Abstract We discuss the concept of characteristic squeezing modes applied to a travelling-wave optical parametric amplifier pumped by an ultrashort pulse. The characteristic modes undergo decoupled single-mode squeezing transformations, and therefore they form a useful basis to describe the evolution of the entire multimode system. This provides an elegant and intuitive picture of quantum stati...

(Received 00 Month 200x; In final form 00 Month 200x) We study experimentally parametric amplification in the continuous regime using a transverse-degenerate type-II Optical Parametric Oscillator operated below threshold. We demonstrate that this device is able to amplify either in the phase insensitive or phase sensitive way first a single mode beam, then a multimode image. Furthermore the tot...

As collaborative design and configuration design gain increasing importance in product development, it becomes essential to exchange parametric CAD models among participants. Parametric CAD models can be represented and exchanged in the form of a macro file or a part file that contains the modeling history of a product. The modeling history of a parametric CAD model contains feature specificati...

Parametric-surface tessellation is one of the most important algorithms for CAGD applications. This paper presents a new parametric-surface tessellation method based on degree reduction: (1) a given parametric surface (or NURBS surface) of degrees (p; q) is decomposed into a set of Bezier surfaces, (2) the Bezier surfaces are converted into a set of bilinear surfaces by applying consecutive ste...

This article proposes the investigation of two case studies 20th century residential architecture that can be considered paradigmatic due to pioneering use parametric thinking in architecture. It deals with Alexander Klein’s plan analysis model and Cedric Price’s research on housing through his concept 24-hour economic living toy. Both cases are analyzed using contemporary tools digitally repro...

A method for shape design of free-form shells under self-weight is presented, without resorting to any parametric representations. The graph surface discretized into a polyhedral with quadrilateral mesh. Membrane stresses which satisfy the equilibrium in horizontal plane are given based on Pucher’s formulation, and equation vertical direction solved. Desirable distributions thrusts boundaries c...