Axisymmetric polarization converter SWP

Axisymmetric polarization converter
One can get azimuthal or radial polarization by inserting this element into the optical path of a normal linear polarization beam.

SWP is a waveplates segmented into 12 sections, transforming linear polarization into azimuthal or radial distribution linear polarization. It is suitable for many applications such as optical tweezers and laser processing.
Fig. 1 Fig. 2

Contents

SWP is a half-wave plate formed on a silica substrate, with 12 segments having each a different axis orientation, at 15 degrees intervals.
(⇒ Autocloning)
Each waveplate segment, as a half-wave plate, rotates the input linear polarization, in order to obtain the spatial distribution wanted.
Fig. 3

How to use

You just need a normal linearly polarized beam that is transformed into azimuthal/radial polarization.
One can switch between azimuthal and radial modes by just rotating the elements by 90 degrees.

Operating Wavelength

Operating wavelength can be selected between 355, 405, 532, 808 and 1064 nm.
If another wavelength is needed, the element can be customized to meet your needs.
( (⇒ Customization)

Clear aperture size

Standard size (diameter): Ø 7 mm. If another size is requested, the element can be customized to meet your needs.
( ⇒ Customization)
SEM surface image

Perfect boundary

There is no dead-zone at the boundary of contiguous segments, thus very few diffraction.

Easy to clean

If it is necessary to clean, the surface can be wiped (cleaned) directly.

Specifications

The customization for wavelength, retardance, and/or Size is available.
Please note that technical specifications are subject to change without notice.
SWP-355SWP-405SWP-532SWP-633SWP-808SWP-1064
Center wavelength355nm405nm532nm633nm808nm1064nm
Transmittance≥95%
Retardanceλ/2 ±λ/40
Angle of incidenceNormal incidence ±10 degrees
Clear aperture⌀7mm
Thickness of substrate1.0mm
Defect<⌀0.3mm
Holder⌀ 25.4mm

FAQ

What does SWP stand for?
“Segmented Wave Plate”
What is the specifications for the retardance?
The standard specification is λ/2±λ/40.
Is AR (Anti Reflection) coating is available?
Yes. Normally, the photonic crystal multilayers include AR coatings for the substrates and for air.
Is there AR coating at backside?
Yes.
Can I wipe the surface?
Yes. We recommend wiping with soft swabs carefully.
The hardness of the photonic crystal is as same as that of conventional optical multilayer.
What do we use to clean?
You can use acetone and ethanol. You can also use ultra-sonic cleaning machine. Or you can use a mixture of sulfuric acid (H2SO4) and hydrogen peroxide (H2O2).
What is the heatproof temperature?
It is 400° Celsius
What is the damage threshold?
10mW / 100 µm² (reference value).
How much is sensitivity to angle of incidence?
When the angle is 10 degrees from normal, the retardance error is less than 1 %.
What is the operating wavelength range?
Light having a wavelength of more than 400 nm is not lost, thus transmitted. However the value of the retardance depends on the wavelength and diverge from the value on the specifications.
Are elements with more than 12 segments available?
Yes. (⇒ Customization)
Are there any dead zones at the boundaries?
There is no dead zone at the boundary.
What happens at the center?
Ideally, the optical waves are canceled, the intensity becomes zero.