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Proceedings Paper

Matching of Bragg condition of holographic phase gratings in 1.3-1.5um region
Author(s): Raimo Veil Johannes Silvennoinen; Rauno M. Hamalainen
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Paper Abstract

The spectral diffraction efficiency of phase holograms depends on refractive index modulation, grating spacing, and the thickness of a holographic grating, e.g., the refractive index modulation of the dichromatic gelatin grating (DCG) can be increased so that the diffraction efficiency of 90% measured in Bragg angle without refractive index matching can be achieved in the recording wavelength. The use of the same holographic grating in longer wavelength regions in accordance with the Bragg condition demands the refractive index matching. In our applications, holographic phase gratings in hololens form (HOL) are used as a wavelength selective elements in conventional optical multi-/demultiplexing (mux/demux) applications, where various wavelengths are multiplexed to the detectors needed. On the other hand, the novel applications of the HOL element used as a monochromator in the external cavity construction of a semiconductor laser according to the refractive index matching the Bragg condition are theoretically investigated in the wavelength region from 1.3 micrometers to 1.5 micrometers .

Paper Details

Date Published: 1 October 1991
PDF: 5 pages
Proc. SPIE 1574, Intl Colloquium on Diffractive Optical Elements, (1 October 1991); doi: 10.1117/12.50106
Show Author Affiliations
Raimo Veil Johannes Silvennoinen, Univ. of Joensuu (Finland)
Rauno M. Hamalainen, Univ. of Joensuu (Finland)


Published in SPIE Proceedings Vol. 1574:
Intl Colloquium on Diffractive Optical Elements

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