Ultrafast heterodyne optical sampling applied to picosecond ultrasonics and nanoscale heat transfer

Eric Mottay; Pierre Rigail; Christophe Pierre; Sebastien Ermeneux; Jean-Michel Rampnoux; Stefan Dilhaire

doi:10.1117/12.807797

24 February 2009 Ultrafast heterodyne optical sampling applied to picosecond ultrasonics and nanoscale heat transfer

Eric Mottay, Pierre Rigail, Christophe Pierre, Sebastien Ermeneux, Jean-Michel Rampnoux, Stefan Dilhaire

Proceedings Volume 7203, Commercial and Biomedical Applications of Ultrafast Lasers IX; 72030V (2009) https://doi.org/10.1117/12.807797
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

Pump-probe techniques are widely used to measure events on time scales much shorter than the resolution of electronic detectors, and are applied in such diverse fields as ultrafast spectroscopy, photo-acoustics, TeraHertz imaging, etc. In ultrafast photoacoustics measurements for instance, a pump beam launches in the sample acoustic waves, which are detected by a second, temporally shifted probe beam. Typical detection methods rely on very small changes in the reflection coefficient of the sample surface, requiring an averaging of the signal to improve the signal to noise ratio. Traditional pump-probe methods use a mechanical delay line to shift the two pulses in the time domain, where each measurement point corresponds to a single mechanical position of the delay line. Although very efficient for small measurement ranges, extending this method in the hundreds of picoseconds or nanosecond lead to a very long acquisition time, and unpractical length for the delay line. We present a new, compact detection system, using a compact dual-oscillator ultrafast laser system, specifically designed for pump-probe measurements over time scales as long 20 ns, with a sub-picosecond resolution. This system does not use any mechanical delay line, and allows for extremely fast acquisition time.

Citation Download Citation

Eric Mottay, Pierre Rigail, Christophe Pierre, Sebastien Ermeneux, Jean-Michel Rampnoux, and Stefan Dilhaire "Ultrafast heterodyne optical sampling applied to picosecond ultrasonics and nanoscale heat transfer", Proc. SPIE 7203, Commercial and Biomedical Applications of Ultrafast Lasers IX, 72030V (24 February 2009); https://doi.org/10.1117/12.807797

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