Holographic electro-optic thin film stacks for airborne hyperspectral imaging

Sameet K. Shriyan; Adam K. Fontecchio

doi:10.1117/12.860727

13 August 2010 Holographic electro-optic thin film stacks for airborne hyperspectral imaging

Sameet K. Shriyan, Adam K. Fontecchio

Proceedings Volume 7812, Imaging Spectrometry XV; 78120S (2010) https://doi.org/10.1117/12.860727
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

Abstract

In this work we demonstrate the feasibility of using a holographically formed thin film electro-optic stack for the development of an airborne hyperspectral imaging system in the visible wavelength range of 600nm to 800nm. Each wavelength filtering element in the stack is formed by photo-induced phase separation of a homogenous mixture of liquid crystals and photopolymers, exhibiting a uniform reflection efficiency of up to 80% across a 35mm optical aperture with non-normalized baseline transmission, polarization insensitivity for normal incidence and a spectral resolution of 10nm. Fast switching time on the order of microseconds and techniques to improve view angle in the individual wavelength filtering elements in the stack are discussed and the improvements are discussed from a morphological standpoint. Two techniques for stacking the thin films have been developed which requires lesser number of substrates hence improving transmission throughput and radiometric efficiency through the stack. An advantage of using such a stack is the ability to modulate each wavelength filtering element at a different frequency to obtain a spectral multiplex, thereby enabling synchronous detection and demodulation of each wavelength with a high update rate for the hyperspectral cube. A system level integration of such a stack into the prototype drive and detection unit is discussed in this work.

Citation Download Citation

Sameet K. Shriyan and Adam K. Fontecchio "Holographic electro-optic thin film stacks for airborne hyperspectral imaging", Proc. SPIE 7812, Imaging Spectrometry XV, 78120S (13 August 2010); https://doi.org/10.1117/12.860727

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available