Etalon - Photop Technologies - #1

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An etalon is an optical interferometer in which a beam of light undergoes multiple reflections between two reflecting surfaces, and whose resulting optical transmission (or reflection) is periodic in wavelength. Actually it is narrowband wavelength filters. Etalons can be used as precise wavelength references in telecommunication applications where the periodicity of the signal provides an array of reference frequencies for the telecommunication frequency grid. When used with active feedback electronics, etalons form the basis of wavelength locking systems that can be used to stabilize the wavelength of a laser.

The typical Etalon types Photop can offer are Air-space and Solid.

Air-Spaced Etalons are two extremely parallel plates polished to very tight specification with an air gap between them. Using a ULE or fused silica as a space that is optically contacted between the two plates creates the air gap. Designed with special partial reflecting etalon coatings and AR coatings results in improved transmission. The mechanical design is robust and our etalon has great thermal stability. Photop's Air-spaced Etalons are available in a wide range of FSR values from 1500 GHz to 10 GHz.

Partial reflection etalon coating on both sides of very good polished substrate, its high quality cavities result in higher transmission a compact size and lower cost. These etalons have the potential for a high damage threshold and are particularly good for intercavity use. Our Solid Etalons are also available in a wide range of FSR values from 1500 Ghz to 10 Ghz.

O WDM Networks

O Tunable Filter

O Wavelength Locker

O Dispersion Compensation

O Laser Cavity

O Interleavers

O High Precision FSR Tolerance

G Optical Contact Available upon Request

O High Damage Threshold

o Great Thermal Stability

O Telcordia Compliant

O High Transmission

° Easy Tenability

2008 Rev. A