Indium iodide single crystal: breakthrough material for infrared acousto-optics

Area of Science:

• Materials Science
• Optics
• Solid State Physics

Background:

• Acousto-optic devices are crucial for controlling light in various spectral ranges.
• Developing new materials with superior acousto-optic properties is essential for advancing device performance.
• Indium iodide (InI) is an orthorhombic crystal with potential for optical applications.

Purpose of the Study:

• To characterize the refractive indices of single-crystal indium iodide.
• To determine the longitudinal acousto-optic figures of merit for InI.
• To evaluate the potential of InI for infrared acousto-optic devices.

Main Methods:

• Measurements of refractive indices using standard optical techniques.
• Determination of acousto-optic figures of merit (M2) via established methods.
• Analysis of optical anisotropy (Δn) and transparency range.

Main Results:

• High acousto-optic figure of merit (M2 up to 1100×10⁻¹⁵ s³kg⁻¹).
• Significant optical anisotropy (Δn = 0.47).
• Wide transparency range from 0.62 to 51 µm.

Conclusions:

• Indium iodide demonstrates excellent acousto-optic characteristics.
• Its properties are highly suitable for high-performance middle and far-infrared acousto-optic devices.
• InI shows promise as a superior alternative to existing materials for these applications.