Phase transformation and nanograting structure on TiO2 rutile single crystal induced by infrared femtosecond laser

• 来源期刊: 中国物理B（英文版）
• 关键词: infrared femtosecond laser titanium dioxide single crystal phase transformation,micro-Raman spectroscopy
• 年，卷（期）: 2007,（11）
• 页码范围: 3328-3331
• 页数: 4页
• 语种: 英文

摘要

In this paper, Titanium dioxide (TiO2) rutile single crystal was irradiated by infrared femtosecond laser pulses with repetition rate of 250 kHz. For a P-polarized femtosecond laser, the periodic nanograting structure on the ablation crater surface was formed. The periodicity is much less than the laser wavelength. The direction of nanograting alignment depends on the polarization laser beam. Micro-Raman spectra show that the intensity of Eg Raman vibrating mode of rutile phase increases and that of Alg Raman vibrating mode decreases apparently within the ablation crater. With the increase of irradiation time and laser average power, the Raman vibrating modes of anatase phase emerged. Rutile phase of TiO2 single crystal is partly transformed into anatase phase.