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Optical Isolator 

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
MODEL NUMBER TUNING RANGE ISOLATION TRANSMISSION
AF5-6 500 to 645 37-40dB 92%

AF3-3

AF3-4C

AF4-5

350 to 390

390 to 450

425 to 500

28-30dB

28-30dB

28-30dB

85%

85%

85%

AF5-7 532 to 715 37-40dB 92%
AF6-7 644 to 780 37-40dB 92%
AF7-9 700 to 900 37-40dB 92%
AF6-9 650 to 900 37-40dB 92%
AF7-9B 790 to 980 37-40dB 92%
AF6-10 680 to 1080 37-40dB 90%
AF9-11 965 to 1135 37-40dB 92%
AF Double Grade Specify Center λ 56-60dB 88%
AF1064T 1064 56~60dB 88%
    
   

 

 

 

 

 

 

 

Faraday Optical Isolator,Aperture 2.4mm,1064nm
Faraday Optical Isolator,Aperture 6mm,1064nm
Faraday Optical Isolator,Aperture 10mm,1064nm
Polarization Dependent Free Space Isolator
1. Clear Aperture:8mm
2. Central wavelength: 1064nm
3. Working wavelength range: +/-5nm
4. Transmission:> 92% (25 )
5. Rotation angle at specified wavelength:45+/-2 degree
6. Isolation at 25 : > 33dB (25)
7. Insertion Loss: < 0.50dB
8. Input polarization (Degree): 0 degree
9. Output polarization(Degree): 45 degree
10.Operating Temperature: 20 to +30
Faraday Optical Isolator,Aperture 5mm,650nm
Faraday Optical Isolator,Aperture 2.4mm,633nm
Faraday Optical Isolator,Aperture 2.4mm,633nm
Faraday Optical Isolator,Aperture 10mm,1064nm

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