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- W2052584614 abstract "In this paper, we explore laser direct-write photolithography and ablation processes to finely pattern polymer resists, enabling the creation of densely patterned circuit substrates. The exposure dynamics are first modeled followed by presentation of data. For the exposure experiments, a tripled-YAG ultraviolet (UV) laser drilling system with highly attenuated output was used to directly expose a photodefinable resist followed by chemical developing. To improve the exposure process, special beam-shaping optics were utilized which convert the normal Gaussian beam output to a top hat flat exposure, ideal for even exposure of the photoresist across the beam aperture. To further improve the exposure process, a square-shaped aperture was used to compensate for the spatial average fluence variation across the scanned imaged line. For the ablation experiments, the square-shaped beam was used at higher fluence to directly ablate the resist without subsequent developing. Laser direct patterning is presented as an alternative to mask-imaging photolithography to produce fine-line traces (50 /spl mu/m or smaller) for flex circuits, circuit boards, and other interconnect substrates." @default.
- W2052584614 created "2016-06-24" @default.
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- W2052584614 date "2005-03-31" @default.
- W2052584614 modified "2023-09-25" @default.
- W2052584614 title "Laser direct exposure of photodefinable polymer masks using shaped-beam optics" @default.
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- W2052584614 doi "https://doi.org/10.1109/polytr.2004.1402749" @default.
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