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. Dichromated gelatin and photoresists are among the holographic recording materials used in forming holographic optical elements.[note 1]
Holographic optical elements are commonly used in optoelectronics applications such as laser diodes for optical disc drive heads. They have been used in atomic force microscopy (AFM) pickup heads, and were used in the HARLIE (Holographic Airborne Rotating Lidar Instrument Experiment) scanning atmospheric backscatter LIDAR system by NASA.
One use of a holographic optical element is in thin-profile combiner lenses for optical head-mounted displays. 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.
- 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.
- Gentry, Bruce. "Holographic Optical Elements". HARLIE. NASA. Archived from the original on 15 February 2013. Retrieved 9 August 2011.
- 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
- Gentry, Bruce. "HARLIE WebPage". Goddard Space Flight Center. Archived from the original on 15 February 2013. Retrieved 10 August 2011.
- 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
- 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
- Kress, Bernard; Starner, Thad (29 April 2013), "A review of head-mounted displays (HMD) technologies and applications for consumer electronics" (PDF), in Kazemi, Alex; Kress, Bernard; Thibault, Simon (eds.), Proceedings of SPIE, 8720, Photonic Applications for Aerospace, Commercial, and Harsh Environments IV, Baltimore: SPIE (published 31 May 2013), doi:10.1117/12.2015654, ISBN 978-0-8194-9511-2, ISSN 0277-786X, 87200A, retrieved 24 January 2015
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