Matching of Bragg condition of holographic phase gratings in 1.3-1.5um region

Raimo Veil Johannes Silvennoinen; Rauno M. Hamalainen

doi:10.1117/12.50106

1 October 1991 Matching of Bragg condition of holographic phase gratings in 1.3-1.5um region

Raimo Veil Johannes Silvennoinen, Rauno M. Hamalainen

Proceedings Volume 1574, Intl Colloquium on Diffractive Optical Elements; (1991) https://doi.org/10.1117/12.50106
Event: International Colloquium on Diffractive Optical Elements, 1991, Szklarska Poreba, Poland

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 .

Citation Download Citation

Raimo Veil Johannes Silvennoinen and Rauno M. Hamalainen "Matching of Bragg condition of holographic phase gratings in 1.3-1.5um region", Proc. SPIE 1574, Intl Colloquium on Diffractive Optical Elements, (1 October 1991); https://doi.org/10.1117/12.50106

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