Electronic f-theta correction for hologon deflector systems

Tony L. Whitman; Mehdi N. Araghi

doi:10.1117/12.28060

1 February 1991 Electronic f-theta correction for hologon deflector systems

Tony L. Whitman, Mehdi N. Araghi

Proceedings Volume 1454, Beam Deflection and Scanning Technologies; (1991) https://doi.org/10.1117/12.28060
Event: Electronic Imaging '91, 1991, San Jose, CA, United States

Abstract

Excellent performance of hologon deflectors has resulted in the design and manufacture of high-resolution laser scanning systems which utilize simple spherical optics, and have very high output accuracy. However, for flat-field systems an f-theta scan lens is needed, and cost- effective production designs force the f-theta distortion figures to 0.05% and above. Hence, for higher accuracy requirements, the residual spot placement errors must be corrected differently. In this paper, the authors describe the work undertaken to compensate for the f- theta distortion of a scan lens in a holographic deflector system used for master artwork generation. This system employs a monofacet hologon operating at the green HeNe wavelength (544 nm), produces 200 scans per second, and is capable to address >4000 dots per inch. The authors also present the results of the compensation technique which employs pixel position modulation, and reduces the 0.1% residual scan lens f-theta distortion to a level below 0.003%, as required for a <15 micrometers dot placement error at any point along the 470 mm scan field.

Citation Download Citation

Tony L. Whitman and Mehdi N. Araghi "Electronic f-theta correction for hologon deflector systems", Proc. SPIE 1454, Beam Deflection and Scanning Technologies, (1 February 1991); https://doi.org/10.1117/12.28060

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KEYWORDS

Distortion

Optical scanning systems

Sensors

Bragg cells

Calibration

Reticles

Clocks

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