Semiconductor laser optical system


PURPOSE:To compensate the astigmatic difference of a semiconductor laser without increasing the number of parts by arranging the semiconductor laser and a collimator lens so that the astigmatic difference is canceled by the astigmatism of the collimator lens. CONSTITUTION:An example of a semiconductor laser optical system is shown in figure, where DELTAM and DELTAS are astigmatisms viewed from the right side of the collimator lens 2 and meridional image surface curvature and sagittal image surface curvature, respectively. Namely, the semiconductor laser 1 is provided so that the distance between DELTAM and DELTAS is equal to the length from M to S.




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