Micrograting Polymerization Fabrication with a Single Femtosecond Laser Pulse at 400 nm Wavelength
GUO Hong-Cang1, GUO Heng-Chang1, JIANG Hong-Bing1, YANG Hong, GONG Qi-Huang1, WANG Tao2, SHI Meng-Quan2, WU Fei-Peng2
1State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871
2Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100101
Micrograting Polymerization Fabrication with a Single Femtosecond Laser Pulse at 400 nm Wavelength
1State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871
2Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100101
Abstract： High diffraction efficiency refractive index-modulated holographic micrograting on a polymer thin film was obtained with a single femtosecond laser pulse interference and photo-polymerization. The diffractive efficiency of the micrograting with an He-Ne laser is up to 78% when the thickness of the film is 90μm, which corresponds to the refractive index-modulation as large as 2.4 x 10-3. The compared experiment with a femtosecond oscillator laser indicated that a single femtosecond laser pulse has the advantages in laser machining over the cw holography method such as high fabrication speed, good surface structure and high diffractive efficiency.
2003, Vol. 20 
