TY  - JOUR
A1  - Mittler, Kay
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Longitudinal mode structure of Nd-lasers with phase conjugating mirrors based on stimulated Brillouin scattering in different materials
Y1  - 1997
ER  - 
TY  - BOOK
A1  - Heuer, Axel
A1  - Hänisch, Christoph
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - Low Power Threshold Phase Conjugating Mirrors by SBS in Yb-doped Fiber Amplifiers
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Low threshold SBS phase conjugation for quasi-cw laser systems
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Hänisch, Christoph
A1  - Menzel, Ralf
T1  - Low-power phase conjugation based on stimulated Brillouin scattering in fiber amplifiers
Y1  - 2003
ER  - 
TY  - JOUR
A1  - Menzel, Ralf
T1  - Metrological Applications
Y1  - 2004
SN  - 3-540-20114-9
ER  - 
TY  - JOUR
A1  - Niebuhr, Mario
A1  - Zink, Christof
A1  - Jechow, Andreas
A1  - Heuer, Axel
A1  - Glebov, Leonid B.
A1  - Menzel, Ralf
T1  - Mode stabilization of a laterally structured broad area diode laser using an external volume Bragg grating
JF  - Optics express : the international electronic journal of optics
N2  - An external volume Bragg grating (VBG) is used for transverse and longitudinal mode stabilization of a broad area diode laser (BAL) with an on-chip transverse Bragg resonance (TBR) grating. The internal TBR grating defines a transverse low-loss mode at a specific propagation angle inside the BAL. Selection of the TBR mode was realized via the angular geometry of an external resonator assembly consisting of the TBR BAL and a feedback element. A feedback mirror provides near diffraction limited and spectral narrow output in the TBR mode albeit requiring an intricate alignment procedure. If feedback is provided via a VBG, adjustment proves to be far less critical and higher output powers were achieved. Moreover, additional modulation in the far field distribution became discernible allowing for a better study of the TBR concept. (C) 2015 Optical Society of America
Y1  - 2015
U6  - https://doi.org/10.1364/OE.23.012394
SN  - 1094-4087
VL  - 23
IS  - 9
SP  - 12394
EP  - 12400
PB  - Optical Society of America
CY  - Washington
ER  - 
TY  - JOUR
A1  - Zink, Christof
A1  - Werner, Nils
A1  - Jechow, Andreas
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Multi-wavelength operation of a single broad area diode laser by spectral beam combining
JF  - IEEE photonics technology letters
N2  - Stabilized multi-wavelength emission from a single emitter broad area diode laser (BAL) is realized by utilizing an external cavity with a spectral beam combining architecture. Self-organized emitters that are equidistantly spaced across the slow axis are enforced by the spatially distributed wavelength selectivity of the external cavity. This resulted in an array like near-field emission although the BAL is physically a single emitter without any epitaxial sub-structuring and only one electrical contact. Each of the self-organized emitters is operated at a different wavelength and the emission is multiplexed into one spatial mode with near-diffraction limited beam quality. With this setup, multi-line emission of 31 individual spectral lines centered around and a total spectral width of 3.6 nm is realized with a 1000 mu m wide BAL just above threshold. To the best of our knowledge, this is the first demonstration of such a self-organization of emitters by optical feedback utilizing a spectral beam combining architecture.
KW  - Laser resonators
KW  - semiconductor lasers
KW  - optical feedback
Y1  - 2014
U6  - https://doi.org/10.1109/LPT.2013.2291963
SN  - 1041-1135
SN  - 1941-0174
VL  - 26
IS  - 3
SP  - 253
EP  - 256
PB  - Inst. of Electr. and Electronics Engineers
CY  - Piscataway
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Sagahti, A.
A1  - Jechow, Andreas
A1  - Skoczowsky, D.
A1  - Menzel, Ralf
T1  - Multi-wavelength, high spatial brightness operation of a phase-locked stripe-array diode laser
JF  - Laser physics
N2  - Stable continuous wave multi-wavelength operation of a stripe-array diode laser with an externalcavity spectral beam combining geometry is presented. In this setup each emitter of the stripe-array is forced to operate at a different wavelength, which leads to a decoupling between the usually phase-locked emitters. With a reflective diffraction grating with a period of 300 lines per mm, 33 equidistant laser lines around a center wavelength of 978 nm were realized, spanning a spectral range of 26 nm. With this novel approach near-diffraction limited emission with a beam quality of M (2) < 1.2 and an output power of 450 mW was achieved. This laser light source can be used for applications requiring low temporal but high spatial coherence.
