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Concave Holographic Gratings 　 a incidence angle r distance from entrance slit to grating center b diffraction angle r' distance from grating center to image List of Product Tables Part No. Engrave the density(line/ mm) The focal length input output  Dispersiveness nm/mm resolving powernm angle(degree) dimension mm Wave- lengthnm XGP-016 1200 200 195 4 0.2 61.6 40*45*10 200-800 XGP-017 1200 100 94 8 0.4 61.6 Φ32*9.5 200-800 XGP-018 1000 200 182 5 0.2 41.5 47.5*47.5*12 200-900 XGP-019 600 100 94 16 0.8 61.6 Φ32*9.5 400-1600 XGP-020 300 100 199 16 0.8 61.6 40*45*10 800-3500 XGP-021 180       　   Φ35*9.5 360-900

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