter p. Quantum scattering calculations indicate the measurements are robust to experimental error. In addition, spontaneous PT-symmetry-breaking can be measured as a function of …

Mitigating TMI using Multimode Excitation in Fiber Amplifiers with Gain Saturation

Authors

Kabish Wisal,Chun-Wei Chen,Hui Cao,A Douglas Stone

Published Date

2023/5/7

We present a theory of TMI threshold for highly multimode excitations in fiber amplifiers with gain saturation. We show TMI threshold increases 6-fold when all 30-modes are excited equally in a 2D waveguide, compared to fundamental mode-only excitation.

Beyond CPA: A General Theory of Reflectionless Scattering

Authors

A Douglas Stone,WR Sweeney,C-W Hsu,A Alhulaymi,P del Hougne

Published Date

2023/7/18

Coherent Perfect Absorption is one form of reflectionless scattering, involving transduction of an adapted input field. We present a general theory of reflectionless scattering, which includes CPA, based on choosing a subset of input channels and requiring no backscattering into them. We show that infinitely many such solutions exist at complex frequency, can be calculated efficiently, and can be made accessible via tuning a single structural parameter. Optimization of a parameterized structure can achieve high quality signal routing. © 2023, META Conference. All rights reserved.

Theory of stimulated Brillouin scattering in fibers for highly multimode excitations

Authors

Kabish Wisal,Stephen C Warren-Smith,Chun-Wei Chen,Hui Cao,A Douglas Stone

Journal

arXiv preprint arXiv:2304.09342

Published Date

2023/4/18

Stimulated Brillouin scattering (SBS) is an important nonlinear optical effect which can both enable and impede optical processes in guided wave systems. Highly multi-mode excitation of fibers has been proposed as a novel route towards efficient suppression of SBS in both active and passive fibers. To study the effects of multimode excitation generally, we develop a theory of SBS for arbitrary input excitations, fiber cross section geometries and refractive index profiles. We derive appropriate nonlinear coupled mode equations for the signal and Stokes modal amplitudes starting from vector optical and tensor acoustic equations. Using applicable approximations, we find an analytical formula for the SBS (Stokes) gain susceptibility, which takes into account the vector nature of both optical and acoustic modes exactly. We show that upon multimode excitation, the SBS power in each Stokes mode grows exponentially with a growth rate that depends parametrically on the distribution of power in the signal modes. Specializing to isotropic fibers we are able to define and calculate an effective SBS gain spectrum for any choice of multimode excitation. The peak value of this gain spectrum determines the SBS threshold, the maximum SBS-limited power that can be sent through the fiber. We show theoretically that peak SBS gain is greatly reduced by highly multimode excitation due to gain broadening and relatively weaker intermodal SBS gain. We demonstrate that equal excitation of the 160 modes of a commercially available, highly multimode circular step index fiber raises the SBS threshold by a factor of 6.5, and find comparable suppression of SBS in …

Non-Hermitian optics and photonics: from classical to quantum

Authors

Changqing Wang,Zhoutian Fu,Wenbo Mao,Jinran Qie,A Douglas Stone,Lan Yang

Published Date

2023/6/30

Non-Hermitian optics is a burgeoning field at the intersection of quantum physics, electrodynamics, and nanophotonics. It provides a new perspective of the role of gain and loss in optical systems. Leveraging the advanced designs inspired by non-Hermitian physics, classical optical platforms have been widely investigated to unveil novel physical concepts, such as parity-time symmetry and exceptional points, which have no counterparts in the conventional Hermitian settings. These investigations have yielded a plethora of new phenomena in optical wave scattering, optical sensing, and nonlinear optical processes. Non-Hermitian effects also have a profound impact on the lasing behaviors in the semiclassical framework of lasers, allowing for novel ways to engineer single-mode lasers, chiral laser emission, laser noise, linewidth, etc. Furthermore, over recent years, there has been increasing interest in the …

Optimal input excitation for SBS suppression in multimode fibers

Authors

Kabish Wisal,Chun-Wei Chen,Zeyu Kuang,Stephen C Warren-Smith,Owen D Miller,Hui Cao,A Douglas Stone

