For the afocal, 2-mirror beam compressor
yi ri and
The condition for Pc = 0 in the Paul-Baker system is therefore ^ = 1 — Ra r3
Since |r3| > |r2|, the spherical aberration introduced by the tertiary is reduced compared with the Paul system. Baker compensates this by modifying the aspheric on the secondary. Since it receives an afocal beam, (Sj)3 can be calculated from Eqs. (3.25) for the simple case of a primary with paraxial ray height y3 = y2. Then, in the first equation of (3.20) we have ya
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