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Photothermal microscopy for in-situ study of laser damage induced by gold inclusions

A photothermal microscope has been combined with an experimental set-up allowing damage threshold measurements at the same wavelength. The microscope is based on photothermal deflection of the transmitted probe beam: the CW pump beam (1.06 μm wavelength) and the probe beam are collinear and focused through the same objective. The diameter of the pump beam on the sample surface is 1 μm. Laser damage thresholds are measured thanks to a pulsed beam (1.06 μm wavelength and 6 nanosecond pulse) and the spatial position of the pulsed beam is controlled by a CCD camera. This experimental setup has been used to study the behavior of metallic inclusions in dielectric materials in laser damage processes. Results are presented with gold inclusions of about 600 nm in diameter in silica.