Scanning ultrafast Sagnac interferometry for imaging two-dimensional surface wave propagation
Abstract
We describe an improved two-dimensional optical scanning technique combined with an ultrafast Sagnac interferometer for delayed-probe imaging of surface wave propagation. We demonstrate the operation of this system, which involves the use of a single focusing objective, by monitoring surface acoustic wave propagation on opaque substrates with picosecond temporal and micron lateral resolutions. An improvement in the lateral resolution by a factor of 3 is achieved in comparison with previous setups for similar samples.
- Publication:
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Review of Scientific Instruments
- Pub Date:
- April 2006
- DOI:
- Bibcode:
- 2006RScI...77d3713T
- Keywords:
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- 07.60.Ly;
- 42.65.Re;
- 43.35.Pt;
- 43.35.Ud;
- Interferometers;
- Ultrafast processes;
- optical pulse generation and pulse compression;
- Surface waves in solids and liquids;
- Thermoacoustics high temperature acoustics photoacoustic effect