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Home > Polarizing Optics > 14WPS - S-waveplate (Radial Polarization Converter)
radial polarization converter
Converts linear polarization to radial or azimuth
 
Can be used to create an optical vortex
 
High damage threshold
 
Nearly 100% efficiency in polarization conversion for dedicated wavelengths
 
50-90% transmission (AR coatings applicable)
 
No glued components more resistant to heat


S-waveplate is a super-structured waveplate which converts linear polarization to radial or azimuthal polarization. Radial polarization enables focusing laser beam into a smaller spot size. Radial and azimuth polarizations allow achieving the same machining properties in all directions. It is also applicable in optical tweezers and microscopy.
Primary applications for such radial polarizers are in laser machining, microscopy and optical tweezers as well as Raman spectroscopy systems. Unique features of this converter are that it is made in the volume of monolithic fused silica (UVFS) window, therefore resistant against high power laser radiation; AR coatings might be applied; and a single element is used both for polarization conversion to radial/azimuthal and generation of optical vortices.

Clear Aperture, mmWavelength, nmTransmission (uncoated)Ordering code
2488 ± 15 >40% 14WPS-40-488-2
515 ± 20 >45% 14WPS-45-515-2
632 ± 20 >50% 14WPS-50-632-2
800 ± 25 >55% 14WPS-55-800-2
1030 ± 35 >65% 14WPS-65-1030-2
1550 ± 40 >75% 14WPS-75-1550-2
4515 ± 20 >45% 14WPS-45-515-4
632 ± 20 >50% 14WPS-50-632-4
800 ± 25 >55% 14WPS-55-800-4
1030 ± 35 >65% 14WPS-65-1030-4
1550 ± 40 >75% 14WPS-75-1550-4
6 488 ± 15 >40% 14WPS-40-488-6
515 ± 20 >45% 14WPS-45-515-6
632 ± 20 >50% 14WPS-50-632-6
800 ± 25 >55% 14WPS-55-800-6
1030 ± 35 >65% 14WPS-65-1030-6
1550 ± 40 >75% 14WPS-75-1550-6
8800 ± 25 >55% 14WPS-55-800-8
1030 ± 35 >65% 14WPS-65-1030-8
 

Benefits for laser micro-machining
• Helps achieving smaller spot size
• Ensures the same machining properties in all directions*
• Complex trajectories are made featuring the same track width**
• Ensures the same cutting speed in all directions
• Increases cutting speed

* When processing materials with linearly polarized light, features are bigger in width, when machining is performed in the direction perpendicular to polarization of the beam and vice versa.
** This is useful for example in fabrication of microfluidics, whereas later chemical etching retains the same characteristics through all the channel.


Benefits for use in Optical Tw eezers
• Increases trapping force
• Might trap particles with lower refractive index comparing to surroundings


Radial polarization beam ?= 1030 nm intensity distribution
with electromagnetic field direction shown a) radial, b) azimuth

Ordering