Blocks the return path of an optical beam
Optical isolators are a combination of a linear polarizer and a Quartz quarter wave retardation plate. Incident light is linearly polarized by the polarizer and converted to circular polarization by the quarter waveplate. If any portion of the emerging beam is reflected back into the isolator, the quarter wave plate produces a beam, which is linearly polarized perpendicular to the input beam. This beam is blocked by the linear polarizer and not returned to the input side of the system. These optical isolators are manufactured using a polarizing cube beamsplitter and a Quartz quarter wave plate. They are anti-reflection coated for the wavelength of interest.
| Material: | BK7A and Quartz |
| Surface Quality: | <20/10 |
| Transmitted Wavefront: | < λ / 4 @ 633 nm |
| Diameter Tolerance: | < + 0.00 / – 0.20 mm |
| Thickness: | t ˜ 2.0 mm |
| Clear Aperture: | > 85% of diameter |
| Beam Deviation: | < 3 arc min |
| Damage Threshold: | CW : > 500 W / cm² Pulsed: > 1 J / cm² |
Optical Isolators (OI)
| Dimension | 10mm dia, 0.5" dia, 20mm dia, 1.0" dia |
|---|---|
| Material | BK7A + Crystal Quart |
| Wavelength | 442 nm, 488 nm, 515 nm, 527 nm, 532 nm, 633 nm, 670 nm, 680 nm, 694 nm, 780 nm, 830 nm, 905 nm, 1047 nm, 1053 nm, 1064 nm, 1310 nm, 1319 nm, 1540 nm, 1550 nm |
Bi-Refringent Filters (BIR) 
