Abstract
We report a design for upconversion blue lasers based on simultaneously fulfilling the nonlinear processes of optical parametric oscillation (OPO) and second-harmonic generation (SHG) in a periodically poled lithium tantalate (PPLT). The uncoated -long PPLT device exhibits a low threshold of and a differential slope efficiency of 22.6%, rendering blue generation when pumped by a pulsed green laser with an average power rating of . These observations were attributed to a quasi-phase-matching (QPM) structural design with a 75% domain duty cycle to ensure the concurrence of frequency doubling with the first-order QPM-OPO PPLT device via the second-order QPM-SHG process.
© 2010 Optical Society of America
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