Diffractive optics calibrator

Design and construction

Wenrui Cai, Ping Zhou, Chunyu Zhao, James H Burge

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Abstract. We present a new device, the diffractive optics calibrator, for measuring duty cycle and etching depth for computer-generated holograms (CGHs). The system scans the CGH with a collimated laser beam and collects the far-field diffraction pattern with a CCD array. The relative intensities of the various orders of diffraction are used to fit the phase shift from etching and the duty cycle of the binary pattern. The system is capable of measuring variations that cause 1-nm peakto- valley (PV) phase errors in the wavefront created by the CGH. The measurements will be used primarily for quality control CGHs, but the data can also be used to provide a lookup table for corrections that allow calibration of the lithography errors. Such calibrations may be necessary for us to achieve our goal of measuring freeform aspheric surfaces with 1-nm RMS accuracy.

Original languageEnglish (US)
Article number131380P
JournalOptical Engineering
Volume52
Issue number12
DOIs
StatePublished - Dec 2013

Fingerprint

Diffractive optics
diffractive optics
Holograms
Etching
etching
Calibration
cycles
Table lookup
phase error
Wavefronts
quality control
Charge coupled devices
Phase shift
Lithography
Diffraction patterns
Laser beams
Quality control
valleys
far fields
charge coupled devices

Keywords

  • Computer-generated holograms
  • Duty cycle
  • Etching depth
  • Instrumentation
  • Quality control

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this

Diffractive optics calibrator : Design and construction. / Cai, Wenrui; Zhou, Ping; Zhao, Chunyu; Burge, James H.

In: Optical Engineering, Vol. 52, No. 12, 131380P, 12.2013.

Research output: Contribution to journalArticle

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