S-waveplate (Radial Polarization Converter)
|Coatings||Available on request|
Radial polarization enables focusing laser beam into a smaller spot size. Radially polarized beam improves processing quality, reducing the distortions affecting the edge quality of the machined structures. Moreover, radially polarized beam is more efficient at drilling and cutting high-aspect-ratio features. It is also applicable in optical tweezers, laser micromachining, STED microscopy, two-photon excitation fluorescence microscopy.
|Converts linear polarization to radial or azimuthal|
|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)|
|Large aperture possible (up to 10 mm or bigger; standard is 4 mm)|
|No glued components – more resistant to heat|
|No “ineffective center” problem|
Polymer film First Contact™ is a unique product designed for laser optics protection, preservation and cleaning. For all sorts of optical items it serves as a protection layer from damages during shipping, long term storage, environment changes, etc. and removes all dust and other contamination after the film is removed from the optical surface. It is absolutely safe for almost all types of optics and optical coatings.*
- Protects against scratching, abrasion, dirt, and water damage. Also protects against corrosion caused by water vapor, oxygen, and sulfur.
- Cleans the surface, removes particulates and organic contaminants.
- Leaves no residue.
- Leaves no hazardous waste.
- Safe to store for up to 4 years (period may be extended depending on storing conditions).
- Comes off in one piece.
- Does not lift metal from metal films.
- Safe with temperatures up to 200° C.
- Environmentally friendly
* Protective polymer cannot be used with optical components sensitive to acetate.
Price – 3 EUR per item (price includes coating service and polymer)
If you want to order protective coating please select "Optics Protection" in the catalog list.
Holding the sticker slowly peel the film starting from the edge. If necessary place the optic in its corresponding mount prior to removing the film.
Southampton University applied for patent application and appointed exclusivity in commercializing activities for Altechna R&D Ltd. Custom development of machining heads and optical assemblies incorporating the radial polarizer is possible on request.
 Rudolf Weber, Andreas Michalowski, Marwan Abdou-Ahmed, Volkher Onuseit, Volker Rominger, Martin Kraus, Thomas Graf, Effects of Radial and Tangential Polarization in Laser Material Processing, Physics Procedia, Volume 12, Part A, (2011), Pages 21-30.
 Cyril Hnatovsky, Vladlen Shvedov, Wieslaw Krolikowski, and Andrei Rode, Revealing Local Field Structure of Focused Ultrashort Pulses, Phys. Rev. Lett. 106, 123901 (2011).
 Yao Bao-Li, Yan Shao-Hui, Ye Tong and Zhao Wei, Optical Trapping of Double-Ring Radially Polarized Beam with Improved Axial Trapping Efficiency, Chinese Phys. Lett. 27 108701, (2010).
 Hong Kang, Baohua Jia, Jingliang Li, Dru Morrish, and Min Gu, Enhanced photothermal therapy assisted with gold nanorods using a radially polarized beam, Appl. Phys. Lett. 96, 063702 (2010).
 Gilad M. Lerman and Uriel Levy, Radial polarization interferometer, Opt. Express 17, 23234-23246 (2009)  Fake Lu, Wei Zheng, and Zhiwei Huang, Coherent anti-Stokes Raman scattering microscopy using tightly focused radially polarized light, Opt. Lett. 34, 1870-1872 (2009).
 Weibin Chen, Don C. Abeysinghe, Robert L. Nelson§ and Qiwen Zhan, Plasmonic Lens Made of Multiple Concentric Metallic Rings under Radially Polarized Illumination, Nano Lett., 2009, 9 (12), pp 4320–4325.
 Gilad M. Lerman and Uriel Levy, Effect of radial polarization and apodization on spot size under tight focusing conditions, Opt. Express 16, 4567-4581 (2008).
 D. W. Diehl, R. W. Schoonover, and T. D. Visser, The structure of focused, radially polarized fields, Opt. Express 14, 3030-3038 (2006).
 Tasso R. M. Sales, Smallest Focal Spot, Phys. Rev. Lett. 81, 3844–3847 (1998).
 A. V. Nesterov, V. G. Niz’ev and A. L. Sokolov , Transformation problem for radiation with radial polarization, Volume 90, Number 6 (2001).
 O J Allegre et al, Laser microprocessing of steel with radially and azimuthally polarized femtosecond vortex pulses , J. Opt. 14 085601, (2012).
 M. Kraus, M. Ahmed, A. Michalowski, A. Voss, R. Weber, and T. Graf, Microdrilling in steel using ultrashort pulsed laser beams with radial and azimuthal polarization, Opt. Express 18, 22305-22313 (2010).
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