Published Date

2023/3/20

Multimode fibers provide a promising platform to efficiently suppress Stimulated Brillouin Scattering (SBS) by controlling input excitation. We demonstrate SBS suppression can be formulated as a problem of optimization of the input power distribution among the fiber modes. We provide a method to obtain the optimal power distribution based on linear programming. The SBS growth rate depends linearly on the input power distribution, allowing us to map SBS suppression into a constrained linear optimization, solvable numerically. We show that for a highly multimode step index fiber, optimal input excitation gives 9.5 times higher SBS threshold compared to fundamental mode-only excitation.

Suppressing Stimulated Brillouin Scattering with High Beam Quality by Selective Multimode Excitation in Optical Fibers

Authors

Chun-Wei Chen,Kabish Wisal,Stephen Warren-Smith,Peyman Ahmadi,A Douglas Stone,Hui Cao

Published Date

2023/6/26

For many applications of high-power delivery through optical fibers and fiber amplifiers, high average power and high beam quality are both needed but difficult to meet simultaneously. This is because high-power operation requires a large fiber core to minimize nonlinear effects, but a large core usually supports many modes — it is a general belief that high output-beam quality requires single-mode operation. The power scaling for narrowband fiber amplifiers is often limited by the stimulated Brillouin scattering (SBS), which introduces high transmission loss and can induce strong backward-propagating Stokes light that damage upstream lasers. Various techniques have been developed to suppress SBS and strive to maintain single-mode operation to ensure beam quality simultaneously. If good beam quality can be attained, multimode fibers (MMF) are highly desirable because the SBS can be greatly suppressed …

Transverse mode instability suppression using wavefront shaping in multimode fiber amplifiers

Authors

Kabish Wisal,Chun-Wei Chen,Hui Cao,A Douglas Stone

Published Date

2023/3/9

Transverse Mode Instability (TMI) is one of several nonlinear effects that limit power scaling in high power fiber lasers and amplifiers. We demonstrate that TMI can be effectively suppressed by spreading power in multiple modes of the fiber. We show that the TMI threshold scales linearly with the number of modes, upon equal excitation of modes, caused by smearing of thermally induced refractive index grating. The multimode excitation can be focused to a diffraction limited spot, giving high quality beam with increased TMI threshold. We finally show linear scaling of TMI threshold is maintained upon inclusion of gain saturation.

Experimentally Realizable Phase Transitions in Reflectionless Quantum Scattering

Authors

Micheline B Soley,Carl M Bender,A Douglas Stone

Journal

Physical Review Letters

Published Date

2023/6/22

Above-barrier quantum scattering with truncated real potentials V (x)=−| x| p provides an experimentally accessible platform that exhibits spontaneous parity-time symmetry breaking as p is varied. The unbroken phase has reflectionless states that correspond to bound states in the continuum of the nontruncated potentials at arbitrarily high discrete real energies. In the fully broken phase there are no bound states. There is a mixed phase in which exceptional points occur at specific energies and values of p. These effects should be observable in cold-atom scattering experiments.

Mitigating stimulated Brillouin scattering in multimode fibers with focused output via wavefront shaping

Authors

Chun-Wei Chen,Linh V Nguyen,Kabish Wisal,Shuen Wei,Stephen C Warren-Smith,Ori Henderson-Sapir,Erik P Schartner,Peyman Ahmadi,Heike Ebendorff-Heidepriem,A Douglas Stone,David J Ottaway,Hui Cao

Journal

Nature Communications

Published Date

2023/11/13

The key challenge for high-power delivery through optical fibers is overcoming nonlinear optical effects. To keep a smooth output beam, most techniques for mitigating optical nonlinearities are restricted to single-mode fibers. Moving out of the single-mode paradigm, we show experimentally that wavefront-shaping of coherent input light to a highly multimode fiber can increase the power threshold for stimulated Brillouin scattering (SBS) by an order of magnitude, whilst simultaneously controlling the output beam profile. The SBS suppression results from an effective broadening of the Brillouin spectrum under multimode excitation, without broadening of transmitted light. Strongest suppression is achieved with selective mode excitation that gives the broadest Brillouin spectrum. Our method is efficient, robust, and applicable to continuous waves and pulses. This work points toward a promising route for mitigating …

