In this paper a method is described by which the generation of harmonics of high frequency Surface Acoustic Waves is enhanced. The basic laser source employed is a mode locked Q-switched Nd-YAG laser with a fundamental pulse repetition frequency of 82MHz and a pulse envelope corresponding to approximately 30 pulses. We optically generate SAWs on a sample using a line focus. An acousto-optic cell is used to split the pump beam to produce two generating lines on the sample. It is possible to select the separation between these two beams by varying the driving frequencies on the acousto-optic cell. It is thus possible to selectively enhance and suppress the odd and even harmonic components simultaneously. Excellent agreement between the experimental results and the theory was obtained for the 82MHz and 164MHz frequency components.
|Journal||Progress in Natural Science|
|Issue number||SPEC. ISS.|
|Publication status||Published - 1 Dec 1996|
ASJC Scopus subject areas
- Materials Science(all)