Table I
Determination of the Groove Spacing
m1 | m2 | x/2 (deg) | d (μm) |
---|
91 | −44 | 45.8040 | 31.6410 |
91 | −42 | 45.1696 | 31.6409 |
90 | −44 | 45.1285 | 31.6418 |
90 | −42 | 44.4940 | 31.6418 |
Average of measured spacing
= 31.6414 ± 0.0005
μm.
Correct value: 50 × λ (He–Ne) = 31.6408
μm.
Table II
Determination of Blaze Angle and Groove Edge Defect Parameter from Recordings of Intensity Minima of Off-blaze Orders at Incidence Angles Smaller than the Blaze Angle
Order in blaze | Order recorded minima | Incidence angle measured (deg.) | Diffraction angle calculated (deg.) |
---|
89 | 88 | 55.75 | 68.97 |
89 | 90 | 55.80 | 76.63 |
88 | 87 | 52.12 | 71.93 |
88 | 89 | 52.02 | 82.64 |
Fitted blaze angle: 64.11°.
Fitted groove edge defect parameter: 0.08
μm.
Note that for a perfect grating the minima should have exactly the same incidence angles.
Table III
Determination of Blaze Angle and Groove Edge Defect Parameter from Measured Intensities of Central Blaze Orders at Incidence Angles Larger than the Blaze Angle
Order | Diffraction angle angle (deg) | Measured intensities | Calculated intensities (best fit) |
---|
Incidence angle: 72.10° |
88 | 53.94 | 0.282 | 0.331 |
89 | 55.93 | 1.019 | 0.996 |
90 | 58.03 | 0.282 | 0.319 |
Incidence angle: 76.43° |
86 | 48.41 | 0.149 | 0.165 |
87 | 50.17 | 0.590 | 0.593 |
88 | 51.99 | 1.008 | 1.004 |
89 | 53.89 | 0.597 | 0.598 |
Average of fitted blaze angles: 64.12.
Average of fitted groove edge defect parameter: 0.0
μm.