Measurement of the absolute Raman cross section of the optical phonons in type Ia natural diamond

a b s t r a c t The absolute Raman cross section σRS of the first-order 1332-cm − 1 optical phonons in type Ia natural diamond was measured using 785- and 1064-nm pump lasers for the excitation of Raman scattering. A small temperature-controlled blackbody was used for the signal calibration of the 785- and 1064-nm Raman systems. Measurements were made with a 0.9-mm thick (111) natural diamond sample. Values of 2.7 ± 0.6 × 10 − 29 and 0.95 ± 0.2 × 10 − 29 cm 2 per carbon atom were determined for σRS for 785- and 1064-nm excitation, respectively. The corresponding values of the Raman scattering efficiency S are 3.8 ± 0.8 × 10 − 7 and 1.3 ± 0.3 × 10 − 7 cm − 1 sr − 1 . The values of the Raman polarizability |d| for 785-, and