638 nm Wave Rotator Plate 90°
A cost-effective alternative to a polarization half wave plate, this product rotates the axis of polarization by a half wave or ninety degrees near the 638 nm wavelength. It is often used together with a PBS cube to combine two collimated beams at the same wavelength, allowing the power to be scaled without changing the beam’s optical properties.
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Availability date: 03-08-2018
Manufacturer: Opt Lasers
About the 638 nm Wave Rotator Plate 90°
- Cost-effective and easier to align alternative to traditional polarization half wave retarders (λ/2 wave plates)
- Can be used with a PBS cube for polarization combining
- V-AR coating allows transmission > 99% (typ.) around 638 nm
Half wave polarization rotators function by rotating the polarization axis of the linearly polarized beam of light by 90 degrees (lambda/2) near the design wavelength.
Polarization rotator plates are an excellent and far lower-cost alternative to a waveplate retarder. However, unlike traditional half waveplate retarders, the rotation of the polarization is independent of the angle of the optic about the z-axis (light propagation axis). This makes alignment much simpler compared to working with a half waveplate retarder.
Our half-wave polarization rotators commonly used to combine beams in conjunction with a polarizing beamsplitter (PBS) cube for 638 nm. This is a cost-effective means to effectively double the power in an optical system without an increase in beam size or beam divergence resulting in a loss of etendue.
Although the design wavelength is 638 nm, this product may be used in the range of 620 – 660 nm with minimal loss of efficiency. This polarization rotator plate has dimensions of 10 x 10 mm with a nominal thickness of 5 mm, making it suitable for large or multiple beams adjoined by “knife edging”.
Opt Lasers also offers half-wave polarization rotator plates for wavelengths near 455 nm and 525 nm, as well as PBS cubes at the 455 nm, 525 nm, and 638 nm wavelengths.