Development of time-domain differential Raman for transient thermal probing of materials

• DOI: 10.1364/oe.23.010040
• Publication Date: 2015-04-10T23:38:30Z
• Authors: Shen Xu; Tianyu Wang; David Hurley; Yanan Yue; Xinwei Wang
• Keywords: Transient (computer programming)

A novel transient thermal characterization technology is developed based on the principles of optical heating and Raman probing: time-domain differential Raman. It employs a square-wave modulated laser varying duty cycle to realize controlled probing. Very well defined extension time in each measurement changes temperature evolution profile probed field at μs resolution. Using this new technique, response tipless Si cantilever investigated along length direction. physical model reconstruct spectrum considering evolution, while taking into account dependence emission. By fitting variation normalized peak intensity, wavenumber, area against time, diffusivity determined as 9.17 × 10(-5), 8.14 9.51 10(-5) m(2)/s. These results agree with reference value 8.66 m(2)/s 10% uncertainty. The provides way introduce excitation materials, probe response, measure diffusivity, all high accuracy.