Abstract
Potassium Lithium Niobate (KLN) has excellent potential as a non-linear medium for direct second harmonic generation (SHG) of semiconductor diode lasers. KLN crystallises in a tungsten bronze structure and space group P4bm within the compositional range K3−yLi2−x+yNb5+xO15+2x, 0.15 <X <2, -0.5 <Y <0.6. It exhibits only one ferroelectric transition from a paraelectric to ferroelectric phase well above room temperature at a Curie point of around 420 °C. Previous results indicate that KLN possesses appropriate birefringence for non-critical phase matching (NCPM) in the wavelength range of interest and large non-linear optical coefficients for efficient SHG output at sub-milliwatt pump power levels [1].
© 1998 IEEE
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