Space variant waveplate for flat-top conversion is beam shaping optics. Combination of a space-variant waveplate and a polarizer acts as a space-variant transmission filter that converts Gaussian beam spot profile to flat-top beam with equal energy distribution.
Fabrication of Flat Top is based on the inscription of self-organized nanograting’s inside fused silica glass using a femtosecond laser. The inscription inside the glass sets a new standard for precision and performance.
Main features
Converts Gaussian beam to a flat-top beam.
High damage threshold: 63,4 J/cm2 @1064 nm, 10ns and 2,2 J/cm2 @1030 nm, 212fs.
Wavelength range from 300 nm to 2 μm.
Conversion efficiency up to 70 % (wavelength dependent)
Large aperture (up to 15 mm; standard is 6 mm)
100% suitable for your application – designed according to your laser beam specifications.
Detailed Flat Top description
Space variant waveplate for flat-top conversion is beam shaping optics. A combination of a space-variant waveplate and a polarizer acts as a space-variant transmission filter that converts the Gaussian beam spot profile to a flat-top beam with equal energy distribution.
It is a space-variant phase retardation plate inscribed inside a bulk of fused silica glass by femtosecond laser pulses. A well-known fact is that flat-top intensity distributions have noticeable advantages in micromachining in terms of efficiency and quality compared to Gaussian beam profiles.
A converter enables on-the-fly adjustment of the beam shape from flat-top to a shape with a dip in the middle. The converter paired with a polarizer filters out the input beam to generate a beam with Super-Gaussian intensity distribution. The Super-Gausian intensity profile can be adjusted for the best performance according to specific needs.
The converter is compatible with high-power ultrashort lasers.
High-power, nanosecond-pulse Q-switch laser technology with Flattop beam-shaping technique for efficient industrial laser processing
References
Ernestas Nacius, Orestas Ulčinas, Sergej Orlov, Vytautas Jukna, “Polarization singularities for shaping of vector flat-top beams in utilization for high-power laser micromachining of various materials”, Optics & Laser Technology, Volume 177, 2024, 111133, ISSN 0030-3992, https://doi.org/10.1016/j.optlastec.2024.111133.
Gertus, A. Michailovas, K. Michailovas, V. Petrauskienė, “Laser beam shape converter using spatially variable waveplate made by nanogratings inscription in fused silica”, SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 93431S (March 3, 2015). doi:10.1117/12.2075869
Michailovas, J. Adamonis, A. Aleknavicius, S. Balickas, T. Gertus, A. Zaukevičius, K. Michailovas, and V. Petrauskiene, “A New Beam Shaping Technique Implemented In 150 W 1kHz Repetition Rate Picosecond Pulse Amplifier”, OSA Technical Digest (online) (Optical Society of America), paper JTu5A.40A, (2016). doi:10.1364/CLEO_AT.2016.JTu5A.40
Adamonis, A. Aleknavičius, K. Michailovas, S. Balickas, V. Petrauskienė, T. Gertus, and A. Michailovas, “Implementation of a SVWP-based laser beam shaping technique for generation of 100-mJ-level picosecond pulses”, Applied Optics, Vol. 55, Issue 28, pp. 8007-8015, (2016). doi:10.1364/AO.55.008007
Homburg, O., & Mitra, T. (2012). Gaussian-to-top-hat beam shaping: an overview of parameters, methods, and applications. Laser Resonators, Microresonators, and Beam Control XIV. doi:10.1117/12.907914
Shipping
All items listed on the website are custom-made after we receive your order and payment. The fabrication process typically takes 2 to 4 weeks, depending on the specific item ordered. If you choose the AR coating option, an additional 2 weeks will be added to the delivery timeframe. The final delivery date will be provided in the quotation.
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