title: Reflection of light by composite volume holograms: Fresnel corrections and Fabry-Perot spectral filtering.
abstract: Effects in composite volume Bragg gratings (VBGs) are studied theoretically and experimentally. The mathematics of reflection is formulated with a unified account of Fresnel reflections by the boundaries and of VBG reflection. We introduce the strength S of reflection by an arbitrary lossless element such that the intensity of reflection is R=tanh(2) S. We show that the ultimate maximum/minimum of reflection by a composite lossless system corresponds to addition/subtraction of relevant strengths of the sequential elements. We present a new physical interpretation of standard Fresnel reflection: strength for TE or for TM reflection is given by addition or by subtraction of two contributions. One of them is an angle-independent contribution of the impedance step, while the other is an angle-dependent contribution of the step of propagation speed. We study an assembly of two VBG mirrors with a thin immersion layer between them that constitutes a Fabry-Perot spectral filter. The transmission wavelength of the assembly depends on the phase shift between the two VBGs. Spectral resolution Deltalambda(FWHM)=25 pm at lambda=1063.4 nm is achieved with the device of small total physical thickness 2L=5.52 mm.
authors.affiliation: CREOL, The College of Optics and Photonics, University of Central Florida, P.O. Box 162700, Orlando, Florida 32816-2700, USA.
authors.forename: Leonid B
authors.initials: LB
authors.lastname: Glebov
authors.forename: Julien
authors.initials: J
authors.lastname: Lumeau
authors.forename: Sergiy
authors.initials: S
authors.lastname: Mokhov
authors.forename: Vadim
authors.initials: V
authors.lastname: Smirnov
authors.forename: Boris Ya
authors.initials: BY
authors.lastname: Zeldovich