Optical isolator is a combination of a polarization Beamsplitter cube (PBS) and a quarter waveplate made of crystal quartz. Incident light is linearly polarized by PBS and converted to circular polarization by the quarter waveplate. If any portion of the emerging beam is reflected back into the isolator, the quarter waveplate will convert the reflected beam into a linearly polarized beam which is perpendicular to the input beam. This beam is then blocked by PBS and it will not return to the input side of the system.

Block optical feedback
Passive isolation of linearly polarized light
High isolation
RoHS Compliant

Specifications

Material Crystal Quartz & BK7
Dimension Tolerance ±0.2mm
Surface Quality 60/40
Clear Aperture >90%
Beam Deviation <3 arc minutes
Transmitted Wavefront Distortion λ/4@632.8nm
Isolation >20dB
Transmission Tp>95%, Ts<1%
Reflection Rs>99%, Rp<5%
AR Coating

R<0.25%@ central wavelength on all entrances
Damage Threshold

>500mJ/cm2, 20ns, 20Hz, @1064nm