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Synthesized Narrowband Angle Filter for Optical Interference Coatings

Explore the concept of Angle Filters in optical interference coatings, their applications, and the theory behind them. Learn about how these filters discriminate light based on the angle of arrival, reject stray light, and provide narrowband filtering capabilities. Discover the potential in reducing bandwidth, achieving omnidirectional rejection, and identifying planetary atmospheric molecules.

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Synthesized Narrowband Angle Filter for Optical Interference Coatings

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  1. TC.3 OIC 2019 Design I Narrowband Angle Filter Bill Southwell 4-June-2019 OSA Optical Interference Coatings Conference Santa Ana Pueblo, New Mexico, USA

  2. What is an Angle Filter? • A new Interference Coating that discriminates light on the basis of its angle of arrival • Potential Applications • Optical communications • Block bright light from near-by sun, moon, or star • Stray light rejection on detector planes

  3. Normal Incidence Cavity FilterNot a good Angle Discriminator

  4. 30˚ Cavity FilterΔλ = 1 nm : Δθ = 1˚

  5. Angle of Incidence (AOI) • Ray = sinθ cosφ+ sinθ sinφ+ cosθ • Filter normal (Normal Incidence Filter) • Cos(AOI) = ● = cosθ (Independent of φ) • Filter tilted (tilted ˚) • Cos(AOI) = ● = sinθ cosφsinβ+ cosθ cosβ • x,z plane: φ =0: AOI = θ - β • y,z plane: φ = 90˚: Cos(AOI) = cosθ cosβ

  6. Angle of Incidence for a 30˚ Tilted Filter

  7. Tilted Filter only Discriminates in Angle in one Plane Tilted filter transmission in a 10˚ by 10˚ angle patch around 30˚

  8. Optical Axis Filter a Filter b 90 degrees Consider Two Tilted Filters Projection of the filter normal vectors are separated by 90˚

  9. Optical Axis Filter a Filter b 90 degrees Two Tilted 30˚ Cavity Filter Configuration Ta Tb Ta*Tb

  10. Synthesized Narrowband Angle Filter 1 degree FWHM

  11. Optical Axis Filter a Filter b 90 degrees Synthesized Narrowband Angle Filter 1 degree FWHM Ta Tb Ta*Tb

  12. Off-Axis Rejection of Angle Filter

  13. Tristimulus Filter Color Gamut450 nm, 530 nm, and 650 nm

  14. 3 Color Angle Filter

  15. 2 Tilted Tristim Angle Filters

  16. Summary-Narrowband Angle Filter • An optical interference coating • Operates at a tilted angle to incoming light • Passes light only from a narrow angle band width (designable) • Rejects light from other angles in the plane of the tilt • A two tilted filter configuration • Reduces bandwidth • Provides omnidirectional angular rejection • May be cascaded to produce extremely high rejection • May be designed to pass multiple wavelengths • Identify planetary atmospheric molecules • Tristimulus color transmission

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