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13 August 2019 Fundamental properties of broadband dual-contact diffractive optical elements
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We highlight fundamental properties of the dual-contact diffractive optical elements (DOEs) with high-diffraction efficiency throughout the visible spectrum and its fabrication example. To obtain high-diffraction efficiency over the broad wavelength range, the refractive index difference between the two kinds of materials constituting the dual-contact DOE must satisfy the constraint condition (blazing condition) on the wavelength dependence. For this reason, it has been considered difficult to obtain a suitable material for the dual-contact DOE. In recent years, nanocomposite materials have been studied as constituting materials of dual-contact DOE. We find the combination consisting of two kinds of UV curable resins that almost satisfy the blazing condition and have excellent processability. Prototyped dual-contact DOE using those materials showed high-diffraction efficiency and low-noise level throughout the visible spectrum.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$28.00 © 2019 SPIE
Toru Nakamura, Kenzaburo Suzuki, Yosuke Inokuchi, and Shiho Nishimura "Fundamental properties of broadband dual-contact diffractive optical elements," Optical Engineering 58(8), 085103 (13 August 2019).
Received: 1 March 2019; Accepted: 3 July 2019; Published: 13 August 2019

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