Etalon
A Fabry-Pérot etalon is a high-resolution optical device invented by French physicists Fabry and Pérot in 1897, based on multiple-beam interference. It typically uses two parallel, high-reflection-coated plates, or a single parallel plate coated on both sides, forming a fixed-spacing interference cavity. Coating-surface flatness must be controlled within 1/20 to 1/100 wavelength for precise interference. Sharp, fine fringes and strong wavelength selectivity make it effectively a precision narrowband filter, transmitting resonant wavelengths and reflecting or filtering others. Higher reflectivity narrows bright fringes and improves wavelength discrimination, making etalons important in precision optical measurement.
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Etalon
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Dowell-optics
Etalon products with various customized FSRs can be provided.
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Sealed Laser Frequency-Stabilization Cavity ATSC Series(DP)
Etalons
Dospectrum
Wavelength Range: 400~2000nm Free Spectral Range: 3GHz Cavity Finesse: >100
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Etalon Etalons
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Eternopto
Free Spectral Range: 10~2000 GHz Material: Fused Silica Parallelism [@633nm]: λ/100 @633nm
In transmission mode, etalons exhibit a series of transmission peaks with periodic frequency spacing and are commonly used for wavelength locking in telecommunications. Key characteristics are free spectral range (FSR), the frequency interval between peaks, and finesse, which largely determines peak shape. An etalon filter generally comprises a spacer between two reflective stacks.
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Etalon -100G Etalons Hhguanglian
Optical Specifications -Free Spectral Range: 100 +/- 0.05 Temperature 20℃±1℃ Optical Specifications - Operating Wavelength: 1520 ~ 1570 nm Optical Specifications - Effective Aperture: ＞ central 80%
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