500-1030 nm Wavelength Tunable Faraday Rotators and Optical Isolators
EOT’s Tornos Series Faraday Rotators rotate the plane of polarized light 45° in the forward direction and an additional 45° of non-reciprocal rotation in the reverse direction while maintaining the light’s linear polarization. When placed between crossed polarizers, a Faraday rotator becomes an optical isolator. An optical isolator provides high transmission in the forward direction and strongly attenuates any light traveling in the reverse direction, effectively protecting laser diodes from the deleterious effects of back reflections. Tornos Series optical isolators can be ordered with dichroic glass polarizers to minimize the size of the device for low power applications or they can be ordered with polarizing beam splitter cube polarizers for applications where maximum transmission is required and power levels do not permit the use of dichroic glass polarizers. By aligning the output polarizer orthogonal to the backward traveling light, isolation can be maximized within the usable wavelength range of the optical isolator.
· Eliminate frequency instability in single frequency laser diodes
· Eliminate parasitic oscillations due to ASE in amplified laser systems
· Wavelength tunability allows optimal isolation at a variety of wavelengths
· Isolators centered at 650 nm, 780 nm, 850 nm, and 980 nm can be ordered with either dichroic glass polarizers or polarizing beam splitter cube polarizers
· Optional λ/2 plate available for all isolatorsa
· Two isolators can be used in series to attain 60 dB isolation which is often required for single frequency laser diodes
|Center Wavelength (nm)||Isolation at 22 ⁰C (dB)c||Transmission at 22 ⁰C (%)d||Pulsed Damage Threshold|
|532||≥30||>97||3 J/cm2 at 10 ns|
|650||≥30||>98||3 J/cm2 at 10 ns|
|780||≥30||>98||3 J/cm2 at 10 ns|
|850||≥30||>98||3 J/cm2 at 10 ns|
|980||≥30||>98||3 J/cm2 at 10 ns|
|Center Wavelength (nm)||Spectral Range (nm)||
Isolation at 22 ⁰C (dB)e
Transmission at 22 ⁰C (%)d
|650||630-700||>30||>72.5||Dichroic Glass||25 W/cm2 CW|
|780||740-860||>30||>82||Dichroic Glass||25 W/cm2 CW|
|850||840-960||>30||>88||Dichroic Glass||25 W/cm2 CW|
|980||960-1030||>30||>90||Dichroic Glass||25 W/cm2 CW|
|532||500-600||>27||>88||PBS Cube||1 J/cm2 at 10 ns|
|650||600-680||>27||>88||PBS Cube||1 J/cm2 at 10 ns|
|780||730-830||>27||>88||PBS Cube||1 J/cm2 at 10 ns|
|850||800-880||>27||>88||PBS Cube||1 J/cm2 at 10 ns|
|980||950-1010||>27||>88||PBS Cube||1 J/cm2 at 10 ns|
a The addition of a waveplate may restrict wavelength range.
b Product specifications are subject to change.
c When placed between crossed polarizers having an extinction ratio of ≥1000:1
d At center wavelength
e When tuned for maximum isolation
f Isolators with PBS cube polarizers have CW damage threshold of 2 KW/cm2.
Note: All products are RoHS compliant.