Optical Isolator AF3-4C
Description
A Faraday isolator or optical isolator is an optical component which allows the transmission of polarised light in only one direction. They are typically used to prevent unwanted feedback into an optical oscillator (A laser cavity is a good example.) The operation of the device depends on the Faraday effect which is used in the main component, the Faraday rotator. An isolator is made of three parts, an input polarizer (for this discussion we will assume it's polarized up and down), a Faraday rotator, and an output polarizer (we will assume this one is 45° to the right.) Light traveling in the forward direction becomes polarized (vertically in our case) by the input polarizer. The Faraday rotator will rotate the polarization 45° to the right. The output polarizer will allow all the light to escape and continue. Light traveling in the backward direction becomes polarized (45°; to the right in this case) by the output polarizer. The Faraday Rotator will rotate the polarization 45° more to the right so that it is horizontally polarized (the rotation is insensitive to direction of propagation) and the input polarizer, which is vertically aligned, will block this light. Faraday isolators are different from 1/4 wave plate based isolators because it can provide non-reciprocal rotation while maintaining linear polarization which allows higher isolation to be achieved.
Optical Isolator AF3-4C
Specifications |
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|---|---|
| Wavelength: | 450 nm |
| Bandwidth: | 60 nm |
| Power: | -- W |
| Isolation Range: | 28-30dB |
| Transmission: | 85 % |
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Frequently Asked Questions
The Faraday isolator is made up of three parts: an input polarizer, a Faraday rotator, and an output polarizer. Light traveling in the forward direction is polarized by the input polarizer, rotated 45 degrees to the right by the Faraday rotator, and allowed to escape by the output polarizer. Light traveling in the backward direction is polarized by the output polarizer, rotated an additional 45 degrees to the right by the Faraday rotator, and blocked by the input polarizer.
An optical isolator is an optical component that allows the transmission of polarized light in only one direction.
Faraday isolators can provide non-reciprocal rotation while maintaining linear polarization, which allows for higher isolation to be achieved.
Optical isolators are typically used to prevent unwanted feedback into an optical oscillator, such as a laser cavity.
The AF3-4C model has a tuning range of 390 to 450, isolation of 28-30dB, and transmission of 85%.