Chat with us, powered by LiveChat

Space-Variant Waveplate for Flat-Top Conversion

  • Space variant waveplate for flat-top conversion

Combination of a space-variant waveplate and a polarizer acts as a space-variant transmission filter and can be used to transform an initially Gaussian beam to a flat-top beam. /Photo: Courtesy of EKSPLA/

Category:

Space-variant waveplate for flat-top conversion is a space-variant phase retardation plate inscribed inside a bulk of fused silica glass by femtosecond laser pulses. Combination of a space-variant waveplate and a polarizer acts as a space-variant transmission filter (patent pending) and can be used to transform an initially Gaussian beam to a flat-top beam with efficiency of more than 50% of initial laser power.

Converter allows for on-the-fly adjustment of the beam shape from flat-top to a shape with a dip in the middle. Converter is compatible with high power ultrashort lasers.

Space-variant waveplate for flat-top conversion features: 
  • Conversion of Gaussian beam to a flat-top beam
  • High damage threshold
  • Conversion efficiency up to 60 % (wavelength dependent)
  • Large aperture (up to 15 mm; standard is 6 mm)
Applications:
  • Laser micromachining
  • Laser pump shaping
Space variant waveplate for flat-top conversion

Fig. 1  One-dimensional initial Gaussian function (dashed red line), 6-th order super-Gaussian function (solid red line) and calculated transmission function TX (gray solid line) /Photo: Courtesy of EKSPLA/

Space variant waveplate for flat-top conversion

Fig. 2 Flat-top intensity distribution after converter. /Photo: Courtesy of EKSPLA/

  1. T. 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 
  2. A. 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
  3. J. 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

If you are interested in our product or have questions – feel free to contact us via contact form below:

Your Name: *

Your E-Mail: *

Company Name:

Your Message: *