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Thermally induced birefringence and thermal lensing in Nd:YAG rod amplifier was compensated by a 900 rotator with three sets of imaging optics. Experimentally, 2.8% single pass birefringence loss was achieved and a nearly diffraction limited amplified output was observed.

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First year undergraduates find it hard to assign absolute configuration to a chiral center when the lowest priority group is either to the left or right of the horizontal line.