title: Spatial modes of phase-sensitive parametric image amplifiers with circular and elliptical Gaussian pumps.
abstract: We develop a method for finding the number and shapes of the independently squeezed or amplified modes of a spatially-broadband, travelling-wave, frequency- and polarization-degenerate optical parametric amplifier in the general case of an elliptical Gaussian pump. The obtained results show that for tightly focused pump only one mode is squeezed, and this mode has a Gaussian TEM(00) shape. For larger pump spot sizes that support multiple modes, the shapes of the most-amplified modes are close to Hermite- or Laguerre-Gaussian profiles. These results can be used to generate matched local oscillators for detecting high amounts of squeezing and to design parametric image amplifiers that introduce minimal distortion.
authors.affiliation: Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019, USA.
authors.forename: Muthiah
authors.initials: M
authors.lastname: Annamalai
authors.forename: Nikolai
authors.initials: N
authors.lastname: Stelmakh
authors.forename: Michael
authors.initials: M
authors.lastname: Vasilyev
authors.forename: Prem
authors.initials: P
authors.lastname: Kumar
mesh_terms: D000669:Amplifiers, Electronic; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation*; D008027:Light; D015233:Models, Statistical; D016011:Normal Distribution; D055096:Optical Devices; D012542:Scattering, Radiation