Applications of Volume Holograms
The Bragg selectivity makes volume holograms very important. Prominent examples are:
- Distributed feedback lasers (DFB lasers) as well as distributed Bragg reflector lasers (DBR lasers) where the wavelength selectivity of volume holograms is used to narrow the spectral emission of semiconductor lasers.
- Holographic memory devices for holographic data storage where the Bragg selectivity is used to multiplex several holograms in one piece of holographic recording material using effectively the third dimension of the storage material.
- Fiber Bragg gratings that employ volume holographic gratings encrypted into an optical fiber.
Wavelength filters that are used as an external feedback in particular for semiconductor lasers. Although the idea is similar to that of DBR lasers, these filters are not integrated onto the chip. With the help of such filters also high-power laser diodes become narrow-band and less temperature sensitive. - Imaging spectroscopy by selecting a single wavelength for each pixel in a full camera field. Volume holograms are used as tunable optical filters to produce monochromatic images, also known as hyperspectral imaging.
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