Thermal Stress-Induced Birefringence in Borate Glass Irradiated by Femtosecond Laser Pulses
DAI Ye1,2, YU Bing-Kun1,2, LU Bo1,2, QIU Jian-Rong2, YAN Xiao-Na1, JIANG Xiong-Wei2, ZHU Cong-Shan2
1Department of Physics, College of Sciences, Shanghai University, Shanghai 200444
2Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
Thermal Stress-Induced Birefringence in Borate Glass Irradiated by Femtosecond Laser Pulses
DAI Ye1,2;YU Bing-Kun1,2;LU Bo1,2;QIU Jian-Rong2;YAN Xiao-Na1;JIANG Xiong-Wei2;ZHU Cong-Shan2
1Department of Physics, College of Sciences, Shanghai University, Shanghai 200444
2Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
Abstract： Thermal stress-induced birefringence in borate glass which has been irradiated by 800-nm femtosecond laser pulses is observed under cross-polarized light. Due to the high temperature and pressure formed in the focal volume, the material at the edge of the micro-modified region is compressed between the expanding region and the unheated one, then stress emerges. Raman spectroscopy is used to investigate the stress distribution in the micro-modified region and indicates the redistributions of density and refractive index by Raman peak shift. We suggest that this technique can develop waveguide polarizers and Fresnel zone plates in integrated optics.
2005, Vol. 22 