Y1  - 2012
U6  - https://doi.org/10.1134/S1054660X12010057
SN  - 1054-660X
VL  - 22
IS  - 1
SP  - 160
EP  - 164
PB  - Pleiades Publ.
CY  - New York
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Lorenz, Dieter
A1  - Menzel, Ralf
T1  - Nd-laser oscillators with phase-conjugating SBS mirrors for high average output powers and fundamental mode operation
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Menzel, Ralf
A1  - Eichler, Hans Joachim
A1  - Geinitz, E.
A1  - Haase, Alfred
A1  - Scherrer, R.
T1  - Neodymium-laser with SBS phase conjugation for high beam quality
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Hänisch, Christoph
A1  - Menzel, Ralf
T1  - New concept for low threshold optical phase conjugation via SBS in a fiber amplifier
Y1  - 2003
SN  - 0-8194-4772-2
ER  - 
TY  - JOUR
A1  - Raab, Volker
A1  - Ullner, Ekkehard
A1  - Menzel, Ralf
T1  - Novel External Resonators for High Power Diode Lasers with Improved Beam Quality
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Phase conjugating SBS-mirror for low powers and reflectivities above 90 % in an internally tapered optical fiber
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Raabe, S.
A1  - Menzel, Ralf
T1  - Phase memory across two single-photon interferometers including wavelength conversion
JF  - Physical review : A, Atomic, molecular, and optical physics
N2  - Spontaneous parametric down-conversion (SPDC) in a nonlinear crystal generates two single photons (signal and idler) with random phases. Thus, no first-order interference between them occurs. However, coherence can be induced in a cascaded setup of two crystals if, e.g., the idler modes of both crystals are aligned to be indistinguishable. Due to the effect of phase memory it is found that the first-order interference of the signal beams can be controlled by the phase delay between the pump beams. Even for pump photon delays much larger than the coherence length of the SPDC photons, the visibility is above 90%. The high visibilities reported here prove an almost perfect phase memory effect across the two interferometers for the pump and the signal photon modes.
Y1  - 2014
U6  - https://doi.org/10.1103/PhysRevA.90.045803
SN  - 1050-2947
SN  - 1094-1622
VL  - 90
IS  - 4
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Raab, Volker
A1  - Menzel, Ralf
T1  - Phase-locked array of 25 broad-area lasers
Y1  - 2002
SN  - 0-8194-4368-9
ER  - 
TY  - JOUR
A1  - Menzel, Ralf
T1  - Photonics : linear and nonlinear interactions of laser light and matter
Y1  - 2007
SN  - 978-540-67074-2
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Menzel, Ralf
T1  - Photonics : Linear and nonlinear interactions of laser light and matter
Y1  - 2001
SN  - 3-540-67074-2
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Sandmann, Michael
A1  - Garz, Andreas
A1  - Menzel, Ralf
T1  - Physiological response of two different Chlamydomonas reinhardtii strains to light-dark rhythms
JF  - Botany
N2  - Cells of a cell-wall deficient line (cw15-type) of Chlamydomonas reinhardtii and of the corresponding wild type were grown during repetitive light-dark cycles. In a direct comparison, both lines showed approximately the same relative biomass increase during light phase but the cw-line produced significantly more, and smaller, daughter cells. Throughout the light period the average cellular starch content, the cellular chlorophyll content, the cellular rate of dark respiration, and the cellular rate of photosynthesis of the cw-line was lower. Despite this, several non-cell volume related parameters like the development of starch content per cell volume were clearly different over time between the strains. Additionally, the chlorophyll-based photosynthesis rates were 2-fold higher in the mutant than in the wild-type cells, and the ratio of chlorophyll a to chlorophyll b as well as the light-saturation index were also consistently higher in the mutant cells. Differences in the starch content were also confirmed by single cell analyses using a sensitive SHG-based microscopy approach. In summary, the cw15-type mutant deviates from its genetic background in the entire cell physiology. Both lines should be used in further studies in comparative systems biology with focus on the detailed relation between cell volume increase, photosynthesis, starch metabolism, and daughter cell productivity.
