Characterization of symmetric [3 x 3] directional couplers fabricated by direct writing with a femtosecond laser oscillator

Kenya, Suzuki; Sharma, Vikas; Fujimoto, James G.; Ippen, Erich P.; Nasu, Yusuke

doi:10.1364/oe.14.002335

Cited by 59 publications

(25 citation statements)

References 7 publications

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“…Ref. [20]) which may bring about further asymmetries in the coupling. One can infer that in this case a symmetric equilateral-triangle geometry would not provide symmetric coupling; indeed, in order to realize an accurately balanced tritter, it is crucial to develop a robust experimental procedure for optimizing the fabrication geometric parameters, which can compensate all the non-idealities.…”

Section: Supplementary Note 2: Geometry Optimization Of the Femtosecomentioning

confidence: 99%

Three-photon bosonic coalescence in an integrated tritter

et al. 2013

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The main features of quantum mechanics reside in interference deriving from the superposition of different quantum states. While current quantum optical technology enables two-photon interference both in bulk and integrated systems, simultaneous interference of more than two particles, leading to richer quantum phenomena, is still a challenging task. Here we report the experimental observation of three-photon interference in an integrated three-port directional coupler realized by ultrafast laser writing. By exploiting the capability of this technique to produce three-dimensional structures, we realized and tested in the quantum regime a three-port beam splitter, namely a tritter, which allowed us to observe bosonic coalescence of three photons. These results open new important perspectives in many areas of quantum information, such as fundamental tests of quantum mechanics with increasing number of photons, quantum state engineering, quantum sensing and quantum simulation.

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Section: Supplementary Note 2: Geometry Optimization Of the Femtosecomentioning

confidence: 99%

Three-photon bosonic coalescence in an integrated tritter

et al. 2013

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“…With this fs-laser writing technique different components for integrated optics like waveguides [10], directional couplers [11], beam splitters [12], amplifiers [13], and waveguide lasers [14] could be fabricated in various glasses. Furthermore, the integration of several optical elements on a single chip was demonstrated by the fabrication of monolithic distributed feedback lasers [15] and passive ring resonators [16].…”

Section: Introductionmentioning

confidence: 99%

Crystalline Waveguide Lasers in the Visible and Near-Infrared Spectral Range

Calmano

Müller

2015

IEEE J. Select. Topics Quantum Electron.

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This paper summarizes our recent results on crystalline waveguides and waveguide lasers fabricated by the femtosecond-laser writing technique. Highly efficient waveguide lasers emitting in the near infrared spectral range based on ytterbium and neodymium doped Y 3 Al 5 O 12 with slope efficiencies above 70% and continuous wave output powers of more than 5 W were demonstrated. Furthermore, pulsed laser operation of passively Q-switched Yb:YAG and Nd:YAG wavequide lasers was achieved by incorporating the saturable absorber Cr 4+ :YAG in a monolithic setup. Based on fs-laser written curved structures in Yb:YAG, efficient curved waveguide lasers could be demonstrated. Also, waveguide lasers in the visible spectral range were investigated. We achieved laser emission in the green, orange, red and deep-red spectral region and could demonstrate output powers of more than 1 W with waveguides based on praseodymium doped materials. Additionally, switchable and dual wavelength operation between the orange and red laser emission was achieved. By utilizing the nonlinear crystal KTiOPO 4 as substrate material for fs-laser inscription, nonlinear waveguides were realized. With these devices, efficient second harmonic generation into the blue and green spectral range was achieved.

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“…This brings a key change to the underlying mathematical framework as we work with SU(3) transformations rather than SU(2) transformations. We specifically examine a three port integrated device consisting of a small array of three single mode evanescently coupled waveguides as these are relatively easy to fabricate [23,24]. Although we tailor our discussion to coupled waveguide systems the results will be applicable to a wide class of bosonic systems described by the Hamiltonian (1).…”

Section: Introductionmentioning

confidence: 99%

Complete three photon Hong-Ou-Mandel interference at a three port device

Mährlein¹,

Zanthier²,

Agarwal³

2015

Opt. Express

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Abstract:We report the possibility of completely destructive interference of three indistinguishable photons on a three port device providing a generalisation of the well known Hong-Ou-Mandel interference of two indistinguishable photons on a two port device. Our analysis is based on the underlying mathematical framework of SU(3) transformations rather than SU(2) transformations. We show the completely destructive three photon interference for a large range of parameters of the three port device and point out the physical origin of such interference in terms of the contributions from different quantum paths. As each output port can deliver zero to three photons the device generates higher dimensional entanglement. In particular, different forms of entangled states of qudits can be generated depending on the device parameters. Our system is different from a symmetric three port beam splitter which does not exhibit a three photon Hong-Ou-Mandel interference.

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Characterization of symmetric [3 x 3] directional couplers fabricated by direct writing with a femtosecond laser oscillator

Cited by 59 publications

References 7 publications

Three-photon bosonic coalescence in an integrated tritter

Three-photon bosonic coalescence in an integrated tritter

Crystalline Waveguide Lasers in the Visible and Near-Infrared Spectral Range

Complete three photon Hong-Ou-Mandel interference at a three port device

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