Holographic optical element

A holographic optical element (HOE) is an optical element (such as a lens, filter, beam splitter, or diffraction grating) that is produced using holographic imaging processes or principles.[1] Dichromated gelatin and photoresists are among the holographic recording materials used in forming holographic optical elements.[2][1][note 1]

Holographic optical elements are commonly used in optoelectronics applications such as laser diodes for optical disc drive heads.[1] They have been used in atomic force microscopy (AFM) pickup heads,[3] and were used in the HARLIE (Holographic Airborne Rotating Lidar Instrument Experiment) scanning atmospheric backscatter LIDAR system by NASA.[4]

One use of a holographic optical element is in thin-profile combiner lenses for optical head-mounted displays.[5] A reflective volume hologram is used to extract progressively a collimated image that was directed via total internal reflection in an optical waveguide. The spectral and angular Bragg selectivity of the reflective volume hologram makes it particularly well-suited for a combiner using such light sources as RGB LEDs, providing both good see-through quality and good quality of the projected image. This usage has been implemented in smart glasses by Konica Minolta and Sony.[6][7]

Notes

  1. ↑ See also: diffraction grating § fabrication, holographic grating

References

  1. ↑ 1.0 1.1 1.2 Čech, Jiří (2002). "Holographic Optical Elements". Tvorba difrakčních mikrooptických prvků v tenkých vrstvách amorfních chalkogenidů [Forming of diffractive microoptical elements in amorphous chalcogenide thin films] (Thesis) (in Czech). University of Pardubice. http://hdl.handle.net/10195/22940. Retrieved 10 August 2011.
  2. ↑ Gentry, Bruce. "Holographic Optical Elements". HARLIE. NASA. Archived from the original on 15 February 2013. Retrieved 9 August 2011.
  3. ↑ Bo-Jing Juang; Kuang-Yuh Huang; Hsien-Shun Liao; Kuok-Chan Leong; Ing-Shouh Hwang (2010), "AFM pickup head with holographic optical element (HOE)", Proceedings of the 2010 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, Montreal: Institute of Electrical and Electronics Engineers, pp. 442–446, doi:10.1109/AIM.2010.5695758, ISBN 978-1-4244-8031-9, Inspec Accession Number: 4764203
  4. ↑ Gentry, Bruce. "HARLIE WebPage". Goddard Space Flight Center. Archived from the original on 15 February 2013. Retrieved 10 August 2011.
  5. ↑ Kress, Bernard (2013), "Diffractive and holographic optics as combiners in Head Mounted Displays." (PDF), The 17th International Symposium on Wearable Computers, Zürich: Google, pp. 37–49, retrieved 25 January 2015
  6. ↑ Kress, Bernard; Meimei Shin (2013), "Diffractive and Holographic Optics as Optical Combiners in Head Mounted Displays" (PDF), Adjunct Publication of the 2013 ACM Conference on Ubiquitous Computing, Zürich: Association for Computing Machinery, pp. 1479–1482, ISBN 978-1-4503-2215-7, retrieved 24 January 2015
  7. ↑ Kress, Bernard; Starner, Thad (29 April 2013), Kazemi, Alex; Kress, Bernard; Thibault, Simon, eds., "A review of head-mounted displays (HMD) technologies and applications for consumer electronics", Proceedings of SPIE (Baltimore: SPIE, published 31 May 2013), 8720, Photonic Applications for Aerospace, Commercial, and Harsh Environments IV, doi:10.1117/12.2015654, ISBN 978-0-8194-9511-2, ISSN 0277-786X, 87200A, retrieved 24 January 2015

External links