KW  - cell wall deficient mutant
KW  - diurnal rhythm
KW  - nonlinear microscopy
KW  - photosynthesis
KW  - single-cell analysis
Y1  - 2016
U6  - https://doi.org/10.1139/cjb-2015-0144
SN  - 1916-2790
SN  - 1916-2804
VL  - 94
SP  - 53
EP  - 64
PB  - NRC Research Press
CY  - Ottawa
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Haase, Alfred
A1  - Menzel, Ralf
T1  - Power enhancement and application of a Nd:YALO rod amplifier with a phase conjugating mirror
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Haase, Alfred
A1  - Menzel, Ralf
T1  - Power enhancement and application of a Nd:YALO rod amplifier with a phase conjugating mirror
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
A1  - Ostermeyer, Martin
T1  - Power tunable Nd-oscillators with diffraction limited beams via SBS phase conjugation
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Principles of Phase Conjugating Brillouin Mirrors
Y1  - 2004
SN  - 0-471-43957-6
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Mittler, Kay
A1  - Menzel, Ralf
T1  - Q switch and longitudinal modes of a laser oscillator with a stimulated-Brillouin-scattering mirror
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Q-switching of Nd-lasers with high repetition rates by SBS phase conjugation
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Klemz, Guido
A1  - Kubina, P.
A1  - Menzel, Ralf
T1  - Quasi-continuous-wave birefringence-compensated single- and double-rod Nd : YAG lasers
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Skoczowsky, Danilo
A1  - Jechow, Andreas
A1  - Stürmer, Herbert
A1  - Poßner, Torsten
A1  - Sacher, Joachim
A1  - Menzel, Ralf
T1  - Quasi-monolithic ring resonator for efficient frequency doubling of an external cavity diode laser
N2  - A quasi-monolithic second-harmonic-generation ring resonator assembled with miniaturized components is presented. The ring contains a 10-mm-long bulk periodically poled lithium niobate crystal for second-harmonic generation, four plane mirrors and two gradient-index lenses. All parts are mounted on a glass substrate with an overall size of 19.5 mmx8.5 mmx4 mm. As pump source a broad-area laser diode operated in an external resonator with Littrow arrangement is utilized. This external cavity diode laser provides near diffraction limited, narrow-bandwidth emission with an optical output power of 450 mW at a wavelength of 976 nm. Locking of the diode laser emission to the resonance frequency of the ring cavity was achieved by an optical self-injection locking technique. With this setup more than 126 mW of diffraction-limited blue light at 488 nm could be generated. The opto-optical conversion efficiency was 28% and a wall plug efficiency better than 5.5% could be achieved.
Y1  - 2010
UR  - http://www.springerlink.com/content/100502
U6  - https://doi.org/10.1007/s00340-009-3802-7
SN  - 0946-2171
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Watermann, V.
A1  - Menzel, Ralf
T1  - Resonators with phase conjugating SBS-mirror for solid state lasers with high output powers
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Menzel, Ralf
A1  - Sander, Rolf
A1  - Schulzke, M.
A1  - Schwartz, J.
T1  - SBS at different wavelengths between 308 and 725 nm
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Eichler, Hans Joachim
A1  - Haase, Alfred
A1  - Menzel, Ralf
T1  - SBS-Phase Conjugation for Thermal Lens Compensation in 100 Watt Average Power Solid-State Lasers
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - Single rod efficient Nd:YAG and Nd:YALO-lasers with average output powers of 46 and 47 W in diffraction limited beams with M2 < 1.2 and 100 W with M2 < 3.7
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Watermann, V.
A1  - Menzel, Ralf
T1  - Single rod Nd:laser with phase conjugating SBS-mirror and large transversal mode for average output powers above 20 Watts
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Hodgson, N.
A1  - Lorenz, Dieter
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - Solid state lasers with high brightness via optical phase conjugation for micromachining
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Lorenz, Dieter
A1  - Brandenburg, Ingo
A1  - Menzel, Ralf
T1  - Spectral broadening of the laser spectrum of gain-switched Ti:sapphire laser with nonlinear absorbers
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Jechow, Andreas
A1  - Lichtner, Mark
A1  - Menzel, Ralf
A1  - Radziunas, Mindaugas
A1  - Skoczowsky, Danilo
A1  - Vladimirov, Andrei G.
T1  - Stripe-array diode-laser in an off-axis external cavity : theory and experiment
N2  - Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles ña depending on the period of the array. In this paper a 40 emitter gain guided stripe-array laterally coupled by off-axis filtered feedback is investigated experimentally and numerically. We predict theoretically and confirm experimentally that at doubled feedback angle 2a a stable higher order supermode exists with twice the number of emitters per array period. The theoretical model is based on time domain traveling wave equations for optical fields coupled to the carrier density equation taking into account diffusion of carriers. Feedback from the external reflector is modeled using Fresnel integration.
