Abstract
A liquid crystal on silicon spatial light modulator (LCoS SLM) with large phase modulation has been thoroughly characterized to operate optimally with several linear phase modulation ranges (π, 2π, 3π, 4π, 6π, and 8π) for an intermediate wavelength of the visible spectrum (λG = 530 nm). For each range, the device response was also measured for two additional wavelengths at the blue and red extremes of the visible spectrum (λB = 476 nm and λR = 647 nm). Multiorder diffractive optical elements, displayed on the LCoS SLM with the appropriate phase modulation range, allowed us to deal with some widely known encoding issues of conventional first-order diffractive lenses such as undersampling and longitudinal chromatic aberration. We designed an achromatic multiorder lens and implemented it experimentally on the SLM. As a result, the residual chromatic aberration reduces to one-third that of the chromatic aberration of a conventional first-order diffractive lens.
Highlights
Diffractive optical elements (DOEs) have general advantages in comparison to their refractive counterparts such as being basically flat, thin, lightweight, and inexpensive when mass-produced.they exhibit large chromatic aberration and frequently low diffraction efficiency [1].Sweeney and Sommargren [1] and Faklis and Morris [2] simultaneously and independently introducedDOEs with multiwavelength optical path-length transitions between adjacent facets, called harmonic and multiorder diffractive lenses, respectively
We present experimental results for multiorder diffractive lenses implemented in a parallel-aligned LC on silicon (LCoS) from Holoeye that reaches up to an 8π phase modulation range in the green region of the visible spectrum
The corresponding Look-up tables (LUTs) curves were determined so that π, 2π, 3π, 4π, 5π, 6π, and 8π phase ranges were linearly reproduced by the spatial light modulator light modulator (SLM) device
Summary
Diffractive optical elements (DOEs) have general advantages in comparison to their refractive counterparts such as being basically flat, thin, lightweight, and inexpensive when mass-produced. An LCoS-SLM initially designed to operate in infrared provides unusually large phase modulation depths in the visible band range, for instance, from 6π radians in the red region to 10π radians in the blue region [6] This performance allows the display of a blazed diffractive grating with a reduced chromatic dispersion. Multiorder diffractive lenses with multiwavelength jumps at the edge of their facets permit to implement, on the LCoS device, higher optical power lenses with their focal length below the Nyquist focal length These multiorder diffractive lenses overcome the aliasing effects that encoding of common first-order diffractive lenses have. We provide the experimental results for two multiorder lenses that overcome the issue of displaying a diffractive lens of optical power beyond the Nyquist interval and an achromatic diffractive lens We compare their performances with that of a conventional, first-order diffractive lens
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