FAILURE DETECTION OF LASER DIODES
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United States of America Patent
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Mar 17, 2016
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Mar 20, 2015
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Embodiments described herein generally relate to an apparatus and method for performing photolithography processes. More particularly, embodiments described herein generally relate to an apparatus and method for the digital control of optical-coupled solid state relays employed on a laser diode. Digital control of the optical-coupled solid state relays may allow for the turning on and/or turning off of the optical-coupled solid state relays and allow for the failure detection of each laser diode. Furthermore, the embodiments described herein allow for an increase in current provided to the laser diodes such that overall laser diode output for optimized illumination may be maintained while life time and tool reliability are also increased.
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