VERS 50301 153 2006 MODE SEQ NAME Parabolic mirror, flat M2. Illustrates diffraction effects. NOTE 0 The optical system is similar to Example 11. In this session, we investigate diffraction. First, see the OPD and Ray Fans in Example 11 and in the text/slides for session 2. An unobstructed, unifor NOTE 0 m, circular, aberration-free, system would lead to an Airy disk with about 80% of the energy in the central peak. Bringing in either an obscuration or any aberrations reduces that proportion, rather NOTE 0 than dilating the central peak. Energy goes into outer rings, making them relatively brighter. As regards aberrations, this can be seen in the comatic image at the outer field point. The rings will NOTE 0 become 'speckles' with larger aberrations, as the rings themselves break up. Also, try changing the size of the central obscuration on surface 2. (Rays will appear to pass through the flat mirror.) NOTE 0 There are then two causes of light loss from the central peak: (a) due to the obscuration, (b) due to diffraction. The total loss needs checking in astronomical instruments. RGB2005 UNIT MM X W X CM ENPD 3.000000000000E+002 PUPD 8.000000000000E+002 3.000000000000E+002 GFAC 0.000000000000E+000 0 GCAT SCHOTT RAIM 1.0E-8 0 1 1 0 0 0 PUSH 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0 SDMA 0.000000000000E+000 1 0.000000000000E+000 FTYP 0 0 2 1 ROPD 2 PICB 1 XFLD 0.000000000000E+000 0.000000000000E+000 XFLN 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 YFLD 0.000000000000E+000 1.500000000000E-001 YFLN 0.000000000000E+000 1.500000000000E-001 7.500000000000E-002 -1.500000000000E-001 7.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 0.000000000000E+000 FWGT 1.000000000000E+000 1.000000000000E+000 FWGN 1.000000000000E+000 1.000000000000E+000 1.000000000000E+000 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5.500000000000E-001 1.000000000000E+000 WAVM 19 5.500000000000E-001 1.000000000000E+000 WAVM 20 5.500000000000E-001 1.000000000000E+000 WAVM 21 5.500000000000E-001 1.000000000000E+000 WAVM 22 5.500000000000E-001 1.000000000000E+000 WAVM 23 5.500000000000E-001 1.000000000000E+000 WAVM 24 5.500000000000E-001 1.000000000000E+000 PWAV 1 POLS 1 0.000000000000E+000 1.000000000000E+000 0.000000000000E+000 0.000000000000E+000 1 0 GLRS 3 0 GSTD 0 100.00000 100.00000 100.00000 100.00000 100.00000 100.00000 0 1 1 0 0 NSCD 100 500 0.000000000000E+000 1.000000000000E-006 2 1.000000000000E-006 0 0 0 0 0.000000000000E+000 0 COFN COATING.DAT SCATTER_PROFILE.DAT ABG_DATA.DAT PROFILE.GRD SURF 0 COMM STARS TYPE STANDARD CURV 0.000000000000E+000 0 0.000000000000E+000 0.000000000000E+000 HIDE 0 0 0 0 0 0 0 0 SLAB 7 DISZ INFINITY DIAM 0.000000000000E+000 0 0 POPS 0 0 0 0 0 0 0 0 1 1 1.000000000000E+000 1.000000000000E+000 0 0.000000000000E+000 0.000000000000E+000 SURF 1 COMM START DRAWING TYPE STANDARD CURV 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