Reflectionless programmable signal routers

Authors

Jérôme Sol,Ali Alhulaymi,A Douglas Stone,Philipp del Hougne

Journal

Science Advances

Published Date

2023/1/25

We demonstrate experimentally that reflectionless scattering modes (RSMs), a generalized version of coherent perfect absorption, can be functionalized to perform reflectionless programmable signal routing. We achieve versatile programmability both in terms of operating frequencies and routing functionality with negligible reflection upon in-coupling, which avoids unwanted signal power echoes in radio frequency or photonic networks. We report in situ observations of routing functionalities like wavelength demultiplexing, including cases where multichannel excitation requires adapted coherent input wavefronts. All experiments are performed in the microwave domain based on the same irregularly shaped cavity with strong modal overlap that is massively parametrized by a 304–element-programmable metasurface. RSMs in our highly overdamped multiresonance transport problem are fundamentally intriguing …

Suppressing transverse mode instability through multimode excitation in a fiber amplifier

Authors

Chun-Wei Chen,Kabish Wisal,Yaniv Eliezer,A Douglas Stone,Hui Cao

Journal

Proceedings of the National Academy of Sciences

Published Date

2023/5/30

High-power fiber laser amplifiers have enabled an increasing range of applications in industry, science, and defense. The power scaling for fiber amplifiers is currently limited by transverse mode instability. Most techniques for suppressing the instability are based on single- or few-mode fibers in order to output a clean collimated beam. Here, we study theoretically using a highly multimode fiber amplifier with many-mode excitation for efficient suppression of thermo-optical nonlinearity and instability. We find that the mismatch of characteristic length scales between temperature and optical intensity variations across the fiber generically leads to weaker thermo-optical coupling between fiber modes. Consequently, the transverse mode instability (TMI) threshold power increases linearly with the number of equally excited modes. When the frequency bandwidth of a coherent seed laser is narrower than the spectral …

Theory of transverse mode instability in fiber amplifiers with multimode excitations

Authors

Kabish Wisal,Chun-Wei Chen,Hui Cao,A Douglas Stone

Journal

arXiv preprint arXiv:2308.11599

Published Date

2023/8/22

Transverse Mode Instability (TMI) which results from dynamic nonlinear thermo-optical scattering is the primary limitation to power scaling in high-power fiber lasers and amplifiers. It has been proposed that TMI can be suppressed by exciting multiple modes in a highly multimode fiber. We derive a semi-analytic frequency-domain theory of the threshold for the onset of TMI under arbitrary multimode input excitation for general fiber geometries. We show that TMI results from exponential growth of noise in all the modes at downshifted frequencies due to the thermo-optical coupling. The noise growth rate in each mode is given by the sum of signal powers in various modes weighted by pairwise thermo-optical coupling coefficients. We calculate thermo-optical coupling coefficients for all pairs of modes in a standard circular multimode fiber and show that modes with large transverse spatial frequency mismatch are weakly coupled resulting in a banded coupling matrix. This short-range behavior is due to the diffusive nature of the heat propagation which mediates the coupling and leads to a lower noise growth rate upon multimode excitation compared to single mode, resulting in significant TMI suppression. We find that the TMI threshold increases linearly with the number of modes that are excited, leading to more than an order of magnitude increase in the TMI threshold in a 82-mode fiber amplifier. Using our theory, we also calculate TMI threshold in fibers with non-circular geometries upon multimode excitation and show the linear scaling of TMI threshold to be a universal property of different fibers.

Suppressing stimulated brillouin scattering by selective mode excitation in multimode fibers

Authors

Chun-Wei Chen,Kabish Wisal,Peyman Ahmadi,A Douglas Stone,Hui Cao

Published Date

2022/5/15

We experimentally demonstrate efficient suppression of stimulated Brillouin scattering in multimode fibers. By distributing the power in a number of high-order modes, the SBS threshold is three times as much as that for fundamental-mode-only excitation.

