Performance Predictions for Bulk Chalcogenide Gratings Produced by the Photodissolution Effect
ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (UNITED KINGDOM)
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Gratings produced by the photodoping of chalcogenide glasses are shown to have great promise for use as diffracting elements in the red to far infrared up to 15 micron. In principle, they are simple to fabricate - phase gratings being produced by mask exposure or holographic techniques. The performance of bulk, rectangular phase gratings is investigated using a coupled wave model and a detailed analysis performed in the thin, multiwave and volume diffraction regimes. High efficiencies 97 are found to be achievable in the multiwave regime. Based on available material data for silver doped arsenic sulphide glasses, the optimum parameters for operation at 632.8 nm, 4 micron and 10.6 micron are calculated. The maximum efficiencies likely to be achieved and angular responses are evaluated. Great Britain.
- Ceramics, Refractories and Glass