Y1  - 2009
UR  - http://www.opticsinfobase.org/oe/Issue.cfm
U6  - https://doi.org/10.1364/OE.17.019599
SN  - 1094-4087
ER  - 
TY  - JOUR
A1  - Jechow, Andreas
A1  - Lichtner, Mark
A1  - Menzel, Ralf
A1  - Radziunas, Mindaugas
A1  - Skoczowsky, Danilo
A1  - Vladimirov, Andrei G.
T1  - Stripe-array diode-laser in an off-axis external cavity : theory and experiment
N2  - Stripe-array diode lasers naturally operate in an anti-phase supermode. This produces a sharp double lobe far field at angles +/-alpha depending on the period of the array. In this paper a 40 emitter gain guided stripe-array laterally coupled by off-axis filtered feedback is investigated experimentally and numerically. We predict theoretically and confirm experimentally that at doubled feedback angle 2 alpha a stable higher order supermode exists with twice the number of emitters per array period. The theoretical model is based on time domain traveling wave equations for optical fields coupled to the carrier density equation taking into account diffusion of carriers. Feedback from the external reflector is modeled using Fresnel integration.
Y1  - 2009
UR  - http://www.opticsexpress.org/Issue.cfm
U6  - https://doi.org/10.1364/OE.17.019599
SN  - 1094-4087
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Temporal features of SBS phase conjugation
Y1  - 2000
SN  - 0-8194-3545-7
ER  - 
TY  - JOUR
A1  - Afshaarvahid, Shahraam
A1  - Heuer, Axel
A1  - Menzel, Ralf
A1  - Munch, Jesper
T1  - Temporal structure of stimulated-Brillouin-scattering reflectivity considering transversal-mode development
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Rätzel, Dennis
A1  - Wilkens, Martin
A1  - Menzel, Ralf
T1  - The effect of entanglement in gravitational photon-photon scattering
JF  - epl : a letters journal exploring the frontiers of physics
N2  - The differential cross-section for gravitational photon-photon scattering calculated in perturbative quantum gravity is shown to depend on the degree of polarization entanglement of the two photons. The interaction between photons in the symmetric Bell state is stronger than between not entangled photons. In contrast, the interaction between photons in the anti-symmetric Bell state is weaker than between not entangled photons. The results are interpreted in terms of quantum interference, and it is shown how they fit into the idea of distance-dependent forces. Copyright (C) EPLA, 2016
Y1  - 2016
U6  - https://doi.org/10.1209/0295-5075/115/51002
SN  - 0295-5075
SN  - 1286-4854
VL  - 115
SP  - S12
EP  - S13
PB  - EDP Sciences
CY  - Mulhouse
ER  - 
TY  - JOUR
A1  - Menzel, Ralf
A1  - Marx, Robert
A1  - Puhlmann, Dirk
A1  - Heuer, Axel
A1  - Schleich, Wolfgang
T1  - The photon
BT  - the role of its mode function in analyzing complementarity
JF  - Journal of the Optical Society of America : B, Optical physics
N2  - We investigate the role of the spatial mode function in a single-photon experiment designed to demonstrate the principle of complementarity. Our approach employs entangled photons created by spontaneous parametric downconversion from a pump mode in a TEM01 mode together with a double slit. Measuring the interference of the signal photons behind the double slit in coincidence with the entangled idler photons at different positions, we select signal photons of different mode functions. When the signal photons belong to the TEM01-like double-hump mode, we obtain almost perfect visibility of the interference fringes, and no "which slit" information is available in the idler photon detected before the slits. This result is remarkable because the entangled signal and idler photon pairs are created each time in only one of the two intensity humps. However, when we break the symmetry between the two maxima of the signal photon mode structure, the paths through the slits for these additional photons become distinguishable and the visibility vanishes. It is the mode function of the photons selected by the detection system that decides if interference or "which slit" information is accessible in the experiment.
