Adaptive optics correction using coherently illuminated diffractive objects

Emily Finan, Tom Milster, Youngsik Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Adaptive Optics (AO) is an established technique for improving image quality and compensating for aberrations induced by focusing through samples with varying thickness and refractive index. Future optical data storage schemes with multiple data layers may require the correction capabilities of AO systems. However, the diffractive phase introduced by light reflected from optical storage media might be problematic for high-performance systems. A laser beam focused onto grooved media has a reflection with a baseball-shaped variation in the pupil, caused by the overlap in diffracted orders with the zero-order reflection. This pupil variation is significant in intensity, and simulations and experiments show that there is an associated small variation in phase. If the diffractive phase is sufficiently small, measurement of the total phase with aberrations by a wavefront sensor could enable application of AO correction with diffractive media samples. Simulations and experiments are presented to examine the capability of an adaptive optics microscope system to compensate for diffractive effects with a coherently illuminated sample. AO systems are commonly implemented with incoherent objects, but this could be extended to other applications by characterizing the performance of an AO system with a coherent reflection from a diffractive surface. Data storage media are used as targets for investigating these intensity and phase variations caused by coherence effects, with well-defined grating parameters creating diffraction patterns that are modeled and verified experimentally. There are potential applications outside of data storage, such as coherent freespace optical communication.

Original languageEnglish (US)
Title of host publicationODS 2019
Subtitle of host publicationIndustrial Optical Devices and Systems
EditorsRyuichi Katayama, Yuzuru Takashima
PublisherSPIE
ISBN (Electronic)9781510629431
DOIs
Publication statusPublished - Jan 1 2019
EventIndustrial Optical Devices and Systems Conference 2019, ODS 2019 - San Diego, United States
Duration: Aug 11 2019Aug 12 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11125
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceIndustrial Optical Devices and Systems Conference 2019, ODS 2019
CountryUnited States
CitySan Diego
Period8/11/198/12/19

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Keywords

  • Adaptive Optics
  • Coherent Illumination
  • Diffraction
  • Diffractive Samples
  • Optical Data Storage

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Finan, E., Milster, T., & Kim, Y. (2019). Adaptive optics correction using coherently illuminated diffractive objects. In R. Katayama, & Y. Takashima (Eds.), ODS 2019: Industrial Optical Devices and Systems [1112509] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11125). SPIE. https://doi.org/10.1117/12.2530045