A laser diode pumped ring resonator was built with a new organic second-order nonlinear optical crystal, 8-(4′-acetylphenyl)-1,4-dioxa-8-azaspiro[4.5] decane. Ultraprecision diamond polishing was used for the crystal and optically flat surfaces and roughnesses of less than λ/10 were achieved. The surfaces were dip coated with a perfluorinated polymer thin film to suppress surface reflection loss. Under resonant conditions, fundamental power was enhanced and a blue second-harmonic emission with wavelength of 405.5 nm was observed.
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Sagawa et al. (1995) studied this question.