Y1  - 2019
U6  - https://doi.org/10.1364/JOSAB.36.001668
SN  - 0740-3224
SN  - 1520-8540
VL  - 36
IS  - 6
SP  - 1668
EP  - 1675
PB  - Optical Society of America
CY  - Washington
ER  - 
TY  - JOUR
A1  - Hänisch, Christoph
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Threshold reduction of stimulated Brillouin scattering (SBS) using fiber loop schemes
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Mittler, Kay
A1  - Lorenz, Dieter
A1  - Menzel, Ralf
T1  - Time resolved emission spectra of a broadband ns-laser with 0.5 W average output power used as light source for the coherence radar
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Mittler, Kay
A1  - Lorenz, Dieter
A1  - Menzel, Ralf
T1  - Time-resolved measurements of the spectra of a broadband laser used as light source for the coherence radar
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Sander, Rolf
A1  - Herrmann, V.
A1  - Menzel, Ralf
T1  - Transient absorption spectra and bleaching of 4'-n-Pentyl-4-Cyanoterphenyl in Cyclohexane : determination of cross sections and recovery times
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Elsner, Robert
A1  - Puhlmann, Dirk
A1  - Pieplow, Gregor
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Transverse distinguishability of entangled photons with arbitrarily shaped spatial near- and far-field distributions
JF  - Journal of the Optical Society of America : B, Optical physics
N2  - Entangled photons generated by spontaneous parametric downconversion are ubiquitous in quantum optics. In general, they exhibit a complex spatial photon count distribution. This spatial structure is responsible for seemingly surprising results concerning, e.g., complementarity such as the apparent simultaneous observation of interference fringes V and which-way information D at a double slit, as recently reported by Menzel et al. [Proc. Natl. Acad. Sci. USA 109, 9314 (2012)]. We implement a complete quantitative model of the SPDC interaction that fully incorporates the effects of crystal anisotropies, phase matching, and the pump beam structure and allows for arbitrary manipulations of the SPDC light in the near and far fields. This enables us to establish an upper bound D-2 + V-2 <= 1.47 for the experimental parameters reported by Menzel et al. We report new experimental results that agree excellently with these theoretical predictions. The new model enables a detailed quantitative analysis of this surprising result and the fair sampling interpretation of biphotons passing a double slit. (C) 2015 Optical Society of America
Y1  - 2015
U6  - https://doi.org/10.1364/JOSAB.32.001910
SN  - 0740-3224
SN  - 1520-8540
VL  - 32
IS  - 9
SP  - 1910
EP  - 1919
PB  - Optical Society of America
CY  - Washington
ER  - 
TY  - JOUR
A1  - Heuer, Axel
A1  - Schultheiss, J.
A1  - Hodgson, N.
A1  - Kurths, Jürgen
A1  - Menzel, Ralf
A1  - Raab, Volker
T1  - Transverse effects in phase conjugate laser mirrors based on stimulated brillouin scattering
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Lorenz, Dieter
A1  - Hodgson, N.
A1  - Menzel, Ralf
T1  - Transverse Modes in Laser Resonators with Phase Conjugating Mirror Based on Stimulated Brillouin Scattering (SBS)
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Raab, Volker
A1  - Skoczowsky, Danilo
A1  - Menzel, Ralf
T1  - Tuning high-power diodes with as much as 0.38 W of power and M2 = 1.2 over a range of 32 nm with 3-GHz bandwidth
Y1  - 2003
ER  - 
TY  - JOUR
A1  - Menzel, Ralf
A1  - Puhlmann, Dirk
A1  - Heuer, Axel
A1  - Schleich, Wolfgang P.
T1  - Wave-particle dualism and complementarity unraveled by a different mode
JF  - Proceedings of the National Academy of Sciences of the United States of America
N2  - The precise knowledge of one of two complementary experimental outcomes prevents us from obtaining complete information about the other one. This formulation of Niels Bohr's principle of complementarity when applied to the paradigm of wave-particle dualism-that is, to Young's double-slit experiment-implies that the information about the slit through which a quantum particle has passed erases interference. In the present paper we report a double-slit experiment using two photons created by spontaneous parametric down-conversion where we observe interference in the signal photon despite the fact that we have located it in one of the slits due to its entanglement with the idler photon. This surprising aspect of complementarity comes to light by our special choice of the TEM01 pump mode. According to quantum field theory the signal photon is then in a coherent superposition of two distinct wave vectors giving rise to interference fringes analogous to two mechanical slits.
Y1  - 2012
U6  - https://doi.org/10.1073/pnas.1201271109
SN  - 0027-8424
VL  - 109
IS  - 24
SP  - 9314
EP  - 9319
PB  - National Acad. of Sciences
CY  - Washington
ER  -