Nonlinear exceptional-point lasing with ab initio Maxwell–Bloch theory

Authors

Mohammed Benzaouia,AD Stone,Steven G Johnson

Journal

APL Photonics

Published Date

2022/12/1

We present a general analysis for finding and characterizing nonlinear exceptional point (EP) lasers above threshold using steady-state ab initio Maxwell–Bloch equations. For a system of coupled slabs, we show that a nonlinear EP is obtained for a given ratio between the external pumps in each resonator and that it is associated with a kink in the output power and lasing frequency, confirming coupled-mode theory predictions. Through numerical linear stability analysis, we confirm that the EP laser can be stable for a large enough inversion relaxation rate. We further show that the EP laser can be characterized by scattering a weak signal off the lasing cavity so that the scattering frequency spectrum exhibits a quartic divergence. Our approach can be applied to arbitrary scatterers with multi-level gain media.

Suppressing Stimulated Brillouin Scattering in Multimode Fibers via Wavefront shaping

Authors

Kabish Wisal,Chun-Wei Chen,Stephen Warrensmith,Hui Cao,A Douglas Stone

Published Date

2022/10/17

We demonstrate theoretically that SBS threshold can be increased significantly by many-mode excitations in multimode fibers. We experimentally focus multimode excitation to a diffraction limited spot, leading to high SBS threshold with good beam quality.

Suppressing stimulated Brillouin scattering through higher order mode excitation in a multimode fiber

Authors

Stephen C Warren-Smith,Kabish Wisal,Chun-Wei Chen,A Douglas Stone,Linh V Nguyen,Ori Henderson-Sapir,David Ottaway,Heike Ebendoff-Heidepriem,Hui Cao

Published Date

2022/8/31

We numerically and experimentally demonstrate that spreading power into higher order modes of a multimode optical fiber can be used to suppress stimulated Brillouin scattering for a high-power narrow linewidth system. This opens the opportunity for suppressing nonlinear effects in fibers using adaptive mode launching techniques while retaining the ability to produce spatially coherent beams through control of the light phase.

See List of Professors in A. Douglas Stone University(Yale University)

A. Douglas Stone FAQs

What is A. Douglas Stone's h-index at Yale University?

The h-index of A. Douglas Stone has been 35 since 2020 and 73 in total.

What are A. Douglas Stone's top articles?

The articles with the titles of

Exploiting spacetime symmetry in dissipative nonlinear multimode amplifiers for output control

Generating and processing optical waveforms using spectral singularities

Anti-laser shows how to make waves behave

Experimentally-realizable PT phase transitions in reflectionless quantum systems

Mitigating TMI using Multimode Excitation in Fiber Amplifiers with Gain Saturation

Beyond CPA: A General Theory of Reflectionless Scattering

Theory of stimulated Brillouin scattering in fibers for highly multimode excitations

Non-Hermitian optics and photonics: from classical to quantum

...

are the top articles of A. Douglas Stone at Yale University.

What are A. Douglas Stone's research interests?

The research interests of A. Douglas Stone are: optics, quantum transport, condensed matter physics

What is A. Douglas Stone's total number of citations?

A. Douglas Stone has 28,355 citations in total.

What are the co-authors of A. Douglas Stone?

The co-authors of A. Douglas Stone are Hui Cao, Harold U Baranger, Yidong Chong, Stefan Rotter, Hakan E Türeci, Rodolfo A. Jalabert.

    Co-Authors

    H-index: 79
    Hui Cao

    Hui Cao

    Yale University

    H-index: 61
    Harold U Baranger

    Harold U Baranger

    Duke University

    H-index: 55
    Yidong Chong

    Yidong Chong

    Nanyang Technological University

    H-index: 50
    Stefan Rotter

    Stefan Rotter

    Technische Universität Wien

    H-index: 44
    Hakan E Türeci

    Hakan E Türeci

    Princeton University

    H-index: 37
    Rodolfo A. Jalabert

    Rodolfo A. Jalabert

    Université de Strasbourg

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