Laser-ultrasonic temperature mapping of an acousto-optic dispersive delay line

Thermal analysis of TeO2-based acousto-optic tunable filters for spectral imaging

“…However, the temperature located in the crystal is difficult to obtain. So far, the laser ultrasonic temperature mapping technique, laser condensation, and the thermal imaging technique have all been used to analyze the temperature distribution of devices [15][16][17]. However, the majority of these methods can only obtain the approximate temperature distribution on the crystal surface, Alternatively, obtain the integration result of the threedimensional temperature field in a certain direction.…”

Collinear Acousto-Optic Filtration With Electronically Adjustable Transmission Function

“…The second drawback is related to the fact that the AO device passband is determined by the AO interaction length that is limited by the AO crystal dimensions. But the influence of the light beam divergence [10], complicated acoustic field amplitude and phase structure [11]- [13] and the inhomogeneous temperature distribution inside the crystal increase [14]- [16] with length of the AO interaction. All the effects mentioned leads to the situation when the spectral resolution either does not increase with a further AO interaction length growth, or even decreases.…”