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Report Reveals Pitfalls of Laser Astigmatism Measurement

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Kathleen G. Tatterson

AUBURN, Calif. -- Scientists using a common method of measuring the astigmatism, or optimum focal length, of laser diodes have been led astray, according to a report released by researchers at Coherent Inc. Measuring astigmatism is vital to the applications of laser diodes in fields such as optical disc data reading and high-resolution bar-code reading. However, in a paper published in Optical Engineering, Coherent optical engineer Haiyin Sun said, "Previous measurement with the measured data being processed by geometric optics was wrong." The geometric optics method is traditionally used to...Read full article

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    Published: September 1997
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