[13p-C301-1~12] 4.8 Strong Light Excitation Phenomena Applied to Materials and Bio Engneering

▲ [13p-C301-12] Observation of stress dynamics after fs laser irradiation inside diamond

〇Masaaki Sakakura¹, Takuro Okada², Vibhav Bharadwaj^3,4, Belen Sotillo^3,4, Shane Eaton^3,4, Roberta Ramponi^3,4, Toney Fernandez^3,4, Ali Serpenguzel⁵, Ulas Gokay⁵, Yasuhiko Shimotsuma², Kiyotaka Miura² (1.Kyoto Univ. SACI, 2.Kyoto Univ. Eng., 3.Politec. Milano, 4.IFN-CNR, 5.Koc Univ.)

Keywords:femtosecond laser processing, pump-probe, diamond

Diamond has attracted great interest as a platform for quantum information, because it has nitrogen vacancy (NV) centers, which can be exploited as quantum bits, since the electron spin at the NV center has a long coherence time and be controlled with light. Therefore, the development of fabrication technique of diamond for photonic application is an important task to realize integrated diamond-based quantum devices. One of the key components in diamond-based quantum devices is an optical waveguide, which can be written by fs laser direct writing. Previously, we found that a single-pulse irradiation with 100-300 fs laser pulses cannot induce any permanent modification inside diamond, but double-pulse irradiation with 200-400 fs laser pulses was effective to induce larger permanent modification. However, the difference in the dynamics after fs laser irradiation between single- and double-pulse irradiation has remained unclear. In this study, we observed stress dynamics using a time-resolved interferometer to investigate the difference between single- and double-pulse irradiation.