Technical Note:
Diode-Pumped Solid-State UV Lasers Improve LED Sapphire Wafer Scribing

Photonics Spectra, October 2010

Rajesh S. Patel, Ashwini Tamhankar, Tim Edwards

High brightness LEDs enable low power illumination of cell phones, televisions and touch-screen displays. There is also a huge potential market for high brightness LED as a replacement for incandescent light bulbs. Scribing LED wafers with lasers can improve yields and reduce costs by creating narrower scribe lines than mechanical scribing. UV Q-switched DPSS lasers using short pulses and high repetition rates can be optimized at fluences to reduce microcracking and damage to the LED wafer substrate. This makes UV Q-switched DPSS lasers the choice for advanced LED wafer scribing.

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