Implementation of the wide-angle acousto-optical interaction geometry in a mercury bromide single crystal

Abstract

A number of acousto-optic figures of merit and elasto-optic constants of a mercury bromide ( H g 2 B r 2 ) crystal were measured. The key characteristics of the wide-angular acousto-optic tunable filter based on a H g 2 B r 2 crystal in the ( 1 1 ¯ 0 ) plane were calculated from the measurements carried out and previously known data. It is demonstrated that the crystal makes it possible to create effective devices operating in the 5–25 µm wavelength range. In addition, we proposed the design of a filter operating in the long-wavelength infrared range of 8–12 µm, providing spectral resolution up to R = 300 and a field of view outside the crystal up to 10°. Its diffraction efficiency can reach up to 2% per 1 W of continuous driving power.

The Calibration Methods of Geometric Parameters of Crystal for Mid-Infrared Acousto-Optic Tunable Filter-Based Imaging Systems Design

“…Until now, novel structures of AOTF imaging spectrometers have been developed for the purpose of performance enhancement—for instance, to improve the resolution of the spectrum or of space [ 9 , 10 ]. Moreover, some new crystalline materials [ 11 ] have emerged in the field of AOTF devices to improve the spectral range and efficiency. The low price and high spectral resolution of AOTF indicate its potential application in the field of plasmonic sensing [ 12 ].…”

Acoustic and acousto-optic properties of Ge-=SUB=-a-=/SUB=-Se-=SUB=-b-=/SUB=-Te-=SUB=-c-=/SUB=- and Si-=SUB=-a-=/SUB=-Se-=SUB=-b-=/SUB=-Te-=SUB=-c-=/SUB=- glasses in case diffraction on longitudinal and shear acoustic waves

“…Currently many materials are considered in the literature as the basis for AO interaction in the medium and long wavelength ranges. They include a tellurium crystal [7,8], cubic crystals based on thallium halides (KRS) [9][10][11], as well as mercury-based compounds: calomel, bromide and mercuric iodide [12].…”

Growth and Temperature-Dependent Mechanical and Thermal Properties of One-Dimensional Chain Structure Hg2Br2 Crystals for Infrared Acousto-Optic Device Application

“…The Hg 2 Br 2 crystal has excellent acousto-optic properties, the M 2 value (2600 × 1.5 × 10 –18 s 3 /g) of which is about 2.5 times that of the Hg 2 Cl 2 crystal, and it has a wide transmission range (0.4–30 μm) . Moreover, the Hg 2 Br 2 crystal has a low acoustic velocity and attenuation coefficient, and the AOTF based on the Hg 2 Br 2 crystal has large separation and acceptance angle owing to the large birefringence of crystals. ,,, …”

“…12 and acceptance angle owing to the large birefringence of crystals. 6,8,13,14 Up to now, some research studies have been carried out on Hg 2 Br 2 crystal growth, property characterization, and device fabrication. As early as 1970's, Barta et mainly reported the growth of mercurous halide family crystals and the design and fabrication of acousto-optic devices.…”