title: Wide-aperture TeO₂ AOTF at low temperatures: operation and survival.
abstract: The effect of temperature on the performance in a wide-angle paratellurite acousto-optic tunable filter (AOTF) is analyzed on the example of two different AOTF configurations. The present study is a by-product of the AOTF characterization for space-borne applications. The two AOTFs serve as dispersion elements in spectrometers for Moon and Mars space missions. The operation of the AO filters was tested in the range of -50° to+40°C; we have also demonstrated the survival of an AOTF device at -130°C. The phase matching ultrasound frequency varies with temperature within 2.5×10(-5) K(-1) and 6.6×10(-5) K(-1). We link this temperature shift to elastic characteristics of the TeO2, and demonstrate that it is mostly explained by the temperature modification of the slow acoustic wave velocity. We point out the best reference describing experimental results (Silvestrova et al., 1987). A generalization is made for all wide-angle acousto-optic tunable filters based on tellurium dioxide crystal.
authors: Space Research Institute (IKI), 84/32 Profsoyuznaya, 117997 Moscow, Russia; Faculty of Physics, Moscow State University, GSP-1, Leninskiye Gory, 119991 Moscow, Russia. Electronic address: snmantsevich@yahoo.com.
authors: S N
authors: SN
authors: Mantsevich
authors: Space Research Institute (IKI), 84/32 Profsoyuznaya, 117997 Moscow, Russia; Moscow Institute of Physics and Technology (MIPT), 9 Institutsky dr., 141700 Dolgoprudny, Moscow Region, Russia.
authors: O I
authors: OI
authors: Korablev
authors: VNIIFTRI, 141570 Mendeleevo, Moscow Region, Russia.
authors: Yu K
authors: YK
authors: Kalinnikov
authors: Space Research Institute (IKI), 84/32 Profsoyuznaya, 117997 Moscow, Russia.
authors: A Yu
authors: AY
authors: Ivanov
authors: Space Research Institute (IKI), 84/32 Profsoyuznaya, 117997 Moscow, Russia; Moscow Institute of Physics and Technology (MIPT), 9 Institutsky dr., 141700 Dolgoprudny, Moscow Region, Russia.
authors: A V
authors: AV
authors: Kiselev
keywords: Acousto-optic filer; Anisotropic diffraction; Paratellurite single crystal; Space applications; Thermal effects