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18 December 2014 The design and fabricate of wide angle 905nm narrow band filter
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All-dielectric film narrow band filter is widely used in laser system owing to its excellent optical capability, manufacturability and environmental adaptability. But 905nm infrared semiconductor laser system have large divergence angel so we designed entrance light cone angle 905nm narrow band filter. And center wavelength shift, due to entrance light cone angle, affects its spectral selective power seriously. In order to reduce these impacts, an informal dielectric film narrowband filter is designed. Changes of transmission characteristics with oblique incidence of Gaussian beam of uneven illumination are analyzed. The relationship between the angle of incidence and the central wavelength shift quantificational are Solved. A ± 30 ° incident 905nm narrowband filter was fabricated. Between 880nm and 950nm, the average transmittance is above 90%, and at the cut-off band the average transmittance is below 1%.
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Baohua Shi, Zaijin Li, Hongyu Li, and Yi Qu "The design and fabricate of wide angle 905nm narrow band filter", Proc. SPIE 9295, International Symposium on Optoelectronic Technology and Application 2014: Laser Materials Processing; and Micro/Nano Technologies, 929507 (18 December 2014);

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