@article{ElsnerUllmannHeueretal.2012,
  author    = {Elsner, Robert and Ullmann, Roland and Heuer, Axel and Menzel, Ralf and Ostermeyer, Martin},
  title     = {Two-dimensional modeling of transient gain gratings in saturable gain media},
  series = {OPTICS EXPRESS},
  volume    = {20},
  journal   = {OPTICS EXPRESS},
  number    = {7},
  publisher = {OPTICAL SOC AMER},
  address   = {WASHINGTON},
  issn      = {1094-4087},
  doi       = {10.1364/OE.20.006887},
  pages     = {6887 -- 6896},
  year      = {2012},
  abstract  = {A transient two-dimensional model describing degenerate four-wave mixing inside saturable gain media is presented. The new model is compared to existing one-dimensional models with their qualitative results confirmed. Large quantitative differences with respect to peak reflectivity and optimum pump fluence are observed. Furthermore, the influence of the beam focus size, the transverse position and the crossing angle on the reflectivity of the grating is investigated using the improved model. It is demonstrated that the phase conjugate reflectivity depends sensitively on the transverse features of the interacting beams with a transverse shift in the position of the pump beams yielding a threefold improvement in reflectivity. (C) 2012 Optical Society of America},
  language  = {en}
}
@article{ElsnerPuhlmannPieplowetal.2015,
  author    = {Elsner, Robert and Puhlmann, Dirk and Pieplow, Gregor and Heuer, Axel and Menzel, Ralf},
  title     = {Transverse distinguishability of entangled photons with arbitrarily shaped spatial near- and far-field distributions},
  series = {Journal of the Optical Society of America : B, Optical physics},
  volume    = {32},
  journal   = {Journal of the Optical Society of America : B, Optical physics},
  number    = {9},
  publisher = {Optical Society of America},
  address   = {Washington},
  issn      = {0740-3224},
  doi       = {10.1364/JOSAB.32.001910},
  pages     = {1910 -- 1919},
  year      = {2015},
  abstract  = {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},
  language  = {en}
}
@article{WarschburgerGmeinerBondueetal.2023,
  author    = {Warschburger, Petra and Gmeiner, Michaela Silvia and Bond{\"u}, Rebecca and Klein, Alexandra-Maria and Busching, Robert and Elsner, Birgit},
  title     = {Self-regulation as a resource for coping with developmental challenges during middle childhood and adolescence},
  series = {BMC Psychology},
  volume    = {11},
  journal   = {BMC Psychology},
  number    = {1},
  publisher = {Springer Nature},
  address   = {London},
  issn      = {2050-7283},
  doi       = {10.1186/s40359-023-01140-3},
  pages     = {21},
  year      = {2023},
  abstract  = {Background Self-regulation (SR) as the ability to regulate one's own physical state, emotions, cognitions, and behavior, is considered to play a pivotal role in the concurrent and subsequent mental and physical health of an individual. Although SR skills encompass numerous sub-facets, previous research has often focused on only one or a few of these sub-facets, and only rarely on adolescence. Therefore, little is known about the development of the sub-facets, their interplay, and their specific contributions to future developmental outcomes, particularly in adolescence. To fill these research gaps, this study aims to prospectively examine (1) the development of SR and (2) their influence on adolescent-specific developmental outcomes in a large community sample. Methods/design Based on previously collected data from the Potsdam Intrapersonal Developmental Risk (PIER) study with three measurement points, the present prospective, longitudinal study aims to add a fourth measurement point (PIERYOUTH). We aim to retain at least 1074 participants now between 16 and 23 years of the initially 1657 participants (6-11 years of age at the first measurement point in 2012/2013; 52.2\% female). The study will continue to follow a multi-method (questionnaires, physiological assessments, performance-based computer tasks), multi-facet (assessing various domains of SR), and multi-rater (self-, parent-, and teacher-report) approach. In addition, a broad range of adolescent-specific developmental outcomes is considered. In doing so, we will cover the development of SR and relevant outcomes over the period of 10 years. In addition, we intend to conduct a fifth measurement point (given prolonged funding) to investigate development up to young adulthood. Discussion With its broad and multimethodological approach, PIERYOUTH aims to contribute to a deeper understanding of the development and role of various SR sub-facets from middle childhood to adolescence. The large sample size and low drop-out rates in the first three measurements points form a sound database for our present prospective research.Trial registration German Clinical Trials Register, registration number DRKS00030847.},
  language  = {en}
}