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Flat-Top Converter | Top Hat

Transforms Gaussian beam to a Flat-Top beam

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.

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Technical information
Application example
References
Documents
Shipping
Grouped product items
SKU Wavelength Range, mmDiameter Beam Size 1/e2, mmClear Aperture | CA, mmFlat-Top ProfileIncident PolarizationSuper-Gaussian orderSubstrate MaterialDiameter, mmThickness, mmAR Coating Price
FT-343
343 ±20
UVFS (Corning 7980)
25.4
3
€1,200.00
FT-515
515 ±20
UVFS (Corning 7980)
25.4
3
€1,200.00
FT-1030
1030 ±35
UVFS (Corning 7980)
25.4
3
€1,300.00

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.

Ө (r) =asin⁡〖(0.65∙e^((r/2.21)^2-(r/1.8876)^14 ) )∙180/π〗 

R = const

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.

Slow axis distribution
Measured Flat Top intensity distribution after converter

Technical features:

  • Material: UVFS, IRFS

  • Wavelength range: 330 – 2000 nm

  • Efficiency: depends on Super-Gauss order N

  • Clear aperture size: up to 15 mm

  • Coating (optional): AR/AR coating

  • LIDT | High damage threshold:

    • 63 J/cm² @ 1064 mn, 10 ns;

    • 2 J/cm² @ 1030 nm, 212 fs

  • Transmission (no AR coating):

    • 85% @ 343 nm, 92% @ 515 nm,

    • 94% @ 1030 nm | 99% with AR

Flat Top application examples

  • Micromachining applications

  • Laser pump shaping

High-power, nanosecond-pulse Q-switch laser technology with Flattop beam-shaping technique for efficient industrial laser processing.

  1. 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.

  2. 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 

  3. 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

  4. 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

  5. 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

ORISANDO Flat Top | Top Hat Brochure

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.