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.
The space-variant waveplate for flat-top conversion is a unique phase retardation plate crafted within a bulk of fused silica glass using femtosecond laser pulses. When it comes to micromachining, flat-top intensity distributions offer distinct advantages over traditional Gaussian beam profiles, particularly in terms of efficiency and quality.
By combining a space-variant waveplate with a polarizer, we create a space-variant transmission filter (patent pending) that can efficiently transform an initial Gaussian beam into a flat-top beam, achieving over 50% efficiency from the original laser power. What’s more, this converter allows for real-time adjustments, enabling users to switch between a flat-top profile and one with a dip in the middle. It’s fully compatible with high-power ultrashort lasers, making it a versatile tool for advanced applications.
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| 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) | Flat-top intensity distribution after converter |
LIDT result fs regime (pdf / English)
LIDT result ns regime (pdf / English)
