Surface light-induced changes in thin polymer films
Andrew Skumanich
SPIE Optics Quebec 1993
A novel fibre-optic Fourier transform spectrometer was constructed. The optical retardation between the arms of a Mach-Zehnder-type interferometer made of single-mode optical fibre is modulated by variation of the fibre temperature. Spectra of a multimode laser diode and a broad-band light source were recorded. Frequency shifts within the observed spectra can be explained with the frequency dispersion of the coefficient of the dependence of the refractive index on temperature, dn/dT. An oversampling scheme utilizing a phase-locked loop circuit was successfully tested. This allows for the acquisition of spectra with shorter wavelength components than the wavelength of the reference laser if a fibre with sufficiently low cut-off wavelength is employed. Thus, the accessible wavelength region may be extended to the near UV using a conventional silica fibre. Coherent averaging of multiple interferograms was successfully applied to enhance the signal-to-noise ratio of interferograms.
Andrew Skumanich
SPIE Optics Quebec 1993
Alfred K. Wong, Antoinette F. Molless, et al.
SPIE Advanced Lithography 2000
Heinz Koeppl, Marc Hafner, et al.
BMC Bioinformatics
Nimrod Megiddo
Journal of Symbolic Computation