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Blue light emission from a laser diode pumped ring resonator with an organic second‐harmonic generation crystal of 8‐(4’‐acetylphenyl)‐1,4‐dioxa‐8‐azaspirol[4.5]decane

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6 Author(s)
Sagawa, M. ; Hitachi Research Laboratory, Hitachi Ltd., 7‐1‐1, Omika‐cho, Hitachi, Ibaraki 319‐12, Japan ; Kagawa, H. ; Kakuta, A. ; Kaji, M.
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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. © 1995 American Institute of Physics.

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Applied Physics Letters  (Volume:66 ,  Issue: 5 )