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Coherent announces UV laser for sapphire scribing in GaN LEDs

Coherent has announced a UV laser that could reduce the cost of micromachining tasks in areas like scribing sapphire substrates used in the fabrication of GaN LEDs.


The AVIA 355-5 is a Q-switched Nd:YVO4 laser that delivers 5W of 355 nm output at 50 kHz, and is suitable for operation at repetition rates of up to 150 kHz.  Its combination of high repetition rate and short pulse length (less than 20 nsec at 5W) enables a high throughput processing with minimal heat affected zone (HAZ).


The new UV laser is targeted as a cost effective, compact, OEM product that offers many of the features found on more powerful AVIA models.  The laser also has an automated harmonic crystal shifter to maintain constant output power for greater than 20,000 hours and help reduce the cost of ownership. In addition, the laser’s beam position sensor and feedback loop results in very high beam position stability over the life of the laser.


The AVIA 355-5 has been designed for easy integration with a laser head measuring only 491 mm x 216 mm x 141 mm.  The laser also delivers enhanced reliability and ease of maintenance through the use of a highly efficient single pump diode module that is field replaceable. 

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