Visualization and measurement of parameters of acoustic surface waves in the lithium niobate crystal on a frequency of 17 MHz under thermal expansion of the sample
Laser wavelength – 354 nm, exposure time – 60 ps,
Zone size – 6 mm х 6 mm , magnification – 1.5 : 1

Measurement of acoustic surface wave (ASW) parameters on the frequency of 17 MHz
Parameters measured: ASW length – 240 µm, ASW amplitude – 3-3.5 nm

Inspection of the ASW character by comparing a surface displacement function for the same area of the sample at different moments of time.
Antinode locations do not change in time, which indicates presence of the standing wave.

The ASW visualization in the lithium niobate crystal on a frequency of 60 MHz

Laser wavelength – 354 nm, pulse length – 60 ps,
size of the recorded surface area of the object – 2.6 by 2.6 mm.

Measurement of ASW parameters on a frequency of 60 MHz

Parameters measured: ASW length – 63.5 µm; ASW amplitude – 3 -3.5 nm.
A computed wavelength with the acoustic velocity in the base surface of 4000 m/s is: 4 000 m/s : 60 MHz = 66,6 µm