Abstract
In this paper, we describe a second-harmonic generation scheme with a blue laser diode (LD) that generates tunable coherent deep ultra violet at approximately 219 nm. Using a short fundamental wavelength with this technique, a high second-harmonic (SH) power is hardly observed. At an approximately 8 µW SH power at 219 nm and an approximately 1 nm fundamental wavelength tunability can be obtained using a single-mode blue LD chip, a nonlinear optic crystal, and an external cavity.
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