Holographic elements embedded in a photo-thermo-refractive (PTR) glass were recently deployed in a wide variety of applications. This material allowed recording of phase Bragg gratings with high efficiency for visible and near IR spectral regions. Recent advances in technology enabled fabrication of a large variety of elements ideally suitable for quantum optics applications such as single photon detection, atomic clocks, quantum computing and network. PTR glass based diffractive elements are used as combiners, signal separation, pump suppression and as dispersive elements. High efficiency, narrow bandwidth, high suppression, and large dispersion are key parameters that made those elements irreplaceable.
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