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Efficient generation of coherent blue light at 440 nm by intracavity-frequency-tripling 1319 - nm emission from a Nd:YAG laser

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Abstract

A new route for efficiently generating coherent blue light has been explored based on intracavity effective third-harmonic generation in one partly periodically poled KTiOPO4 crystal placed inside the cavity of a diode-pumped Nd:YAG laser. To achieve efficient conversion, we use a dual-temperature oven to separately control the phase-matching conditions for the two second-order nonlinear processes. In addition, a Fabry–Perot cavity at 660nm is incorporated into the crystal to increase the blue power significantly. When the laser is Q switched to produce long pulses, an average power of 118mW is generated at 440nm at a pump power of 10W.

© 2005 Optical Society of America

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