Y-Z cut lithium niobate longitudinal piezoelectric resonant photoelastic modulator

Atalar, Okan; Yee, Steven; Arbabian, Amin

doi:10.1364/oe.476970

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…2(c). The circuit parameters are estimated using a similar technique used in the Supplementary of, 24 and are expressed in terms of the modulator dimensions and material properties in Eq. ( 2).…”

Section: Standard Photoelastic Modulatormentioning

confidence: 99%

Optically isotropic longitudinal piezoelectric resonant photoelastic modulator

Atalar,

Arbabian

2024

Photonic Instrumentation Engineering XI

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Photoelastic modulators are widely used optical instruments across many applications. Despite being in use since the 1960s, their design has remained largely unchanged. The main limitation of these modulators is the fundamental trade-off between the input aperture and the modulation frequency. These modulators typically operate around 50 kHz modulation frequency for centimeter square scale apertures. Optically isotropic and piezoelectric crystals, like gallium arsenide, gallium phosphide, zinc selenide, and zinc sulfide offer a groundbreaking opportunity to create new kinds of photoelastic modulators to overcome this trade-off. By adopting this new design, we can achieve both high modulation frequencies (in the megahertz frequency regime) and large input apertures (centimeter square scale) simultaneously.

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Section: Standard Photoelastic Modulatormentioning

confidence: 99%

Optically isotropic longitudinal piezoelectric resonant photoelastic modulator

Atalar,

Arbabian

2024

Photonic Instrumentation Engineering XI

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Optically isotropic longitudinal piezoelectric resonant photoelastic modulator for wide angle polarization modulation at megahertz frequencies

Atalar,

Arbabian

2023

J. Opt. Soc. Am. A

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Polarization modulators have a broad range of applications in optics. The acceptance angle of a free-space polarization modulator is crucial for many applications. Polarization modulators that can achieve a wide acceptance angle are constructed by attaching a piezoelectric transducer to an isotropic material, and utilizing a resonant transverse interaction between light and acoustic waves. Since their demonstration in the 1960s, the design of these modulators has essentially remained the same with minor improvements in the following decades. In this work, we show that a suitable single crystal with the correct crystal orientation, functioning as both the piezoelectric transducer and the acousto-optic interaction medium, could be used for constructing a highly efficient free-space resonant polarization modulator operating at megahertz frequencies and exhibiting a wide acceptance angle. We construct the modulator using gallium arsenide, an optically isotropic and piezoelectric crystal, and demonstrate polarization modulation at 6 MHz with an input aperture of 1 cm in diameter, acceptance angle reaching ±30∘, and modulation efficiency exceeding 50%. Compared to state-of-the-art resonant photoelastic modulators, the modulator reported in this work exhibits greater than 50-fold improvement in modulation frequency for the same input aperture, while simultaneously reducing the thickness by approximately a factor of 80. Increasing the modulation frequency of photoelastic modulators from the kilohertz to the megahertz regime and substantially reducing their thickness lead to significant performance improvements for various use cases. This technological advancement also creates opportunities for utilizing these devices in new applications.

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Polarization-insensitive wide-angle resonant acousto-optic phase modulator

Atalar,

Arbabian

2024

Opt. Lett.

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Phase modulators are commonly used devices in optics. Free-space phase modulators are typically constructed from optically anisotropic crystals exhibiting the Pockels effect. To preserve the light’s polarization state as it propagates through the crystal, it is essential to align the polarization and the angle of incidence of the light with respect to the crystal. In this study, we demonstrate the feasibility of constructing free-space resonant phase modulators with a broad acceptance angle and minimal dependence on the polarization state of light using an acousto-optic approach. These modulators operate in the megahertz frequency range, require modest power levels, have aperture sizes exceeding 1 cm2, and feature sub-millimeter thickness.

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Y-Z cut lithium niobate longitudinal piezoelectric resonant photoelastic modulator

Cited by 3 publications

References 31 publications

Optically isotropic longitudinal piezoelectric resonant photoelastic modulator

Optically isotropic longitudinal piezoelectric resonant photoelastic modulator

Optically isotropic longitudinal piezoelectric resonant photoelastic modulator for wide angle polarization modulation at megahertz frequencies

Polarization-insensitive wide-angle resonant acousto-optic phase modulator

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