Abstract
We demonstrate a concept for visible laser sources based on sum-frequency generation of beam combined tapered diode lasers. In this specific case, a 1.7W sum-frequency generated green laser at 509nm is obtained, by frequency adding of 6.17W from a 978nm tapered diode laser with 8.06W from a 1063nm tapered diode laser, inside a periodically poled MgO doped lithium niobate crystal. This corresponds to an optical to optical conversion efficiency of 12.1%. As an example of potential applications, the generated nearly diffraction-limited green light is used for pumping a Ti:sapphire laser, thus demonstrating good beam quality and power stability. The maximum output powers achieved when pumping the Ti:sapphire laser are 226mW (CW) and 185mW (mode-locked) at 1.7W green pump power. The optical spectrum emitted by the mode-locked Ti:sapphire laser shows a spectral width of about 54nm (FWHM), indicating less than 20fs pulse width.
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