Abstract
We realize a femtosecond high-power spontaneous mode-locked operation with gigahertz oscillation in a vertical-external cavity surface-emitting laser under the condition of eliminating the internal and external unwanted reflection. We find that the reflectivity of the output coupler has a significant influence not only on the output power but also on the output pulse duration. With an incident pump power of , we have achieved of average output power with pulse duration at a repetition rate of . The shortest pulse duration was at an average output power of .
© 2011 Optical Society of America
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