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Tornos Series 500-1030nm Wavelength Tunable Faraday Rotators & Optical Isolators Data Sheet

Tornos Series
500-1030nm 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. 

Benefits:

· Eliminate frequency instability in single frequency laser diodes

· Eliminate parasitic oscillations due to ASE in amplified laser systems

Features:

· Wavelength tunability allows optimal isolation at a variety of wavelengths

· Isolators centered at 650nm, 780nm, 850nm, and 980nm 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 60dB isolation which is often required for single frequency laser diodes

Specificationsb:

Rotators
Center Wavelength (nm) Isolation at 22⁰C (dB)c Transmission at 22⁰C (%)d Pulsed Damage Threshold
532 ≥30 >97 3J/cm2  at 10ns
650 ≥30 >98 3J/cm2  at 10ns
780 ≥30 >98 3J/cm2  at 10ns
850 ≥30 >98 3J/cm2  at 10ns
980 ≥30 >98 3J/cm2  at 10ns
Isolators
Center Wavelength (nm) Spectral Range (nm)

Isolation at 22⁰C (dB)e

Transmission at 22⁰C (%)d

Polarizer Type

Damage Thresholdf

650 630-700 >30 >72.5 Dichroic Glass 25W/cm2 CW
780 740-860 >30 >82 Dichroic Glass 25W/cmCW
850 840-960 >30 >88 Dichroic Glass 25W/cmCW
980 960-1030 >30 >90 Dichroic Glass 25W/cmCW
532 500-600 >27 >88 PBS Cube 1J/cm2 at 10ns
650 600-680 >27 >88 PBS Cube 1J/cmat 10ns
780 730-830 >27 >88 PBS Cube 1J/cmat 10ns
850 800-880 >27 >88 PBS Cube 1J/cmat 10ns
980 950-1010 >27 >88 PBS Cube 1J/cmat 10ns

The addition of a waveplate may restrict wavelength range.
Product specifications are subject to change.
c When placed between crossed polarizers having an extinction ratio of ≥1000:1
At center wavelength
When tuned for maximum isolation
Isolators with PBS cube polarizers have CW damage threshold of 2KW/cm2.
Note: All products are RoHS compliant.