Abstract
Changes in both surface morphology and transient reflectance on the front facet of a diode laser are monitored during a catastrophic optical damage (COD) process in a single pulse operation. Use of a 1550 nm time-resolved micro-reflectance optical system (with time resolution of ~4 ns) allows us to monitor the creation sequences of up to four distinct COD seed points on an 808 nm laser facet within a period of <4 μs. Further, this system can even reveal the formation process of the first degradation point, which was created within 20 ns. Creation of nonplanar facet areas by local melting represents the main mechanism behind the observed changes in reflectivity.
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