S.G. Grubb, K.W.Bennett, R.S. Cannon, and W.F.Humer,
There has recently been tremendous interest in the development of efficient, compact, longlived, solid state blue laser sources. Whereas most diode-based blue sources use frequency doubling or mixing techniques, the process of upconversion has attracted a great deal of interest due to the simplicity of this approach used to convert infrared laser diodes to visible light. Recently, the advantages of the fiber laser geometry for upconversion lasers have become apparent and have led to the demonstration of 11 different cw, room temperature visible upconversion laser/pumping combinations.
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