AF. Optical Faraday Rotators and Isolators
- AFR in part number means Faraday rotator (supplied without polarizers), AFI means Faraday isolator (supplied with polarizers), PI means polarization-independent isolator (with polarizers)
- Damage threshold (typical): AFI isolators: 1 J/cm^2 at 10 ns; AFR rotators: 5 J/cm^2 at 10 ns; some isolator models are available in TFP version and 5 J/cm^2 at 10 ns DT, please enquire;
- Optical power: TGG rods have higher average power threshold than Glass rods (we recommend using TGG for beams with average power roughly >10 W/cm^2);
- Isolation ratio in case of a rotator shows achievable isolation ratio with the use of properly chosen external polarizers.
Basic models of rotators and isolators are specified below, please enquire for custom specs:
Central wavelength, nm | Clear aperture, mm1) | Part number | Rod material | Peak Isolation, dB2) | Bandwidth (at >30 dB), nm |
Tpeak, % | LxWxH (beam height), mm |
1250 | 4 | 5AFR-1250C | TGG | 35 | ±5 | 98 | 65x71x77 (42) |
5AFI-1250C | 90 | 90x71x77 (42) | |||||
1030-1070, fixed 3) |
2 | 2AFR-1064C | TGG | 35 | ±10 | 98 | 50x38x46 (26) |
2AFI-1064C | 93 | 78x38x46 (26) | |||||
4 | 4AFR-1064C | 35 | ±10 | 98 | 52x45x51 (28.5) | ||
4AFI-1064C | 93 | 85x45x51 (28.5) | |||||
6 | 6AFR-1064C | 35 | ±10 | 98 | 55x50x56 (31) | ||
6AFI-1064C | 93 | 92x50x56 (31) | |||||
8 | 8AFR-1064C | 35 | ±10 | 98 | 62x59x65 (35.5) | ||
8AFI-1064C | 93 | 100x59x65 (35.5) | |||||
10 | 10AFR-1064C | 35 | ±10 | 98 | 65x66x72 (39) | ||
10AFI-1064C | 93 | 110x66x72 (39) | |||||
12 | 12AFR-1064C | 35 | ±10 | 98 | 70x71x77 (41.5) | ||
12AFI-1064C | 93 | 250x71x77 (41.5) | |||||
15 | 15AFR-1064C | 35 | ±10 | 98 | 85x84x90 (48) | ||
15AFI-1064C | 93 | 255x84x90 (48) | |||||
700-900, fixed 3) |
2 | 2AFR-800C, G | TGG (C) or Glass (G) | 35 | ±10 | 98 | 50x38x46 (26) |
2AFI-800C, G | 90 | 78x38x46 (26) | |||||
4 | 4AFR-800C | 35 | ±10 | 98 | 52x45x51 (28.5) | ||
4AFI-800C | 90 | 85x45x51 (28.5) | |||||
6 | 6AFR-800C, G | 35 | ±10 | 98 | 52x48x54 (30) | ||
6AFI-800C, G | 90 | 88x48x54 (30) | |||||
8 | 8AFR-800C, G | 35 | ±10 | 98 | 62x59x65 (35.5) | ||
8AFI-800C, G | 90 | 100x59x65 (35.5) | |||||
10 | 10AFR-800C, G | 35 | ±10 | 98 | 65x66x72 (39) | ||
10AFI-800C, G | 90 | 110x66x72 (39) | |||||
12 | 12AFR-800C, G | 35 | ±10 | 98 | 70x71x77 (41.5) | ||
12AFI-800C, G | 90 | 250x71x77 (41.5) | |||||
15 | 15AFR-800C, G | 35 | ±10 | 98 | 85x84x90 (48) | ||
15AFI-800C, G | 90 | 255x84x90 (48) | |||||
633 | 3 | 3AFR-633G | Glass | 35 | ±10 | 98 | 50x38x46 (26) |
3AFI-633G | 85 | 85x38x46 (26) | |||||
4 | 4AFR-633С | TGG | 35 | ±10 | 98 | 52x45x51 (28.5) | |
4AFI-633С | 85 | 85x45x51 (28.5) | |||||
5 | 5AFR-633G | Glass | 35 | ±10 | 98 | 52x48x54 (30) | |
5AFI-633G | 85 | 90x48x54 (30) | |||||
532 | 3 | 3AFR-532С | TGG | 35 | ±10 | 97 | 30x38x46 (26) |
3AFI-532С | 85 | 75x38x46 (26) | |||||
5 | 5AFR-532С | 35 | ±10 | 97 | 30x48x54 (30) | ||
5AFI-532С | 85 | 90x48x54 (30) | |||||
8 | 8AFR-532С | 35 | ±10 | 97 | 42x59x65 (35.5) | ||
8AFI-532С | 85 | 100x59x65 (35.5) | |||||
10 | 10AFR-532С | 35 | ±10 | 97 | 45x66x72 (39) | ||
10AFI-532С | 85 | 110x66x72 (39) | |||||
400 | 4 | 4AFR-400С | TGG | 35 | ±5 | 85 | 30x45x51 (28.5) |
4AFI-400С | 75 | 60x45x51 (28.5) | |||||
6 | 6AFR-400С | 35 | ±5 | 85 | 30x48x54 (30) | ||
6AFI-400С | 75 | 70x48x54 (30) |
Notes:
1) typical apertures, other apertures are available upon request;
2) >60 dB double-stage optical isolators are available upon request;
3) broadband or tunable version are available upon request.
A Faraday isolator (FI) is a nonreciprocal optical device which transmits the linearly polarized light in one direction and deflects the backward beam. It usually consists of a Faraday rotator and two polarizers. The Faraday rotator is made of magneto-optical active material which is placed into the permanent magnet system (Nd-Fe-B).
Two types of the magneto-optical active materials are available: Terbium-doped glass, Terbium-Gallium-Garnet (TGG) crystals.
The isolator protects a laser source by attenuating the reflected and backscattered light by several orders of magnitude (10^4 to 10^6). It is also used when some devices have extreme sensitivity to optical feedback which can cause intensity instabilities, frequency pulling and other undesirable effects. A Faraday isolator is also indispensable in CPA (chirped-pulse amplificaiton) laser layouts, where seed oscillator and its pump may get damaged easily by occasional back reflections.
-TFP: thin-film polarizer modifications are available for some popular laser wavelengths (like 800, 1030, 1064 nm) having higher laser-induced damage threshold of 5 J/cm^2 at 10 ns;
-60dB: double-crystal (two-stage, double stage) optical Faraday isolator units with up to 60 dB isolation ratio are available on custom basis;
-HT: some of the isolator models may be modified to have transmission as high as 92% with a swap of one of the Glan prism polarizers for a Rochon prism, however, this also brings the angle of the rejected beam closer to the main beam path.
- Available wavelength range for customized models: 400 nm to 1250 nm.
- AFR in part number means Faraday rotator (supplied without polarizers), AFI means Faraday isolator (supplied with polarizers), PI means polarization-independent isolator (with polarizers)
- Damage threshold (typical): AFI isolators: 1 J/cm^2 at 10 ns; AFR rotators: 5 J/cm^2 at 10 ns; some isolator models are available in TFP version and 5 J/cm^2 at 10 ns DT, please enquire;
- Optical power: TGG rods have higher average power threshold than Glass rods (we recommend using TGG for beams with average power roughly >10 W/cm^2);
- Isolation ratio in case of a rotator shows achievable isolation ratio with the use of properly chosen external polarizers.
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