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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 9, Iss. 5 — Apr. 29, 2014

GPC Light Shaper for speckle-free one- and two-photon contiguous pattern excitation

Andrew Bañas, Darwin Palima, Mark Villangca, Thomas Aabo, and Jesper Glückstad  »View Author Affiliations

Optics Express, Vol. 22, Issue 5, pp. 5299-5311 (2014)

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Generalized Phase Contrast (GPC) is an efficient method for generating speckle-free contiguous optical distributions useful in diverse applications such as static beam shaping, optical manipulation and recently, for excitation in two-photon optogenetics. To fully utilize typical Gaussian lasers in such applications, we analytically derive conditions for photon efficient light shaping with GPC. When combined with the conditions for optimal contrast developed in previous works, our analysis further simplifies GPC’s implementation. The results of our analysis are applied to practical illumination shapes, such as a circle and different rectangles commonly used in industrial or commercial applications. We also show simple and efficient beam shaping of arbitrary shapes geared towards biophotonics research and other contemporary applications. Optimized GPC configurations consistently give ~84% efficiency and ~3x intensity gain. Assessment of the energy savings when comparing to conventional amplitude masking show that ~93% of typical energy losses are saved with optimized GPC configurations.

© 2014 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(070.6110) Fourier optics and signal processing : Spatial filtering
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(140.3300) Lasers and laser optics : Laser beam shaping

ToC Category:
Fourier Optics and Signal Processing

Original Manuscript: January 17, 2014
Revised Manuscript: February 19, 2014
Manuscript Accepted: February 20, 2014
Published: February 27, 2014

Virtual Issues
Vol. 9, Iss. 5 Virtual Journal for Biomedical Optics

Andrew Bañas, Darwin Palima, Mark Villangca, Thomas Aabo, and Jesper Glückstad, "GPC Light Shaper for speckle-free one- and two-photon contiguous pattern excitation," Opt. Express 22, 5299-5311 (2014)

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