Sl. Wu et al., WET CHEMICAL PATTERNING OF KTP THIN-FILMS FOR NONLINEAR-OPTICAL WAVE-GUIDE APPLICATIONS, Journal of the Electrochemical Society, 142(10), 1995, pp. 3556-3557
A new and simple method to etch and pattern potassium titanyl phosphat
e (KTP) thin films has been developed. We found that KTP films on fuse
d quartz subtrates can be etched down using a wet chemical mixture of
HCl:2H(2)O at 75 degrees C. Using the etchant, rib waveguide structure
s have been fabricated with photolithography.